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Process analysis of the impacts of ship emissions on PM2.5and O3in the Yangtze River Delta,China 认领 引用 被引量：1
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作者 Xinyi Fu Xiaotong Wang +3 位作者 Dongsheng Chen Jianlei Lang Ying Zhou Xiurui Guo 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第3期372-383,共12页
Ship emissions significantly impact coastal air quality,with the Yangtze River Delta(YRD)region accounting for approximately 50%of China's total shipping emissions.Using the Community Multiscale Air Quality(CMAQ)m... Ship emissions significantly impact coastal air quality,with the Yangtze River Delta(YRD)region accounting for approximately 50%of China's total shipping emissions.Using the Community Multiscale Air Quality(CMAQ)model and process analysis(PA)tool,we quantitatively assessed how atmospheric processes(emissions,chemical reactions,transport,and deposition)contribute to PM2.5and O3,and the chemical pathways of O3formation due to ship emissions.Ship emissions significantly enhanced PM2.5concentrations(>5μg/m3)in the coastal areas of Jiangsu province and offshore regions,with diminishing inland effects.Ship-induced NO3-showed greater inland penetration compared to SO42-,which remained near the coast.In coastal cities,aerosol processes,rather than primary emissions,dominated PM2.5formation,highlighting the importance of secondary formation.O3responses varied spatially,showing coastal titration zones but inland enhancements.Process analysis revealed that vertical transport dominated O3distribution in coastal regions(5-10 ppb),whereas chemical processes showed strong negative contributions(below-10 ppb)along shipping routes.The impact exhibited pronounced diurnal variations,peaking during afternoon hours(14:00-17:00 local standard time(LST),up to 10 ppb/h)with morning titration effects(up to-7.5 ppb/h at 08:00 LST).The vertical profile analysis of shipping-related O3showed surface-level O3titration from ship NOxemissions,with impacts extending to higher layers through vertical mixing.Integrated reaction rate analysis revealed that effective O3control in shipping-influenced regions requires coordinated reduction of both NOxand VOCs.These findings provide insights for developing targeted control strategies,particularly for addressing the complex NOx-O3chemistry and secondary PM2.5formation. 展开更多
关键词 Ship emissions Process analysis PM(2.5) O3 Yangtze River Delta
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Coupling Relationships of Water-Food-Carbon Coupling System in Yangtze River Basin,China 认领 引用
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作者 ZHOU Lilei TAN Shuixian +4 位作者 GUAN Dongjie LI Mengyu WANG Caihong ZHU Xusen PENG Guochuan 《Chinese Geographical Science》 SCIE CAS CSCD 2026年第1期109-126,I0002,I0003,共18页
A greater understanding of the interactions among water,food,and carbon is needed to promote the sustainable development of the Yangtze River Basin(YRB),China.In this study,we calculated the water yield(WY),food suppl... A greater understanding of the interactions among water,food,and carbon is needed to promote the sustainable development of the Yangtze River Basin(YRB),China.In this study,we calculated the water yield(WY),food supply(FS),and carbon sequestra-tion(CS)services of the YRB in 2000,2010,and 2020 via the Integrated Valuation of Ecosystem Services and Trade-offs(InVEST)model.Then,we used the correlation coefficient and spatial clustering methods to analyse the coupling relationships among WY,FS,and CS.Finally,we identified the main factors of the water-food-carbon(WFC)coupling system via the optimal parameter geographic detector.The results showed that WY,FS,and CS in the YRB have degraded from 2010 to 2020 with reductions of-6.30%,-0.13%,and-0.31%,respectively.A notable trade-off relationship existed between FS and CS,with correlation coefficients of-0.63 in 2000,-0.62 in 2010,and-0.60 in 2020.From 2000 to 2020,the area proportion of the grassland low-service bundle decreased from 28.18% to 25.05%,whereas that of the ecologically balanced bundle increased from 23.24%to 24.85%.Distance to cropland,distance to forested land,and land use were the main driving factors for the WFC coupling system in the YRB,with explanatory power of 0.72,0.43,and 0.87 in 2010,respectively.These findings provide scientific theoretical support for achieving food security,water security,carbon neut-rality and peak carbon goals in the YRB. 展开更多
关键词 water-food-carbon(WFC) trade-offs and synergies ecosystem service bundles Yangtze River Basin(YRB),China
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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
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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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Climatic drivers of summer run-of-river hydropower generation in the middle reaches of the Yangtze River Basin:Synergistic effects of subtropical westerly jet dynamics and transregional teleconnections 认领 引用
