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Biodiversity of aquatic ecosystems reflected by eDNA in the middle reaches of the Yangtze River after drought 认领 引用
1
作者 Chuanzhe Feng Zhijie Zhao +6 位作者 Peng Han Yulong Yang Fulei Han Fenglin Wang Pinjian Li An Xue Zhenshan Li 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第3期127-140,共14页
Extreme climate events,such as droughts,are increasingly threatening freshwater biodiversity.The middle Yangtze River,a vital biodiversity hotspot,experienced significant ecological disruption following the 2022drough... Extreme climate events,such as droughts,are increasingly threatening freshwater biodiversity.The middle Yangtze River,a vital biodiversity hotspot,experienced significant ecological disruption following the 2022drought.This study used environmental DNA(eDNA)metabarcoding to assess drought impacts on aquatic biodiversity and recovery in 2023,analyzing 22 sites across the Yangtze mainstream,Dongting and Poyang Lakes,and Shanpo Lake.The study examined species diversity across algae,fish,invertebrates,and protists,revealing distinct community compositions influenced by physicochemical variables(e.g.,dissolved oxygen,total phosphorus)and nutrient gradients(e.g.,ammonia nitrogen,nitrate nitrogen).Variation partitioning analysis(VPA)identified differential contributions of environmental factors,with physicochemical factors explaining up to 46.8%of invertebrate variation.Hydrological connectivity was critical in mitigating biodiversity loss,with connected lake-river systems supporting greater species richness and stability.Despite partial recovery,biodiversity in regions like Poyang Lake remained below pre-drought levels,highlighting long-term ecological impacts.These results emphasize the importance of hydrological connectivity and nutrient management in conserving freshwater ecosystems under climate extremes,demonstrating the utility of eDNA for biodiversity monitoring. 展开更多
关键词 Environment DNA(EDNA) Middle reaches of the Yangtze river Aquatic biodiversity Drought
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Analysis of impact mechanism of the Yangtze River Delta integration upon county-level air pollution 认领 引用
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作者 Dan Li Rongrong Fang +4 位作者 Yuhang Liu Cheng Tang Sanmang Wu Yalin Lei Jiaman Li 《Chinese Journal of Population,Resources and Environment》 CSCD 2026年第1期77-93,共17页
The Yangtze River Delta(YRD)is one of China’s most economically dense regions with the most dynamic county-level economies.The YRD’s success in addressing air pollution at the county level directly affects the ecolo... The Yangtze River Delta(YRD)is one of China’s most economically dense regions with the most dynamic county-level economies.The YRD’s success in addressing air pollution at the county level directly affects the ecological security of the Yangtze River Economic Belt.This study utilizes panel data of 151 counties in the YRD from 2003 to 2022.It regards the expansion of members of the YRD Urban Economic Coordination Council as a quasi-natural experiment.This study analyzes the influence of regional integration on county-level air pollution using the difference-in-differences approach,the synthetic difference-in-differences methodology,and spatial econometrics.Our findings indicate that:(1)regional integration can significantly reduce air pollution at the county level;(2)the environmental impact of regional integration is heterogeneous,influenced by regional differences,administrative constraints,and industrial foundations;and(3)regional integration reduces air pollution through advancing industrial structure and technological innovation,along with spatial spillover impacts.Therefore,policymakers should attach importance to air quality governance in counties,deepen regional integration strategies,optimize industrial structures,enhance technological innovation,and strengthen collaborative environmental governance to continuously promote regional sustainable development. 展开更多
关键词 Regional integration Expansion of the Yangtze River Delta County-level air pollution Difference-in-differences methodology Spatial econometrics
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Impact of Typhoon Bolaven on the Ecological Characteristics of the East China Sea and the Yangtze River Estuary 认领 引用
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作者 FANG Chen-yu ZHANG Wen-zhou +4 位作者 MA Zhan-hong ZHAO Kai ZHENG Yun-xia ZHENG Hui FEI Jian-fang 《Journal of Tropical Meteorology》 SCIE CAS CSCD 2026年第1期33-46,共14页
Typhoons are strong air–sea interactions that significantly affect the physical and biogeochemical processes of the upper ocean. Based on the Regional Ocean Modeling System-Carbon–Silicate–Nitrate Ecosystem coupled... Typhoons are strong air–sea interactions that significantly affect the physical and biogeochemical processes of the upper ocean. Based on the Regional Ocean Modeling System-Carbon–Silicate–Nitrate Ecosystem coupled model, the influence of Typhoon Bolaven(2012) on physical and ecological variables in the East China Sea and the underlying mechanisms were investigated. The results showed that the typhoon induced intense vertical mixing in the upper ocean,leading to sea surface cooling, increased salinity, nutrient concentrations, and phytoplankton blooms. Conversely, warming,reduced salinity, and decreased nutrient concentrations occurred in the subsurface layer. In the Yangtze River Estuary, the passage of typhoons effectively affected wind and current directions, shaping the dipole distribution patterns of the environmental elements. Diagnostic analysis indicated that tropical cyclone-induced horizontal advection is key in driving changes in both the physical and ecological variables within the estuary region. This study provides novel insights into the physical-ecological coupling processes and driving mechanisms governing oceanic environmental changes during typhoon events, particularly in the waters adjacent to the Yangtze River Estuary. 展开更多
