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A classification modeling strategy based on dominant factors of salinization to enhance remote sensing inversion accuracy 认领 引用
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作者 Mengchao Zheng Jianjun Zhang +9 位作者 Weini Wang Zhigang Qiao Junmei Liu Min Gong Xiaobin Li Hongyuan Zhang Yuyi Li Ningning Li Lin Yang Wenjuan Li 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2026年第6期2607-2622,共16页
Soil salinization represents a primary manifestation of land degradation and presents a significant threat to sustainable agricultural development.Remote sensing-based methodologies currently constitute the preferred ... Soil salinization represents a primary manifestation of land degradation and presents a significant threat to sustainable agricultural development.Remote sensing-based methodologies currently constitute the preferred approach for salinization monitoring.Environmental factors'spatial heterogeneity substantially constrains the modeling process in accurately capturing the soil salt content(SSC)-modeling factor relationship,thereby affecting monitoring accuracy.This study proposes a classification modeling framework based on dominant salinization factors,establishing distinct remote sensing inversion models through categorization of soil texture and surface drainage conditions.Results indicate that classification modeling substantially improves the capture of SSC-modeling factor relationships.The efficacy of identical modeling indicators and methods varies significantly across different classification scenarios.Among the three modeling approaches,random forest demonstrates superior overall robustness.Of the three variable selection methods,light gradient boosting machine(Light GBM)shows the strongest compatibility with the modeling approaches.The classification strategy significantly enhances model accuracy:compared to non-classified modeling(R2V=0.62),the testing set R2increases by up to 24%(R2V=0.77).Models under poor surface drainage category demonstrate optimal performance,with coupled models achieving R2C=0.82(training set)and R2V=0.77(testing set).This research provides valuable insights for remote sensing monitoring of soil salinization in precision agriculture contexts. 展开更多
关键词 soil salinization remote sensing spatial heterogeneity machine learning food security
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Quantitative inversion of soil salinization in salt lake regions:Spatiotemporal variation and driving mechanisms 认领 引用
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作者 HAN Jinjun WANG Zitao +3 位作者 WANG Jianping ZHAO Chuntao YU Dongmei LIU Zhaofeng 《Journal of Geographical Sciences》 SCIE CSCD 2026年第3期732-762,共31页
To address soil salinization’s significant impact on human production and livelihood in arid regions,especially in high-salinity areas like salt lake regions,this study used multi-source remote sensing data to extrac... To address soil salinization’s significant impact on human production and livelihood in arid regions,especially in high-salinity areas like salt lake regions,this study used multi-source remote sensing data to extract 52 surface factors.Combined with measured soil salinity data,correlation analysis,multicollinearity testing,and projection importance analysis identified eight dominant factors.Subsequently,four machine learning algorithms were applied for modeling,and the optimal models were selected to study the spatiotemporal variation of soil salinization.The results indicate that the average soil salt content in the study area was 20.74%in 2020.LST(land surface temperature)can effectively identify areas with high salinity,such as saline-alkali land and salt flats.Among inversion models,the GBDT(gradient boosting decision trees)model demonstrated the highest predictive ability and minimal errors.The optimal inversion results revealed that soil salinization distribution was influenced by topographic elevation,distance from Qarhan Salt Lake,and river network density.Over the past 21 years,there was significant fluctuation in soil salinity observed in the concentrated area of grassland within the groundwater overflow zone,indicating strong variation in salinization.This fluctuation correlates with changes in groundwater levels in the groundwater overflow zone,which are influenced by temperature variations that determine the amount of snow and ice meltwater,and the precipitation in the upstream area.This study enhances understanding of soil salinization and its drivers in extremely arid salt lake regions. 展开更多
关键词 soil salinization salt lake regions machine learning modeling driving mechanisms remote sensing
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Effects of deficit winter irrigation with overwintering freezing on oasis soil salinization and alkalization 认领 引用
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作者 Xicai PAN Jiabao ZHANG +1 位作者 Yanfang ZHOU Chengwei WAN 《Pedosphere》 SCIE CAS CSCD 2025年第3期569-579,共11页