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作者 Huixin Li Ke Huang +2 位作者 Bo Sun Leiyi Hou Botao Zhou 《Atmospheric and Oceanic Science Letters》 CAS CSCD 2026年第4期1-7,共7页
Based on ERA5 reanalysis and CN05.1 gridded observational datasets,this study investigates key meteorological drivers and cross-seasonal mechanisms influencing summer(June–July–August)run-of-river(ROR)hydropower gen... Based on ERA5 reanalysis and CN05.1 gridded observational datasets,this study investigates key meteorological drivers and cross-seasonal mechanisms influencing summer(June–July–August)run-of-river(ROR)hydropower generation in the middle reaches of the Yangtze River Basin(MYRB).Results reveal synergistic regulation by the meridional displacement of the subtropical westerly jet(SWJ)and Pakistan convective activity through East Asian atmospheric circulation.Southward(northward)SWJ shifts coupled with weakened(intensified)Pakistan convection enhance(reduce)MYRB precipitation while lowering(elevating)temperatures,thereby increasing(decreasing)ROR hydropower generation.Precursor analysis identifies spring negative(positive)sea surface temperature anomalies in the northwestern Indian Ocean may strengthen(weaken)meridional thermal gradients,forcing corresponding SWJ displacements.Concurrently,Central Asian cooling(warming)in spring modifies the Arabian Sea–Central Asia pressure gradient,suppressing(enhancing)South Asian monsoon moisture transport to Pakistan.These oceanic–terrestrial thermal coupling mechanisms demonstrate significant predictability for MYRB hydropower variability. 展开更多
关键词 Run-of-river hydropower Subtropical westerly jet Pakistan convection Oceanic–terrestrial thermal forcing Middle reaches of Yangtze river basin
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Heterogeneity Performance of Cross-border Development Under the Influence of High-speed Rail Flow and Information Flow in Yangtze River Delta Region,China 认领 引用
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作者 DUAN Wei WANG Shaobo +1 位作者 ZHOU Yutao WANG Xinyu 《Chinese Geographical Science》 SCIE CAS CSCD 2026年第3期524-540,共17页
In the knowledge economy era,the rapid flow channels represented by high-speed rail(HSR)and online information flow promote cross-border development between cities.This study constructed a conceptual model of cross-bo... In the knowledge economy era,the rapid flow channels represented by high-speed rail(HSR)and online information flow promote cross-border development between cities.This study constructed a conceptual model of cross-border development from the perspective of flow space.Taking the Yangtze River Delta Region(YRDR),China,as a case study,we apply the Speaker-listener Label Propagation Algorithm(SLPA)to detect the heterogeneity patterns of cross-border development shaped by HSR flow and information flow in 2021.Results show that cross-border development among cities is more evident under information flows compared to HSR flow.Furthermore,intra-provincial cross-border development predominates under HSR flow,whereas inter-provincial cross-border development is more frequent under in-formation flow.Additionally,information flow leads to more shared or competitive nodes in cross-border development across different communities.In the future,leveraging these nodes'intermediary role will be the key to driving the next phase of regional integration.This research will enhance and broaden the theoretical frameworks for cross-border integrated development,flow space,and regional coordinated development. 展开更多
关键词 flow space cross-border development high-speed rail(HSR)flow information flow Yangtze River Delta Region(YRDR),China
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Two Unconventional Types of Large-scale Circulation Anomalies Inducing Heavy Rainfall over the Yangtze River Basin 认领 引用
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作者 Xinyu LI Mengyao CHEN Riyu LU 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2026年第3期565-577,共13页
Summer rainfall in the Yangtze River basin(YRB)is favored by two key factors in the lower troposphere:the tropical anticyclonic anomaly over the western North Pacific and the extratropical northeasterly anomalies to t... Summer rainfall in the Yangtze River basin(YRB)is favored by two key factors in the lower troposphere:the tropical anticyclonic anomaly over the western North Pacific and the extratropical northeasterly anomalies to the north of the YRB.This study,however,found that approximately 46%of heavy rainfall events in the YRB occur when only one factor appears and the other is opposite signed.Accordingly,these heavy rainfall events can be categorized into two types:the extratropical northeasterly anomalies but tropical cyclonic anomaly(first unconventional type),and the tropical anticyclonic anomaly but extratropical southwesterly