关键词 typhoon ecological environment ocean response the Yangtze River Estuary
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Comprehensive Evaluation of Common Prosperity in 26 Cities of the Yangtze River Delta:An Entropy-Weighted TOPSIS Approach 认领 引用
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作者 Jiaman Hong 《Journal of Economic Insights》 2026年第1期22-36,共15页
Drawing on five core dimensions of common prosperity-development,commonality,differentiation,gradualism,and sharing-this paper constructs an index system consisting of nine indicators across three dimensions:affluence... Drawing on five core dimensions of common prosperity-development,commonality,differentiation,gradualism,and sharing-this paper constructs an index system consisting of nine indicators across three dimensions:affluence,sharing,and sustainability.Using panel data from 26 cities in the Yangtze River Delta from 2019 to 2024,the study applies the entropy-weighted TOPSIS method to systematically assess the level of common prosperity and explore potential pathways for its promotion.The results indicate a clear spatial pattern characterized by stronger performance in the eastern region and weaker performance in the western region.Economically developed cities and their surrounding areas generally exhibit higher levels of common prosperity,while relatively lagging areas are mainly located in provincial border regions and non-coastal areas. 展开更多
关键词 26 Cities of the Yangtze River Delta Common Prosperity Comprehensive Evaluation TOPSIS Entropy Weight Method Spatio-Temporal Evolution
Digital Economy's Impact on Carbon Emission Performance:Evidence from the Yangtze River Delta,China 认领 引用 被引量：4
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作者 ZHANG Xinlin QIU Fangdao LIU Jibin 《Chinese Geographical Science》 SCIE CSCD 2025年第2期217-233,共17页
Climate change caused by carbon emissions is a hot topic of concern.Enhancing carbon emission performance(CEP)emerges as a pivotal strategy to curtail carbon emissions,with the digital economy recognized as a crucial ... Climate change caused by carbon emissions is a hot topic of concern.Enhancing carbon emission performance(CEP)emerges as a pivotal strategy to curtail carbon emissions,with the digital economy recognized as a crucial instrument for bolstering CEP.Grounded in theoretical analysis,this article takes the Yangtze River Delta region(YRD)as the research object and conducts empirical analysis for the period from 2010 to 2021.The Super Epsilon-Based Measure(EBM)model was employed to assess CEP,while the entropy method was used to quantify the level of the digital economy.Baseline regression models and mediation effect models were constructed to test the research hypotheses.Additionally,the Spatial Durbin Model(SDM)was utilized to analyze the spatial spillover effects of the digital economy.Some conclusions were drawn as follows.Firstly,both the digital economy and CEP exhibit growing trends and demonstrate significant spatial distribution characteristics.Cities with high CEP are increasingly concentrated along the Yangtze River and coastal areas.Meanwhile,the digital economy generally demonstrates a spatial distribution pattern of being higher in the southeast and lower in the northwest.Secondly,the digital economy exerts a notable and consistent positive influence on CEP,but this impact is not primarily achieved through promoting green technology innovation.Instead,the digital economy exhibits a stronger intermediary effect on CEP by facilitating industrial structure upgrading and rationalization.Thirdly,the digital economy significantly enhancing local CEP but having an insignificant impact on neighboring cities'CEP.To address these findings,cities ought to invest in digital infrastructure,incentivize digital innovation through policy and financial backing,and harness advanced technologies like 5G and blockchain to promote low-carbon,intelligent production and lifestyles,while enhancing industrial structure and regional cooperation to foster a low-carbon digital economy network. 展开更多
关键词 digital economy carbon emission performance(CEP) industrial structure spatial spillover effect the Yangtze River Delta(YRD),China
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Predicting Summer Precipitation in the Middle and Lower Reaches of the Yangtze River Using Winter Sea Surface Temperature Anomalies and Trends 认领 引用
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作者 YANG Jian XING Wen LIU Fei 《Journal of Tropical Meteorology》 SCIE CSCD 2025年第1期120-132,共13页