Winter irrigation is a crucial measure for preventing farmland salinity in arid inland regions.However,given the relatively complex process of salt leaching under the influence of freezing and thawing,present salinity... Winter irrigation is a crucial measure for preventing farmland salinity in arid inland regions.However,given the relatively complex process of salt leaching under the influence of freezing and thawing,present salinity management has led to soil quality deterioration in the irrigation areas in Northwest China.To better understand this process,a field experiment was conducted in Huangyang Town,Wuwei City,Gansu Province,China to simulate the evolution of soil profile salinity and alkalinity in a typical oasis farmland under 3-year regular barley planting,using a local prevailing water-salt management mode of drip irrigation for the growing period and winter irrigation for the fallow period.This study investigated the impact of freezing on salt leaching by comparing the soil profile water,heat,and salt movements under different winter irrigation quotas.Compared to no winter irrigation,a reduction in the winter irrigation quota from the standard one to a halved one led to a transition from a sink of 11.05% by salt leaching to a source of 13.75% by salt addition.This means that overwintering soil freezing,especially in oases with deep groundwater tables,can worsen root zone salinization caused by a deficit winter irrigation,through freezing-induced root zone soil water and salt return.Furthermore,dry saline soil dominated by sulfate is at the risk of soil alkalization when freezing-induced oversaturation of solute concentration leads to significant salt precipitation.These findings are crucial for understanding the mechanisms behind the increasing secondary salinization caused by unsustainable winter irrigation in oasis irrigation areas. 展开更多
关键词 groundwater table salt leaching salt precipitation secondary salinization sodium adsorption ratio total dissolved solid
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Dynamics and drivers of soil salinization in arid and semiarid regions from 2002 to 2021:A case study in the Qaidam Basin 认领 引用
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作者 Xiaolin She Chuanbao Jing +5 位作者 Weihong Liu Lu Zhang Zujun Zhao Zimu Wang Wanchen Li Zhiming Zhang 《Ecological Frontiers》 CSCD 2025年第5期1235-1247,共13页
Soil salinization is a prominent ecological and environmental issue in arid and semiarid regions worldwide and poses a significant obstacle to local sustainable development.Previous studies on soil salinization in ari... Soil salinization is a prominent ecological and environmental issue in arid and semiarid regions worldwide and poses a significant obstacle to local sustainable development.Previous studies on soil salinization in arid and semiarid regions have focused primarily on short-term and small-scale analyses,with little attention given to the long-term dynamics of such issues.Here,we employed seven machine learning methods and geographic detector models to map the spatial-temporal evolution of soil salinization and quantify its driving factors from 2002 to 2021 using Landsat time series in the Qaidam Basin.The random forest algorithm demonstrated optimal performance.Our results revealed that salinized soils constituted over 70%of the total land area during the study period,with a net reduction of 59.7×103 km2 in salinized areas.Highly salinized soils concentrated in central and northern regions,while ecological improvement was evidenced by transitions from extreme to less severe salinization categories.Subsequently,shallow groundwater is the primary driver of the spatial distribution of soil salinization,followed by annual average precipitation,elevation,annual average temperature,and wind speed,which are related to terrain and climatic conditions.We recommend implementing targeted management strategies to regulate groundwater extraction and mitigate salinization risks.Priority should be given to interventions in mildly salinized areas to prevent further degradation.This study offers scientific support for sustainable land and water resource management in the Tibetan Plateau and similar dryland regions. 展开更多
关键词 Soil salinization Qinghai-Tibet plateau Time series dynamics Driving factors Spatial pattern
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Digital mapping of soil salinization based on Sentinel-1 and Sentinel-2 data combined with machine learning algorithms 认领 引用 被引量：14
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作者 Guolin Ma Jianli Ding +2 位作者 Lijng Han Zipeng Zhang Si Ran 《Regional Sustainability》 2021年第2期177-188,共12页
Soil salinization is one of the most important causes of land degradation and desertification,especially in arid and semi-arid areas.The dynamic monitoring of soil salinization is of great significance to land managem... Soil salinization is one of the most important causes of land degradation and desertification,especially in arid and semi-arid areas.The dynamic monitoring of soil salinization is of great significance to land management,agricultural activities,water quality,and sustainable development.The remote sensing images taken by the synthetic aperture radar(SAR)Sentinel-1 and the multispectral satellite Sentinel-2 with high resolution and short revisit period have the potential to monitor the spatial distribution of soil attribute information on a large area;however,there are limited studies on