anomalies(second unconventional type).Anomalous water vapor convergence and upward motion exists for both types,but through different mechanisms.For the first type,the moisture convergence and upward motion are induced by a cyclonic anomaly over the YRB,which appears in the mid and lower troposphere and originates from the upstream region.For the second type,a mid-tropospheric cyclonic anomaly over Lake Baikal extends southward and results in southwesterly anomalies over the YRB,in conjunction with the tropical anticyclonic anomaly.The southwesterly anomalies transport water vapor to the YRB and lead to upward motion through warm advection.This study emphasizes the role of mid-tropospheric circulations in inducing heavy rainfall in the YRB. 展开更多
关键词 Yangtze River basin heavy rainfall large-scale circulation anomalies
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Governance efficiency of rural human settlement environment in the Yangtze River Economic Belt in China:Regional differences,dynamic evolution,and influencing factors 认领 引用
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作者 Wenwen Qiu Ya Zhang 《Chinese Journal of Population,Resources and Environment》 CSCD 2026年第2期268-277,共10页
Based on an index system established from the dimensions of ecology,life,and production,this study measures the governance efficiency of rural human settlements in the Yangtze River Economic Belt(YREB)using the super-... Based on an index system established from the dimensions of ecology,life,and production,this study measures the governance efficiency of rural human settlements in the Yangtze River Economic Belt(YREB)using the super-efficient slack-based measure model.The Gini coefficient,Markov chain,and Tobit regression model are employed to analyze the YREB’s regional disparities,dynamic trends,and influencing factors,providing a theoretical basis for promoting rural revitalization and regional coordination development.The results show that:(1)The overall governance efficiency exhibits a fluctuating uptrend,with a spatial pattern of“downstream>midstream>upstream”.(2)Moreover,regional differences of efficiency show a fluctuating downtrend,with inter-regional disparities as the primary sources.(3)The Markov chain indicates strong convergence in low-efficiency regions and low stability in high-efficiency regions.(4)Finally,governance efficiency can be significantly influenced by financial support,informatization,economic development,and education level.These results demonstrated the need for differentiated policies to narrow regional gaps and enhance synergistic,sustainable improvement in rural human settlements. 展开更多
关键词 Rural human settlement environment Governance efficiency Regional differences Yangtze River Economic Belt China
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Characteristics of Submicron Aerosols (PM1) in a Yangtze River Delta Megacity:Composition,Sources,and Light Absorption 认领 引用 被引量：1
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作者 Shiyue YANG Haifeng MENG +8 位作者 Ning ZHANG Shijie CUI Yuanjie SHAN Yu HUANG Yunlong XU Chongchong ZHANG Xinlei GE Mindong CHEN Junfeng WANG 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2026年第1期247-258,共12页
We conducted a field campaign to investigate the chemical composition,sources,and light absorption of submicron aerosols(PM1)from early 2022 in Nanjing,China.The average concentration of PM1 was 31μg m−3,org... We conducted a field campaign to investigate the chemical composition,sources,and light absorption of submicron aerosols(PM1)from early 2022 in Nanjing,China.The average concentration of PM1 was 31μg m−3,organics(33%)constituted the largest fraction,followed by nitrate(30%),sulfate(18%),ammonium(15%),chloride(3%),and rBC(2%).Four organic aerosol(OA)subcomponents were identified,including two primary OA(POA)and two secondary OA(SOA).The less-oxidized SOA(LO-OOA)contributes the most to the total OA mass(59%).LO-OOA is tightly correlated with the tracer ion C2H4O2+from levoglucosan,and another aged biomass-burning derived species,K3SO4+,suggesting it was likely influenced by aged biomass-burning OA.Our study also revealed that fireworks during the Spring Festival have a detrimental impact on air quality,contributing to secondary formation and accumulation under static winter meteorological conditions,prolonging the pollution duration.Also,LO-OOA was found to have the strongest light-absorbing ability.Our results highlight that the light absorption of LO-OOA can mainly be attributed to the CxHyN+ family,increased with the double-bond equivalent value.The more-oxidized SOA(MO-OOA)exhibited a negligible light absorption and was strongly correlated with daytime photochemical processes,implying a light-bleaching effect.This study enhances our understanding of the regional contribution of biomass combustion and fireworks to PM1 pollution in Nanjing,a typical megacity in the Yangtze River Delta region,during winter,aiding in the development of strategies for long-term air quality improvement in the region. 展开更多