Studying the causes of summer(June–July–August)precipitation anomalies in the middle and lower reaches of the Yangtze River(MLYR)and accurately predicting rainy season precipitation are important to society and the ... Studying the causes of summer(June–July–August)precipitation anomalies in the middle and lower reaches of the Yangtze River(MLYR)and accurately predicting rainy season precipitation are important to society and the economy.In recent years,the sea surface temperature(SST)trend factor has been used to construct regression models for summer precipitation.In this study,through correlation analysis,winter SST anomaly predictors and the winter Central Pacific SST trend predictor(CPT)are identified as closely related to the following MLYR summer precipitation(YRSP).CPT can influence YRSP by inducing anomalous circulations over the North Pacific,guiding warm and moist air northward,and inhibiting the development of the anomalous anticyclone over the Northwest Pacific.This has improved the predictive skill of the seasonal regression model for YRSP.After incorporating the CPT,the correlation coefficient of the YRSP regression model improved by 40%,increasing from 0.45 to 0.63,and the root mean squared error decreased by 22%,from 1.15 to 0.90. 展开更多
关键词 sea surface temperature anomalies sea surface temperature variation trend middle and lower reaches of the Yangtze River seasonal prediction
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Characteristics of dry-wet abrupt alternation events in the middle and lower reaches of the Yangtze River Basin and the relationship with ENSO 认领 引用 被引量：18
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作者 闪丽洁 张利平 +3 位作者 宋霁云 张艳军 佘敦先 夏军 《Journal of Geographical Sciences》 SCIE CSCD 2018年第8期1039-1058,共20页
During recent decades, more frequent flood-drought alternations have been seen in China as a result of global climate change and intensive human activities, which have sig- nificant implications on water and food secu... During recent decades, more frequent flood-drought alternations have been seen in China as a result of global climate change and intensive human activities, which have sig- nificant implications on water and food security. To better identify the characteristics of flood-drought alternations, we proposed a modified dry-wet abrupt alternation index （DWAAI） and applied the new method in the middle and lower reaches of the Yangtze River Basin （YRB-ML） to analyze the long-term spatio-temporal characteristics of dry-wet abrupt alterna- tion （DWAA） events based on the daily precipitation observations at 75 rainfall stations in summer from 1960 to 2015. We found that the DWAA events have been spreading in the study area with higher frequency and intensity since 1960. In particular, the DWAA events mainly occurred in May and June in the northwest of the YRB-ML, including Hanjiang River Basin, the middle reaches of the YRB, north of Dongting Lake and northwest of Poyang Lake. In addition, we also analyzed the impact of El Nifio Southern Oscillation （ENSO） on DWAA events in the YRB-ML. The results showed that around 41.04% of DWAA events occurred during the declining stages of La Nifia or within the subsequent 8 months after La Nina, which implies that La Nina events could be predictive signals of DWAA events. Besides, significant negative correlations have been found between the modified DWAAI values of all the rainfall stations and the sea surface temperature anomalies in the Nino3.4 region within the 6 months prior to the DWAA events, particularly for the Poyang Lake watershed and the middle reaches of the YRB. This study has significant implications on the flood and drought control and water resources management in the YRB-ML under the challenge of future climate change. 展开更多
关键词 dry-wet abrupt alternation the middle and lower reaches of the Yangtze River Basin spatio-temporalcharacteristics La Nina
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Organic Phosphorus in Shallow Lake Sediments in Middle and Lower Reaches of the Yangtze River Area in China 认领 引用 被引量：25
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作者 JIN Xiang-Can WANG Sheng-Rui +1 位作者 CHU Jian-Zhou WU Feng-Chang 《Pedosphere》 SCIE CAS 2008年第3期394-400,共7页
Thirteen sediment core samples(0-10 cm) were taken from the seven lakes in the middle and lower reaches of the Yangtze River to determine the contents and distributions of organic phosphorus(P) fractions in the sedime... Thirteen sediment core samples(0-10 cm) were taken from the seven lakes in the middle and lower reaches of the Yangtze River to determine the contents and distributions of organic phosphorus(P) fractions in the sediments of the shallow lakes in the area.The organic P fractions in the sediments were in the order of moderately labile organic P(MLOP) > moderately resistant organic P(MROP) > highly resistant organic P(HROP) > labile organic P(LOP),with average proportional ratios of 13.2:2.8:1.3:1.0.LOP,MLOP,and MROP were significantly related to the contents of total organic carbon(TOC),water-soluble P(WSP),algal-available P(AAP),NaHCO3-extractable P(Olsen-P),total P(TP),organic P(OP),and inorganic P(IP).However,HROP was significantly related to OP and weakly correlated with TOC,WSP,AAP,Olsen-P,TP or IP.This suggested that organic P,especially LOP and MLOP in sediments,deserved even greater attention than IP in regards to lake eutrophication.In terms of organic P,sediments were more hazardous than soils in lake eutrophication.Although OP concentrations were higher in moderately polluted sediment than those in heavily polluted sediment,LOP and MLOP were higher in the heavily polluted sediment,which indicated that heavily polluted sediment was more hazardous than moderately polluted sediment in lake eutrophication. 展开更多
关键词 bioavailability chemical extracted phosphorus lake sediment middle and lower reaches of the Yangtze River area organic phosphorus fractions
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Glacier retreat and its effect on stream flow in the source region of the Yangtze River 认领 引用 被引量：13