the combination of Sentinel-1 and Sentinel-2 for digital mapping of soil salinization.Therefore,in this study,we used topography indices derived from digital elevation model(DEM),SAR indices generated by Sentinel-1,and vegetation indices generated by Sentinel-2 to map soil salinization in the Ogan-Kuqa River Oasis located in the central and northern Tarim Basin in Xinjiang of China,and evaluated the potential of multi-source sensors to predict soil salinity.Using the soil electrical conductivity(EC)values of 70 ground sampling sites as the target variable and the optimal environmental factors as the predictive variable,we constructed three soil salinity inversion models based on classification and regression tree(CART),random forest(RF),and extreme gradient boosting(XGBoost).Then,we evaluated the prediction ability of different models through the five-fold cross validation.The prediction accuracy of XGBoost model is better than those of CART and RF,and soil salinity predicted by the three models has similar spatial distribution characteristics.Compared with the combination of topography indices and vegetation indices,the addition of SAR indices effectively improves the prediction accuracy of the model.In general,the method of soil salinity prediction based on multi-source sensor combination is better than that based on a single sensor.In addition,SAR indices,vegetation indices,and topography indices are all effective variables for soil salinity prediction.Weighted Difference Vegetation Index(WDVI)is designated as the most important variable in these variables,followed by DEM.The results showed that the high-resolution radar Sentinel-1 and multispectral Sentinel-2 have the potential to develop soil salinity prediction model. 展开更多
关键词 Salinization Digital soil mapping XGBoost Sentinel-1 Sentinel-2 Ogan-Kuqa River Oasis
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Challenges for the sustainable use of water and land resources under a changing climate and increasing salinization in the Jizzakh irrigation zone of Uzbekistan 认领 引用 被引量：4
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作者 Rashid KULMATOV Jasur MIRZAEV +1 位作者 Jilili ABUDUWAILI Bakhtiyor KARIMOV 《Journal of Arid Land》 SCIE CSCD 2020年第1期90-103,共14页
Jizzakh Province in Uzbekistan is one of the largest irrigated areas in Central Asia without natural drainage.In combination with aridity,climate change and extensive irrigation practices,this has led to the widesprea... Jizzakh Province in Uzbekistan is one of the largest irrigated areas in Central Asia without natural drainage.In combination with aridity,climate change and extensive irrigation practices,this has led to the widespread salinization of agricultural land.The aim of this study was to identify opportunities to improve the reclamation status of the irrigated area and how best to effectively use the water resources in Jizzakh Province based on investigations conducted between 1995 and 2016.A database of field measurements of groundwater levels,mineralization and soil salinity conducted by the provincial Hydro-Geological Reclamation Expeditions was used in the study.The total groundwater mineralization was determined using a portable electric conductometer(Progress 1T)and the chloride concentration was determined using the Mohr method.The soil salinity analyses were conducted by applying two different methods:(1)the extraction and assessment of the soluble salt content,and(2)using an SM-138 conductivity sensor applied to a 1:1 mixture of soil sample and water.The analyses of the monitoring results and the salt balance in the"irrigation water–soil–drainage water"system clearly demonstrated that the condition of the irrigated land in the province was not significantly improved.Under these conditions,the stability of crop yields is achieved mainly through the use of large volumes of fertilizer.However,excess amounts of mineral fertilizers can also cause the salinization of soils.The average groundwater salinization value in most of the irrigated land(75.3%)fluctuated between 1.1 and 5.0 g/L,while the values were less than 1.0 g/L in 13.1%of the land and in the range of 5.1–10.0 g/L in 10.5%of the land.During the period of 1995–2016 the salinization level of the irrigated land in Jizzakh Province increased slightly and the area could be divided into the following classes:no salinity(17.7%of the total area),low salinity(51.3%),moderate salinity(29.0%),and high salinity(2.0%).Detailed studies of the salt balance in irrigated land,the impact of climate change,increased fertilizer use,and repeated remediation leaching on the groundwater level and mineralization should be conducted in the future,due to the possibility of accelerated salinization,fertility decline,and reduced yields of agricultural crops. 展开更多
关键词 irrigation groundwater level salinity soil salinization salt balance Uzbekistan
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Study on Soil Salinization Information in Arid Region Using Remote Sensing Technique 认领 引用 被引量：23
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作者 DING Jian-li WU Man-chun Tashpolat Tiyip 《Agricultural Sciences in China》 CSCD 2011年第3期404-411,共8页