关键词 PM1 source apportionment Yangtze River Delta Region brown carbon
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Erratum to:Seasonal prediction of extreme high-temperature days over the Yangtze River basin 认领 引用
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作者 Shifeng PAN Zhicong YIN +4 位作者 Mingkeng DUAN Tingting HAN Yi FAN Yanyan HUANG Huijun WANG 《Science China Earth Sciences》 SCIE EI CSCD 2026年第7期2800-2800,共1页
The article"Seasonal prediction of extreme high-temperature days over the Yangtze River basin"(Sci China Earth Sci,2024,67:21372147)contained errors.The corrections in an erratum do not change or affect the ... The article"Seasonal prediction of extreme high-temperature days over the Yangtze River basin"(Sci China Earth Sci,2024,67:21372147)contained errors.The corrections in an erratum do not change or affect the result or conclusion of the paper.The Fig.5 in the original paper is in error.The corrected figure and figure caption are given below. 展开更多
关键词 Yangtze River Basin corrected figure seasonal prediction figure correction erratum corrections erratum figure caption extreme high temperature days
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Quantitative analysis of water exchange between Yangtze River and Dongting Lake 认领 引用
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作者 Hai-lan Su Xin-xin Chen +3 位作者 Jun-hong Zhang Zi-wen Wang Ya-xin Guo Shuo Ouyang 《Water Science and Engineering》 EI CAS CSCD 2026年第1期56-66,共11页
The Three Gorges Reservoir(TGR)is one of the largest hydroelectric projects in the world,with significant impacts on the hydrology and ecology of the Yangtze River Basin.Understanding the effects of TGR operation on s... The Three Gorges Reservoir(TGR)is one of the largest hydroelectric projects in the world,with significant impacts on the hydrology and ecology of the Yangtze River Basin.Understanding the effects of TGR operation on surrounding water systems,especially the Jingjiang Reach and Dongting Lake,is crucial for local water resources management and flood control.This study evaluated the impact of the TGR on water diversion in the Jingjiang Reach and outflow from Dongting Lake using observed data and sedimentation patterns before and after TGR operation.A coupled one-wo-demensional hydrodynamic model was developed to simulate hydrological processes.The relationship between TGR scheduling and Dongting Lake inflow and outflow across different periods was quantified.The results indicated that after TGR operation began,riverbed erosion significantly lowered tributary water levels under equivalent main stream flow.Lake inflow through the three Jingjiang Reach outlets increased during drawdown and water supplement periods but decreased during flood and impounding periods.Lake outflow increased during drawdown,flood,and water supplement periods but declined significantly during the impounding period.The contributions of factors varied considerably.Reservoir scheduling accounted for 328.86% of inflow changes at the Taiping outlet during the drawdown period but only 20.72% during the flood season.River topography changes contributed 157.41% to lake outflow changes during the drawdown period,but only 1.85% during the water supplement period.These findings enhance our understanding of river-lake system evolution and support improved management strategies. 展开更多
关键词 Reservoir scheduling Dongting Lake Jingjiang reach Yangtze River Water exchange
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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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How New-type Urbanization Affects Resilience of Water-energy-food System in a Rapidly Urbanizing Region?Insights from Yangtze River Delta,China 认领 引用
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作者 WEN Yuling CHEN Zhenjie +2 位作者 LI Manchun LIANG Jiale WU Xiaoni 《Chinese Geographical Science》 SCIE CAS CSCD 2026年第7期1210-1228,共19页
As the world’s population expands and urbanization accelerates,the interconnectedness of water,energy,and food(WEF)resources becomes increasingly critical.In the Yangtze River Delta(YRD)of China,rapid urban expansion... As the world’s population expands and urbanization accelerates,the interconnectedness of water,energy,and food(WEF)resources becomes increasingly critical.In the Yangtze River Delta(YRD)of China,rapid urban expansion has heightened WEF demand and environmental pressures,posing challenges to WEF system resilience(WEFSR).To clarify how new-type urbanization(NU)affects WEFSR across dimensions,spatial effects,and periods,this study constructed a multidimensional index system for NU(covering demographic,economic,social,spatial,ecological,and urban-rural integration dimensions)together with a WEFSR index capturing resistance,recoverability,and adaptability,based on panel data from 41 cities