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作者 WU Shanshan YAO Zhijun +2 位作者 HUANG Heqing LIU Zhaofei CHEN Yuansheng 《Journal of Geographical Sciences》 SCIE CSCD 2013年第5期849-859,共11页
There is growing concern over the effects of climate change on glacier melt and hydrology.In this article,we used two natural small-scale basins,Tuotuo River and Buqu River in the source region of the Yangtze River,Ch... There is growing concern over the effects of climate change on glacier melt and hydrology.In this article,we used two natural small-scale basins,Tuotuo River and Buqu River in the source region of the Yangtze River,China,to show the impacts of glacier melt on stream flow.Changes in the extent of glaciers and ice volume in 1970,1992 and 2009 are evaluated using remote sensing images.Changes to the glacier surface area over the same time interval are estimated through the delineation of glacier outlines and positions using Landsat TM/ETM+imagery.By 2009,the glacier surface area had decreased by 20.83%and 34.81%of the 1970 values in Tuotuo River and Baqu River basins respectively.The total meltwater supply in each basin is estimated to be 2.56×10^9 m^3/yr and 1.24×10^9 m^3/yr respectively.Mass balance calculations show that glaciers in the study area suffered a constant mass loss of snow and ice,accumulatively approximately-24 m over the past 40 years.The annual and summer stream flow tended to increase in Tuotuo River basin from 1970 to 2009 while a negative trend of change was shown in Buqu River basin during 1970-1986.Glaciers became shorter,narrower and thinner under the effect of atmospheric warming.Streamflow increase has been recorded at Tuotuo River station in response to increased glacier and permafrost melt.However,streamflow decrease has been recorded at Yanshiping station on Buqu River,where glacier melt has lagged behind atmospheric warming.These results show a close but variable linkage among climate change,glacier melting and water resources in the source region of the Yangtze River. 展开更多
关键词 glaciers streamflow change climate change source region of the Yangtze River
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Response of water resources to climate change and its future trend in the source region of the Yangtze River 认领 引用 被引量：9
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作者 LlLin SHEN Hongyan +2 位作者 DAI Sheng LI Hongmei XIAO Jianshe 《Journal of Geographical Sciences》 SCIE CSCD 2013年第2期208-218,共11页
In this paper, variations of surface water flow and its climatic causes in China are analyzed using hydrological and meteorological observational data, as well as the impact data set （version 2.0） published by the N... In this paper, variations of surface water flow and its climatic causes in China are analyzed using hydrological and meteorological observational data, as well as the impact data set （version 2.0） published by the National Climate Center in November 2009. The results indicate that surface water resources showed an increasing trend in the source region of the Yangtze River over the past 51 years, especially after 2004. The trend was very clearly shown, and there were quasi-periods of 9 years and 22 years, where the Tibetan Plateau heating field enhanced the effect, and the plateau monsoon entered a strong period. Precipitation notably increased, and glacier melt water increased due to climate change, all of which are the main climatic causes for increases in water resources in the source region. Based on global climate model prediction, in the SRESA1B climate change scenarios, water resources are likely to increase in this region for the next 20 years. 展开更多
关键词 climate change surface water resource temperature heating field monsoon climate model thesource region of the Yangtze River
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Functional Rehabilitation of the "Soil Reservoir"in Degraded Soils to Control Floods in the Yangtze River Watershed 认领 引用 被引量：10
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作者 SHIXue-Zheng LIANGYin +3 位作者 YUDong-Sheng PANXian-Zhang E.D.WARNER WANGHong-Jie 《Pedosphere》 SCIE CAS 2004年第1期1-8,共8页
The reasons for the Yangtze River flood calamity in 1998 are briefly introduced. The authors believe that using a 'soil reservoir' concept is an important means to help control flooding of the Yangtze River.A ... The reasons for the Yangtze River flood calamity in 1998 are briefly introduced. The authors believe that using a 'soil reservoir' concept is an important means to help control flooding of the Yangtze River.A 'soil reservoir' has a large potential storage capacity and its water can be rapidly 'discharged' into the underground water in a timely fashion. The eroded, infertile soils of the Yangtze River Watershed are currently an obstacle to efficient operation of the 'soil reservoir'. The storage capacity of this 'soil reservoir'has been severely hampered due to intensive soil erosion and the formation of soil crusts. Therefore, possible measures to control floods in the Yangtze River Watershed include: rehabilitating the vegetation to preserve soil and water on the eroded infertile soils, enhancing infiltration of the different soil types, and utilizing the large 'soil reservoir' of the upper reaches of the Yangtze River. 展开更多
关键词 flood calamity soil erosion 'soil reservoir' the yangtze river watershed
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Reconstruction of typhoons in the Yangtze River Delta during 1644-1949AD based on historical chorographies 认领 引用 被引量：15