Extracting information about saline soils from remote sensing data is useful,particularly given the environmental significance and changing nature of these areas in arid environments.One interesting case study to cons... Extracting information about saline soils from remote sensing data is useful,particularly given the environmental significance and changing nature of these areas in arid environments.One interesting case study to consider is the delta oasis of the Weigan and Kuqa rivers,China,which was studied using a Landsat Enhanced Thematic Mapper Plus(ETM+)image collected in August 2001.In recent years,decision tree classifiers have been successfully used for land cover classification from remote sensing data.Principal component analysis(PCA)is a popular data reduction technique used to help build a decision tree;it reduces complexity and can help the classification precision of a decision tree to be improved.A decision tree approach was used to determine the key variables to be used for classification and ultimately extract salinized soil from other cover and soil types within the study area.According to the research,the third principal component(PC3)is an effective variable in the decision tree classification for salinized soil information extraction.The research demonstrated that the PC3 was the best band to identify areas of severely salinized soil;the blue spectral band from the ETM+sensor(TM1)was the best band to identify salinized soil with the salt-tolerant vegetation of tamarisk(Tamarix chinensis Lour);and areas comprising mixed water bodies and vegetation can be identified using the spectral indices MNDWI(modified normalized difference water index)and NDVI(normalized difference vegetation index).Based upon this analysis,a decision tree classifier was applied to classify landcover types with different levels of soil saline.The results were checked using a statistical accuracy assessment.The overall accuracy of the classification was 94.80%,which suggested that the decision tree model is a simple and effective method with relatively high precision. 展开更多
关键词 soil salinization information arid region remote sensing
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Satellite-Based Monitoring of Decadal Soil Salinization and Climate Effects in a Semi-arid Region of China 认领 引用 被引量：14
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作者 王鹤松 贾根锁 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2012年第5期1089-1099,共11页
Soil salinization is a common phenomenon that affects both the environment and the socio-economy in arid and semi-arid regions; it is also an important aspect of land cover change. In this study, we integrated multi-s... Soil salinization is a common phenomenon that affects both the environment and the socio-economy in arid and semi-arid regions; it is also an important aspect of land cover change. In this study, we integrated multi-sensor remote sensing data with a field survey to analyze processes of soil salinization in a semi-arid area in China from 1979 to 2009. Generally, the area of salt-affected soils increased by 0.28% per year with remarkable acceleration from 1999 to 2009 （0.42% increase per year）. In contrast, the area of surface water bodies showed a decreasing trend （-0.08% per year） in the same period. Decreases in precipitation and increases in aridity due to annual （especially summer） warming provided a favorable condition for soil salinization. The relatively flat terrain favored waterlogging at the surface, and continuous drought facilitated upward movement of soil water and accumulation of surface saline and calcium. Meanwhile, land-use practices also played a crucial role in accelerating soil salinization. The conversion to cropland from natural vegetation greatly increased the demand for groundwater irrigation and aggravated the process of soil salinization. Furthermore, there are potential feedbacks of soil salinization to regional climate. The salinization of soils can limit the efficiency of plant water use as well as photosynthesis; therefore, it reduces the amount of carbon sequestrated by terrestrial ecosystem. Soil salinization also reduces the absorbed solar radiation by increasing land surface albedo. Such conversions of land cover significantly change the energy and water balance between land and atmosphere. 展开更多
关键词 soil salinization land cover change remote sensing semi-arid China land atmosphere inter- actions
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Climate and topography regulate the spatial pattern of soil salinization and its effects on shrub community structure in Northwest China 认领 引用 被引量：2
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作者 DU Lan TIAN Shengchuan +5 位作者 ZHAO Nan ZHANG Bin MU Xiaohan TANG Lisong ZHENG Xinjun LI Yan 《Journal of Arid Land》 SCIE CSCD 2024年第7期925-942,共18页