in the YRD from 2010 to 2022.We measured city-level WEFSR and NU,analyzed their spatial correlations,and applied a spatial Durbin model to quantify the direct and spillover effects of NU on WEFSR.Results showed that while NU and WEFSR increased,a negative spatial correlation between them highlighted an imbalance in the distribution of NU and WEF resources.NU exerted a negative local effect(−0.057)but a positive spillover effect(0.308)on WEFSR.Population,economic,and social urbanization played a decisive role in the impact of NU on WEFSR.Spatial urbanization negatively impacted the WEFSR of both local and neighboring areas.In contrast,eco-environmental urbanization and urban-rural integration enhanced WEFSR locally and in neighboring areas,with their positive effects being most pronounced in Zhejiang and Anhui provinces.NU reduced local resilience in the WEF subsystems but benefited adjacent regions.These findings provide valuable insights for refining NU strategies and WEF resource management policies in highly urbanized areas. 展开更多
关键词 water-energy-food system resilience(WEFSR) new-type urbanization(NU) spatial Durbin model spatial spillover effect Yangtze River Delta(YRD),China
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How Does Rapid Urbanization Influence Ecosystem Services?Insights from the Yangtze River Economic Belt,China 认领 引用
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作者 BAI Yujuan LIU Qiong +1 位作者 OU Minghao TU Haiyang 《Chinese Geographical Science》 SCIE CAS CSCD 2026年第4期606-621,共16页
Rapid urbanization(UR)profoundly reshapes landscape patterns and modifies ecological functions,thereby affecting ecosystem services(ES).While previous research has explored this topic,studies examining the complex rel... Rapid urbanization(UR)profoundly reshapes landscape patterns and modifies ecological functions,thereby affecting ecosystem services(ES).While previous research has explored this topic,studies examining the complex relationship between UR and ES indicators remain scarce.Taking the Yangtze River Economic Belt(YREB),China as a case study,this study integrates ecological modeling,Random Forest,geographically weighted regression,and bivariate local spatial autocorrelation to analyze the spatiotemporal relationships and interaction mechanisms between multidimensional UR indicators and multiple types of ES from 1980 to 2020.The results show that UR in the YREB follows a clear east-high,west-low gradient pattern,with economic and land urbanization growing notably faster than population urbanization.Among ES,water yield(WY),soil retention(SR),and carbon sequestration have all increased,while habitat quality(HQ)has remained generally stable with a slight decline.UR exerts nonlinear and spatially heterogeneous effects on ES,with SR and HQ negatively affected by population density(POPD)and urban land proportion(ULP),GDP density(GDPD)having positive effects,WY negatively influenced by POPD,net ecosystem productivity(NEP)negatively impacted by ULP,and other UR and ES indicators showing more complex patterns.The spatial interaction between UR and ES is largely characterized by a‘Low URHigh ES'pattern,which enables the functional division of the YREB into Ecological Conservation Areas,Ecological Enhancement Areas,Ecological Source Areas,and Ecological Restoration Areas.This study provides a scientific basis for coordinating regional development and ecological conservation by revealing the spatiotemporal feedback mechanisms within the UR-ES subsystem.The Yangtze River Economic Belt(YREB),China was selected as the study area for this study.As an inland river economic belt with global influence and a pioneering demonstration zone for ecological civilization construction,the YREB has experienced rapid UR since China's reform and opening-up policy in 1978.By 2020,its GDP had reached 47.2 trillion CNY,accounting for about 46.4% of the national total,and its UR rate had exceeded 60%(National Bureau of Statistics of China,2021),making its development process a microcosm of China's broader economic transformation and a representative example of the global UR process.Importantly,the YREB exhibits a notable ecological gradient and UR development differences from west to east(Xu et al.,2021),encompassing both low-and highlevel city types in terms of UR and ES.This diversity provides a representative ideal region for exploring the dynamic changes of ES under different UR contexts. 展开更多
关键词 ecosystem services(ES) urbanization(UR) geographically weighted regression spatial interaction ecological zoning Yangtze River Economic Belt China
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Threshold discharges governing erosion-deposition transition of point bars:A case study of the Sanyiqiao point bar,Yangtze River 认领 引用
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作者 JIN Lingtao CHEN Li +3 位作者 ZHANG Wei GAO Yu ZHANG Kanghe YANG Chenggang 《Journal of Geographical Sciences》 SCIE CSCD 2026年第6期1525-1546,共22页