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作者 ZHANG Xiangping YE Yu FANG Xiuqi 《Journal of Geographical Sciences》 SCIE CSCD 2012年第5期810-824,共15页
The proxy records on typhoons in the Yangtze River Delta from 1644 to 1949AD were extracted from historical chorographies in the Qing Dynasty and the Republic of China Period. In reference to the basic principles for ... The proxy records on typhoons in the Yangtze River Delta from 1644 to 1949AD were extracted from historical chorographies in the Qing Dynasty and the Republic of China Period. In reference to the basic principles for identifying historical typhoons, time series on the Yangtze River Delta over a period of 306 years were developed. The conclusions are as follows. （1） There were a total of 241 typhoons from 1644 to 1949AD. Using the historical chorographies from 1884 to 1949AD, the number of typhoons was 65, equal to 87.8% re- corded by meteorological observation. The number of years with differences in typhoon ac- tivities reconstructed using two ways no more than once is 55, reaching 83.3% in the period from 1884 to 1949AD. This result means the series of historical typhoons reconstructed using historical chorographies can represent the change of typhoon activities over years. （2） The average number of typhoon activities is 0.79 times per year from 1644 to 1949AD, and they show an increasing trend. These 306 years can be divided into three periods by the average number of typhoon activities： it is low from 1644 to 1784AD, and more typhoon activities are found from 1785 to 1904AD. It is worth noting that the number of typhoon activities reaches the summit in the last period, which is 1.2 times per year from 1905 to 1949AD. （3） Before the 20th century, the number of typhoon activities in warm periods is less than the number of cold periods. However, the number of typhoon activities increased dramatically in the early 20th century. Comparing the typhoon activities with El Nifio events, the data show that the number of typhoon activities did not increase when El Nifio occurred. 展开更多
关键词 chorographies 1644-1949AD the Yangtze River Delta historical typhoon events series reconstruc-tion
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Understanding the change of land space utilization efficiency with different functions and its coupling coordination: A case study of Urban Agglomeration in the Middle Reaches of the Yangtze River, China 认领 引用 被引量：8
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作者 YANG Bin YANG Jun +1 位作者 TAN Li XIAO Jianying 《Journal of Geographical Sciences》 SCIE CSCD 2023年第2期289-310,共22页
Land spaces function in capacities of urban development,agricultural production,and ecological conservation,among many others.Research of land space utilization efficiency(LSUE)and coupling coordination relationships ... Land spaces function in capacities of urban development,agricultural production,and ecological conservation,among many others.Research of land space utilization efficiency(LSUE)and coupling coordination relationships among its subsystems are significant for sustainable land space development.In this study,taking the Urban Agglomeration in the Middle Reaches of the Yangtze River(UAMRYR)as the study area,we establish a measurement index system to evaluate the LSUE(2000–2018)and analyze its coupling coordination degree by utilizing an improved coupling coordination model.The main results include the following.(1)The average efficiency levels of urban space and agricultural space in the UAMRYR increased 2000–2018,while the average efficiency of ecological space declined.(2)The spatial pattern of the LSUE values varied greatly,with the distributions of high-efficiency and low-efficiency levels significantly different.(3)The coupling degree of LSUE includes three types,i.e.,high-level coupling,break-in,and antagonism.Each coupling degree type was characterized by change over time.(4)The proportion of areas with high coupling coordination and moderate coupling coordination increased from 2000 to 2018,while the proportion of areas with basic coupling coordination,moderate imbalance,and serious imbalance declined during this period.Given that the spatial differentiation of the LSUE and its coupling coordination,it is necessary to implement a differential land space development strategy in the UAMRYR.This study is helpful to promote the efficient utilization and coordinated development of land space utilization systems. 展开更多
关键词 land use utilization efficiency coupling coordination sustainable development Urban Agglomeration in the Middle Reaches of the Yangtze River
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Traffic accessibility and the coupling degree of ecosystem services supply and demand in the middle reaches of the Yangtze River urban agglomeration,China 认领 引用 被引量：5
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作者 CHEN Wanxu BIAN Jiaojiao +2 位作者 LIANG Jiale PAN Sipei ZENG Yuanyuan 《Journal of Geographical Sciences》 SCIE CSCD 2022年第8期1471-1492,共22页