Soil salinization may affect biodiversity and species composition,leading to changes in the plant community structure.However,few studies have explored the spatial pattern of soil salinization and its effects on shrub... Soil salinization may affect biodiversity and species composition,leading to changes in the plant community structure.However,few studies have explored the spatial pattern of soil salinization and its effects on shrub community structure at the ecosystem scale.Therefore,we conducted a transect sampling of desert shrublands in Northwest China during the growing season(June–September)in 2021.Soil salinization(both the degree and type),shrub community structure(e.g.,shrub density and height),and biodiversity parameters(e.g.,Simpson diversity,Margalf abundance,Shannon-Wiener diversity,and Pielou evenness indices)were used to assess the effects of soil salinization on shrub community structure.The results showed that the primary degree of soil salinization in the study area was light salinization,with the area proportion of 69.8%.Whereas the main type of soil salinization was characterized as sulfate saline soil,also accounting for 69.8%of the total area.Notably,there was a significant reduction in the degree of soil salinization and a shift in the type of soil salinization from chloride saline soil to sulfate saline soil,with an increase in longitude.Regional mean annual precipitation(MAP),mean annual evapotranspiration(MAE),elevation,and slope significantly contributed to soil salinization and its geochemical differentiation.As soil salinization intensified,shrub community structure displayed increased diversity and evenness,as indicated by the increases in the Simpson diversity,Shannon-Wiener diversity,and Pielou evenness indices.Moreover,the succulent stems and leaves of Chenopodiaceae and Tamaricaceae exhibited clear advantages under these conditions.Furthermore,regional climate and topography,such as MAP,MAE,and elevation,had greater effects on the distribution of shrub plants than soil salinization.These results provide a reference for the origin and pattern of soil salinization in drylands and their effects on the community structure of halophyte shrub species. 展开更多
关键词 soil salinization halophytes shrubland climate change biodiversity drylands Northwest China
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The Mechanism of Groundwater Salinization and Its Control in the Yaoba Oasis,Inner Mongolia 认领 引用 被引量：2
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作者 WANG Bingchen QIU Hanxue +2 位作者 XU Qian ZHENG Xilai LIU Guanqun 《Acta Geologica Sinica(English Edition)》 SCIE CAS 2000年第2期362-369,共8页
The arid area is one of the most concerned areas among the water resources researchers and economists. Northwest China will be an important developing region of China in the 21st century. Yaoba is a well-irrigation oa... The arid area is one of the most concerned areas among the water resources researchers and economists. Northwest China will be an important developing region of China in the 21st century. Yaoba is a well-irrigation oasis within this arid area, which is located in the Alxa area west of the Helan Mountains and next to the Tengger desert in the east. It has contributed greatly to the local stock raising and agriculture since its development in 1970. However, the groundwater which the oasis depends on to survive has been getting salinized gradually and more serious in recent years. 展开更多
关键词 Yaoba oasis groundwater salinization reinfiltrated irrigation water flood irrigation
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Land Degradation Due to Salinization in Arid and Semi-arid Regions with the Aid of Geo-information Techniques 认领 引用 被引量：5
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作者 MushtakT. Jabbar CHEN Xiaoling 《Geo-Spatial Information Science》 EI 2008年第2期112-120,共9页
This study applied a computerized parametric methodology to monitor, map, and quantify land degradation by salinization risk detection techniques at a 1：250 000 mapping scale using geo-information technology. The nor... This study applied a computerized parametric methodology to monitor, map, and quantify land degradation by salinization risk detection techniques at a 1：250 000 mapping scale using geo-information technology. The northern part of the Shaanxi province in China was taken as a case. Multi-temporal remotely sensed materials of both Landsat TM and thematic maps （ETM＋） were used as the bases to provide comprehensive views of surface conditions such as vegetation cover and salinization detection. With ERDAS ver. 9.1 software, the Normalized Differential Salinity Index （NDSl） and Salinity Index （S.I.） were computed and then evaluated for land degradation by salinization. Arc/Info ver. 9.2 software was used along with field observation data （GPS） for analysis. Using spatial analysis methods, results showed that 19 973.1 km^2 （72%） of land had no risk of land degradation by salinization, 3 684.7 km^2 （13%） had slight land degradation by salinization risk, 2 797.9 km^2 （10%） had moderate land degradation by salinization risk, and 1 218.9 km^2 （4%） of the total land area was at a high risk of land degradation by salinization. The study area, in general, is exposed to a high risk of soil salinization. 展开更多
关键词 geo-information techniques land degradation soil salinization indices
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Qualitative analysis and quantitative simulation on Yin-Huang water salinization mechanism in Bei-Da-Gang Reservoir 认领 引用 被引量：1
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作者 ZHAO Wen-yu WANG Qi-shan +2 位作者 WU Li-bo ZHANG Bin WANG Xiao-qin 《Journal of Environmental Sciences》 SCIE EI CAS 2005年第5期853-856,共4页