Identifying threshold discharges that govern erosion-deposition transition is crucial for predicting the morphological evolution of point bars.In this study,a comprehensive framework for quantifying threshold discharg... Identifying threshold discharges that govern erosion-deposition transition is crucial for predicting the morphological evolution of point bars.In this study,a comprehensive framework for quantifying threshold discharges via two-dimensional depth-averaged hydro-morphodynamic modelling(TDHM)is proposed.When applied to the Sanyiqiao point bar in the lower Yangtze River as a case study,the TDHM framework demonstrated high predictive reliability,with root-mean-square error values for the tidal level and flow velocity of 0.072 m and 0.169 m/s,respectively,alongside volumetric change errors ranging from 11%-19%.The results revealed two distinct threshold discharges,namely,one triggering the transition from stability to erosion(20,000-25,000 m3/s)and the other facilitating a shift from net erosion to net deposition(40,000-45,000 m3/s).This dual-threshold behaviour is driven by the nonmonotonic response of the bar surface hydrodynamics to increasing discharge.Channel regulation projects and sediment supply influence these thresholds more notably than tributary inflows do.Recent erosion of the point bar could be attributed to the synergistic effect of the 12.5-m deep-water channel project and a reduced sediment supply.The proposed TDHM framework provides a robust predictive tool for estimating morphological adjustments under future environmental changes,thereby supporting proactive river management and navigational safety. 展开更多
关键词 point bar erosion-deposition transition threshold discharge hydro-morphodynamic modelling Yangtze River
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Spatio-temporal patterns and driving mechanisms of new-type urbanization in the Yangtze River Economic Belt 认领 引用
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作者 CHEN Zehui FANG Chuanglin 《Journal of Geographical Sciences》 SCIE CSCD 2026年第7期1613-1639,共27页
People-oriented new-type urbanization emphasizes the synergistic improvement of level and quality.This study,based on a quantity-quality synergy perspective,constructs a unified theoretical framework integrating these... People-oriented new-type urbanization emphasizes the synergistic improvement of level and quality.This study,based on a quantity-quality synergy perspective,constructs a unified theoretical framework integrating these two dimensions.Focusing on the Yangtze River Economic Belt(YREB)from 2000 to 2022,this study comprehensively examines its new-type urbanization using methods including the entropy method,kernel density estimation,and a synergy evolution model,with driving mechanisms revealed by a Geodetector.The results indicate that:(1)Both the urbanization level and quality in the YREB have continuously increased,with the level rising from 32.54 to 61.64 and the quality from 43.47 to 67.93.However,the urbanization level remains below the national average and exhibits significant regional disparities.(2)The spatial pattern reveals a hierarchical gradient characterized by“downstream leading,midstream in the middle,and upstream lowest”.While central cities demonstrate radiating effects,siphoning effects persist in major southwestern cities,and the northern downstream area lags behind.(3)The synergistic evolution of urbanization level and quality significantly improved,transitioning from a polarized state of“quality lag”and“level imbalance”towards coordinated development.(4)The urbanization development patterns have shifted from extensive to optimal and imbalanced types.The downstream region is dominated by the optimal type,while the midstream and upstream areas primarily exhibit the imbalanced pattern,highlighting a significant potential for level improvement.(5)New-type urbanization in the YREB is driven by the synergistic effects of natural endowment,government regulation,and market adjustment,forming a tripartite system where“Innovation+”plays a particularly crucial role.This research provides a scientific basis for promoting new-type urbanization construction and high-quality development. 展开更多
关键词 new-type urbanization urbanization level urbanization quality synergistic evolution driving mechanism Yangtze River Economic Belt
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Analysis of evolutionary characteristics and causes of drought-flood abrupt alternation in middle and lower reaches of Yangtze River Basin 认领 引用
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作者 WANG Li XIA Huan +4 位作者 YUAN Zhe SHI Xiaoliang LI Zhiyi HU Jing XU Liang 《水利水电技术（中英文）》 CSCD 北大核心 2026年第6期1-20,共20页