The spatial relationships between traffic accessibility and supply and demand(S&D)of ecosystem services(ESs)are essential for the formulation of ecological compensation policies and ESs regulation.In this study,an... The spatial relationships between traffic accessibility and supply and demand(S&D)of ecosystem services(ESs)are essential for the formulation of ecological compensation policies and ESs regulation.In this study,an ESs matrix and coupling analysis method were used to assess ESs S&D based on land-use data for 2000,2010,and 2020,and spatial regression models were used to analyze the correlated impacts of traffic accessibility.The results showed that the ESs supply and balance index in the middle reaches of the Yangtze River urban agglomeration(MRYRUA)continuously decreased,while the demand index increased from 2000 to 2020.The Gini coefficients of these indices continued to increase but did not exceed the warning value(0.4).The coupling degree of ESs S&D continued to increase,and its spatial distribution patterns were similar to that of the ESs demand index,with significantly higher values in the plains than in the montane areas,contrasting with those of the ESs supply index.The results of global bivariate Moran’s I analysis showed a significant spatial dependence between traffic accessibility and the degree of coupling between ESs S&D;the spatial regression results showed that an increase in traffic accessibility promoted the coupling degree.The present results provide a new perspective on the relationship between traffic accessibility and the coupling degree of ESs S&D,representing a case study for similar future research in other regions,and a reference for policy creation based on the matching between ESs S&D in the MRYRUA. 展开更多
关键词 traffic accessibility ecosystem services supply ecosystem services demand coupling analysis spatial regression middle reaches of the Yangtze River urban agglomeration,China
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Spatio-temporal evolution and factor explanatory power analysis of urban resilience in the Yangtze River Economic Belt 认领 引用 被引量：5
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作者 Changsheng Ye Mengshan Hu +2 位作者 Lei Lu Qian Dong Moli Gu 《Geography and Sustainability》 CSCD 2022年第4期299-311,共13页
Urban resilience assesses a city’s ability to withstand unknown risks.Scholars are not comprehensive in assessing urban resilience,and they lack consideration of population resilience.This study investigated 110 pref... Urban resilience assesses a city’s ability to withstand unknown risks.Scholars are not comprehensive in assessing urban resilience,and they lack consideration of population resilience.This study investigated 110 prefecturelevel cities in the Yangtze River Economic Belt(YREB)as study areas.We calculated the YREB’s level of urban resilience based on the aspects of“economy-society-population-ecology-infrastructure”,which ensured that the comprehensive evaluation of urban resilience is complete and sufficient.The spatio-temporal evolution of urban resilience was analyzed using exploratory spatial data.Geodetectors were used to investigate the impact of several indicators,focusing on economic,social,population,ecological,and infrastructure factors,on urban resilience.The results showed that the urban resilience of the YREB has maintained a slow upward trend from 2005 to 2018,and the average urban resilience of the YREB has risen from 0.2442 to 0.2560.The resilience gap between cities in the study region increased initially and then decreased.The dominant factor in the spatial differentiation of urban resilience was the economic factors,followed by the population factors.Urban resilience has been clarified and an evaluation index system is constructed,which can provide an effective reference for the evaluation of urban resilience among countries around the world.Based on this,factors that optimize urban resilience are configured,and the regional and national sustainable development can be promoted. 展开更多
关键词 Urban resilience Spatial-temporal differentiation Geographical detector Exploratory spatial data analysis The Yangtze River Economic Belt
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State of the climate over the Three Gorges Region of the Yangtze River in 2018 认领 引用 被引量：9
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作者 ZOU Xukai CHEN Xianyan +2 位作者 ZENG Hongling CUI Tong ZHANG Qiang 《Atmospheric and Oceanic Science Letters》 CSCD 2020年第1期48-54,共7页
This report provides a summary of the climate, as well as the major weather and climate events,over the Three Gorges Region of the Yangtze River(TGR) in 2018. The annual mean temperature over the TGR in 2018 was 0.2℃... This report provides a summary of the climate, as well as the major weather and climate events,over the Three Gorges Region of the Yangtze River(TGR) in 2018. The annual mean temperature over the TGR in 2018 was 0.2℃ above normal, and precipitation was near normal. Seasonal highlights included a second warmest spring in the 58-year period of records, with abundant rainfall, which resulted in the wettest March on record. Furthermore, this was the fourth-warmest summer on record in the TGR, which contributed a higher-than-normal number of hot days in2018. Precipitation was 17% and 30% less-than-normal in winter and summer, and 40% and 6% above average in spring and autumn, respectively. The annual mean wind speed in the TGR was higher than normal, and the annual mean relative humidity was near normal. The intensity of acid rain was relatively weak, being the second-weakest year since 1999. The major meteorological disaster types in the TGR include heat waves, drought, rainstorms and flooding, freezing rain, and snow. Heat waves occurred early in the summer and persisted for long durations with strong intensities. Long-term precipitation deficits resulted in drought conditions in summer 2018 across most regions of the TGR. Frequent heavy rainfall caused urban waterlogging. The early-year and late-year cold snaps were accompanied by heavy snowfall and rain over some locations across the TGR, which had adverse impacts on transportation, agriculture, electricity, and people’s lives. 展开更多
关键词 The Three Gorges Region of the Yangtze River climate summary weather and climate events
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Vegetation Index Reconstruction and Linkage with Drought for the Source Region of the Yangtze River Based on Tree-ring Data 认领 引用 被引量：3
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作者 LI Jinjian WANG Shu +2 位作者 QIN Ningsheng LIU Xisheng JIN Liya 《Chinese Geographical Science》 SCIE CSCD 2021年第4期684-695,共12页
Variations in vegetation are closely related to climate change, but understanding of their characteristics and causes remains limited. As a typical semi-humid and semi-arid cold plateau region, it is important to unde... Variations in vegetation are closely related to climate change, but understanding of their characteristics and causes remains limited. As a typical semi-humid and semi-arid cold plateau region, it is important to understand the knowledge of long term Normalized Difference Vegetation Index(NDVI) variations and find the potential causes in the source region of the Yangtze River. Based on four tree-ring width chronologies, the regional mean NDVI for July and August spanning the period 1665–2013 was reconstructed using a regression model, and it explained 43.9% of the total variance during the period 1981–2013. In decadal, the reconstructed NDVI showed eight growth stages(1754–1764, 1766–1783, 1794–1811, 1828–1838, 1843–1855, 1862–1873, 1897–1909, and 1932–1945)and four degradation stages(1679–1698, 1726–1753, 1910–1923, and 1988–2000). And based on wavelet analysis, significant cycles of2–3 yr and 3–8 yr were identified. In additional, there was a significant positive correlation between the NDVI and the Palmer Drought Severity Index(PDSI) during the past 349 yr, and they were mainly in phase. However, according to the results of correlation analysis between different grades of drought/wet and NDVI, there was significant asymmetry in extreme drought years and extreme wet years. In extreme drought years, NDVI was positively correlated with PDSI, and in extreme wet years they were negatively correlated. 展开更多
关键词 Normalized Difference Vegetation Index(NDVI) reconstruction dendrochronology tree ring Source Region of the Yangtze River
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Simulation and prediction of multi-scenario evolution of ecological space based on FLUS model: A case study of the Yangtze River Economic Belt, China 认领 引用 被引量：13
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作者 LIU Xiaoqiong WANG Xu +1 位作者 CHEN Kunlun LI Dan 《Journal of Geographical Sciences》 SCIE CSCD 2023年第2期373-391,共19页
Building the Yangtze River Economic Belt(YREB)is one of China’s three national development policies in the new era.The ecological environment of the Yangtze River Economic Belt must be protected not only for regional... Building the Yangtze River Economic Belt(YREB)is one of China’s three national development policies in the new era.The ecological environment of the Yangtze River Economic Belt must be protected not only for regional economic development but also for regional ecological security and ecological progress in this region.This paper takes the ecological space of the Yangtze River Economic Belt as the research object,based on land use data in 2010 and 2015,and uses the FLUS model to simulate and predict the ecological space of the research area in 2035.The variation of the research area’s ecological space area and its four sub-zones has remarkable stability under diverse situations.Both the production space priority scenarios(S1)and living space priority scenarios(S2)saw a fall in ecological space area,with the former experiencing the highest reduction(a total reduction of 25,212 km2).Under the ecological space priority scenarios(S3)and comprehensive space optimization scenario(S4),the ecological space area increased,and the ecological space area expanded even more under the former scenario(a total growth of 23,648 km2).In Yunnan-Guizhou,the ecological space is relatively stable,with minimal signs of change.In Sichuan-Chongqing,the Sichuan Basin,Zoige Grassland,and Longmen Mountains were significant regions of area changes in ecological space.In the middle reaches of the Yangtze River,the ecological space changes mainly occur in the Wuyi Mountains,Mufu Mountains,and Dabie Mountains,as well as the surrounding waters of Dongting Lake.The Yangtze River Delta’s changes were mainly observed in the eastern Dabie Mountains and Jianghuai Hills. 展开更多
关键词 ecological space multi-scenario simulation prediction FLUS model Yangtze River Economic Belt extensive protection of the Yangtze River
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Three-dimensional P-wave Velocity Structure Modelling of the Middle and Lower Reaches of the Yangtze River Metallogenic Belt: Crustal Architecture and Metallogenic Implications 认领 引用 被引量：3
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作者 CHEN Anguo LÜ Qingtian +4 位作者 ZHOU Taofa DU Jianguo DING Juan YAN Jiayong LU Zhitang 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2020年第6期1808-1821,共14页