[Objective]Under the influence of the subtropical monsoon climate,drought-flood abrupt alternation(DFAA)events frequently occur in the middle and lower reaches of the Yangtze River Basin(MLRYRB),posing a serious threa... [Objective]Under the influence of the subtropical monsoon climate,drought-flood abrupt alternation(DFAA)events frequently occur in the middle and lower reaches of the Yangtze River Basin(MLRYRB),posing a serious threat to the sustainable development of the river basin.Therefore,accurately identifying and analyzing the evolution patterns and causes of DFAA events is of great significance for formulating regional disaster prevention and mitigation strategies.[Methods]The short-cycle drought-flood abrupt alternation index(SDFAI)was employed as an indicator for identifying DFAA events to examine the spatiotemporal characteristics of drought-to-flood(DTF)and flood-to-drought(FTD)events in the middle and lower reaches of the Yangtze River,including their frequency,spatial extent,and intensity.Furthermore,the multiscale geographically weighted regression(MGWR)model and the random forest(RF)model were used to quantify the meteorological and atmospheric circulation factors of DFAA events.[Results]The result showed that:(1)DTF and FTD events occurred alternately,with the annual maximum intensity of DTF events showing a decreasing trend and that of FTD events showing an increasing trend,indicating a shift from DTF-dominated to FTD-dominated patterns.(2)The number of occurrences of both DTF and FTD events was primarily concentrated between 22 and 26 times,with the slight events exhibiting the broadest spatial extent and moderate-intensity events being the most frequent.Spatially,western Hunan,southern Anhui,and southern Jiangsu were DTF-prone areas,while southern Hunan and southern Hubei were more susceptible to FTD events.(3)Temperature(TRE)and precipitation(PRE)were the dominant meteorological drivers of DFAA events,serving as the primary or secondary influencing factors in more than 50%of the region.However,sunshine duration(SSD)was the primary influencing factor for FTD events in 29.12%of the region.The El Niño-Southern Oscillation(ENSO)and Sunspot were the major atmospheric circulation factors influencing DFAA events.[Conclusion]Compared to FTD events,DTF events exhibited greater intensity,frequency,and spatial extent in the MLRYRB.Hunan,central Hubei,and southern Anhui are regions with frequent occurrences of DFAA events.TEM and PRE are the dominant meteorological drivers of DFAA events,while the ENSO and Sunspot were the key atmospheric circulation factors.These findings can provide scientific guidance for improving the monitoring,prediction,and management of DFAA events in this region. 展开更多
关键词 short-cycle drought-flood abrupt alternation index multiscale geographically weighted regression random forest driving factor middle and lower reaches of Yangtze River Basin atmospheric circulation ENSO influencing factors
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The Coupling and Coordinated Relationship between“Rich” and“ Old” in Cities and Counties of the Yangtze River Delta Region and Its Evolutionary Characteristics: Empirical Analysis from the 2000- 2020 Census Data 认领 引用
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作者 Li Chen Zhou Haoran 《全球城市研究（中英文）》 2026年第1期72-98,151,152,共27页
China is currently an aging society and will remain so for the foreseeable future.The coupled and coordinated development of“rich”and“old”plays a significant role in advancing Chinese-style modernization.Research ... China is currently an aging society and will remain so for the foreseeable future.The coupled and coordinated development of“rich”and“old”plays a significant role in advancing Chinese-style modernization.Research on the relationship between“rich”and“old”across 208 cities and counties in the Yangtze River Delta region reveals the following findings:(1)There is a significant positive correlation between“rich”and“old”in this region.The coupling degree between the wealthy and the aging is relatively high,but the coordination level is low.(2)Cities and counties with moderate coordination and a“rich”status show a“bow-shaped”spatial distribution,while cities and counties with lower wealth and moderate aging are mostly found in economically underdeveloped regions.(3)Over time,economic disparities have narrowed,but differences in aging have gradually worsened.In terms of the coordination between“rich”and“old”,Shanghai performs the best,followed by Jiangsu and Zhejiang,while Anhui has made relatively slow progress.(4)In terms of the transition of“rich”and“old”at the beginning of the study,most cities and counties were classified as“early old without being rich”.By the end of the study,the proportion of wealthy cities and counties had significantly increased,forming a diverse spatial pattern including“rich with moderate old”“rich with deep old”moderate“old without being rich”and“deep old without being rich”. 展开更多
关键词 Old and Rich Type Coupling Coordination Degree Evolutionary Characteristics Yangtze River Delta region
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