In this study,we compiled and analyzed 69310 P-wave travel-time data from 6639 earthquake events.These events(M≥2.0)occurred from 1980 s to June 2019 and were recorded at 319 seismic stations(Chinese Earthquake Netwo... In this study,we compiled and analyzed 69310 P-wave travel-time data from 6639 earthquake events.These events(M≥2.0)occurred from 1980 s to June 2019 and were recorded at 319 seismic stations(Chinese Earthquake Networks Center)in the study area.We adopted the double-difference seismic tomographic method(tomo DD)to invert the 3-D P-wave velocity structure and constrain the crust-upper mantle architecture of the Middle and Lower Reaches of the Yangtze River Metallogenic Belt(MLYB).A 1-D initial model extracted from wide-angle seismic profiles was used in the seismic tomography,which greatly reduced the inversion residual.Our results indicate that reliable velocity structure of th e uppermost mantle can be obtained when Pn is involved in the tomography.Our results show that:(1)the pattern of the uppermost mantle velocity structure corresponds well with the geological partitioning:a nearly E-W-trending low-velocity zone is present beneath the Dabie Orogen,in contrast to the mainly NE-trending low-velocity anomalies beneath the Jiangnan Orogen.They suggest the presence of thickened lower crust beneath the orogens in the study area.In contrast,the Yangtze and Cathaysia blocks are characterized by relatively high-velocity anomalies;(2)both the ultra-high-pressure(UHP)metamorphic rocks in the Dabie Orogen and the low-pressure metamorphic rocks in the Zhangbaling dome are characterized by high-velocity anomalies.The upper crust in the Dabie Orogen is characterized by a low-velocity belt,sandwiched between two high velocity zones in a horizontal direction,with discontinuous low-velocity layers in the middle crust.The keel of the Dabie Orogen is mainly preserved beneath its northern section.We infer that the lower crustal delamination may have mainly occurred in the southern Dabie Orogen,which caused the mantle upwelling responsible for the formation of the granitic magmas emplaced in the middle crust as the low-velocity layers observed there.Continuous deep-level compression likely squeezed the granitic magma upward to intrude the upper crustal UHP metamorphic rocks,forming the'sandwich'velocity structure there;(3)high-velocity updoming is widespread in the crust-mantle transition zone beneath the MLYB.From the Anqing-Guichi ore field northeastward to the Luzong,Tongling,Ningwu and Ningzhen orefields,high-velocity anomalies in the crust-mantle transition zone increase rapidly in size and are widely distributed.The updoming also exists in the crust-mantle transition zone beneath the Jiurui and Edongnan orefields,but the high-velocity anomalies are mainly stellate distributed.The updoming high-velocity zone beneath the MLYB generally extends from the crust-mantle transition zone to the middle crust,different from the velocity structure in the upper crust.The upper crust beneath the Early Cretaceous extension-related Luzong and Ningwu volcanic basins is characterized by high velocity zones,in contrast to the low velocity anomalies beneath the Late Jurassic to Early Cretaceous compression-related Tongling ore field.The MLYB may have undergone a compressive-to-extensional transition during the Yanshanian(Jurassic-Cretaceous)period,during which extensive magmatism occurred.The near mantle-crustal boundary updoming was likely caused by asthenospheric underplating at the base of the lower crust.The magmas may have ascended through major crustal faults,undergoing AFC(assimilation and fractional crystallization)processes,became emplaced in the fault-bounded basins or Paleozoic sequences,eventually forming the many Cu-Fe polymetallic deposits there. 展开更多
关键词 3D P-wave velocity structure double-difference seismic tomography crust-upper mantle Dabie Orogen Middle and Lower Reaches of the Yangtze River Metallogenic Belt
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Characteristics and runoff volume of the Yangtze River paleo-valley at Nanjing reach in the Last Glacial Maximum 认领 引用 被引量：4
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作者 CAO Guangjie WANG Jian +1 位作者 WANG Lingjun LI Yanyan 《Journal of Geographical Sciences》 SCIE 2010年第3期431-440,共10页
The stratigraphical cross-sections of the Yangtze River incised-valley near the No.l, No.3 and No.4 Nanjing Yangtze River bridges were established with respective bore date and documents. By ^14C age analysis of the s... The stratigraphical cross-sections of the Yangtze River incised-valley near the No.l, No.3 and No.4 Nanjing Yangtze River bridges were established with respective bore date and documents. By ^14C age analysis of the samples of four drilling cores near the No.4 Bridge （to be built）, we can find that the time range of paleo-valley is dated in the LGM at a depth of-60 m to -90 m near Nanjing. It is also indicated that the deep incised-valley channel was narrow and the river flowed swiftly. The ancient Yangtze River deep channel presented partially and deeply incised features near the No.1 Bridge. According to previous publications, much research has been done on the main paleo-channel of the Yangtze River, but few results have been achieved on discharge estimation. In this paper, the incipient velocity and average veIocity of the LGM was calculated with Vc=4.60d^1/3h^1/6, Vc=1.281g（ 13.15. h /d95） √gd, V≈6.5u＊｜h/d90｜^1/6 etc., in terms of the river shape, sedimentary grain size and sequences near the No.3 and No.1 bridges. Moreover, the discharge in Nanjing reach of the Yangtze River during the LGM has been estimated to be around 12,000-16,000 m^3/s according to the relationship of discharge, velocity of flow and cross-section. 展开更多
关键词 the Last Glacial Maximum Nanjing reach of the Yangtze River paleo-valley velocity of flow runoff volume
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