Yellow River water transfer for Tianjin is important in solving the water shortage in Tianjin, which facilitate economic development and social progress for many years. Fresh water drawn from Yellow River（ i. e., Yin... Yellow River water transfer for Tianjin is important in solving the water shortage in Tianjin, which facilitate economic development and social progress for many years. Fresh water drawn from Yellow River（ i. e., Yin-Huang water） becomes saltier and saltier when being stored in the Bei-Da-Gang reservoir. We qualitatively analyze the water salinization mechanism based on mass transfer theory. The main factors are salinity transfer of saline soil, evaporation concentrating, and the agitation of wind. A simulative experimental pond and an evaporation pond were built beside the Bei-Da-Gang reservoir to quantitatively investigate the water salinization based on water and solute balance in the simulative pond. 80% of increased [Cl^-] is due to the salinity transfer of the saline soil and the other 20% is due to evaporation concentrating, so the former is the most important factor. We found that the salinization of Yin-Huang water can be described with a zero-dimension linear model. 展开更多
关键词 Yin-Huang-Ji-Jin Project water salinization simulative experiment saline soil evaporation concentrating mass transfermathematical model
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A quantitative assessment on groundwater salinization in the Tarim River lower reaches,Northwest China 认领 引用 被引量：2
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作者 JianHua Xu WeiHong Li +2 位作者 YuLian Hong ChunMeng Wei Jie Tang 《Research in Cold and Arid Regions》 CSCD 2014年第1期44-51,共8页
Based on monitored data from 840 samples, we assessed the spatial and temporal variability of groundwater salinization in the Tarim River lower reaches combining classical statistics and geostatistics. Results show th... Based on monitored data from 840 samples, we assessed the spatial and temporal variability of groundwater salinization in the Tarim River lower reaches combining classical statistics and geostatistics. Results show that total dissolved solids （TDS） is significantly correlated with other related ions, such as Na＋, Mg2＋, Ca2-, C1- and K＋. TDS and underground water level have characteristics of spatial autocorrelation, both of which present the isotropic characteristic and con- form to the spherical model in each year from 2001-2009. TDS is basically greater than 1 g/L but less than 2 g/L in the Tarim River lower reaches, which indicates that salt stagnation pollution is more serious. The most serious salinization （3 g/L 〈 TDS _〈 35 g/L） contaminated area is mainly in the middle and lower part of the study area. 展开更多
关键词 groundwater salinization assessment semivariogram geostatistics lower reaches of the Tarim River
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Application of stable isotope techniques to the study of soil salinization 认领 引用 被引量：2
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作者 YongQin CUI JianYing MA Wei SUN 《Journal of Arid Land》 SCIE 2011年第4期285-291,共7页
In this paper,we reviewed the progress in the application of stable isotope techniques to the study of soil salinization.As a powerful technique,stable isotopes have been widely used in the studies of soil water evapo... In this paper,we reviewed the progress in the application of stable isotope techniques to the study of soil salinization.As a powerful technique,stable isotopes have been widely used in the studies of soil water evaporation,the dynamics of soil salinization and salt-tolerant plant breeding.The impact of single environmental factors on plant isotope composition has been the focus of previous studies.However,the impact of multiple environmental factors on plant isotope composition remains unclear and needs to be carefully studied.In order to gain insights into soil salinization and amelioration,especially soil salinization in arid and semiarid areas,it is essential to employ stable isotope techniques and combine them with other methods,such as located field observation and remote sensing technology. 展开更多
关键词 stable isotope soil water evaporation soil salinization dynamic salt-tolerant plants breeding
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Space-Time Variability and Prognosis of Soil Salinization in Yucheng City, China 认领 引用 被引量：10
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作者 YANG Yu-Jian YANG Jing-Song LIU Guang-Ming YANG Xiao-Ying 《Pedosphere》 SCIE CAS 2005年第6期797-804,共8页
This research used both geostatistics and GIS approach to compare temporal change of soil salt between 1980 and 2003, to analyze the spatial distribution of surface soil salt, to developed methods for predicting soil ... This research used both geostatistics and GIS approach to compare temporal change of soil salt between 1980 and 2003, to analyze the spatial distribution of surface soil salt, to developed methods for predicting soil salinization potential based on recent improvements to the Dempster-Shafer theory, and to develop probability maps of potential salinization in Yucheng City, China. A semivariogram model of soil salt content was developed from the spherical model, and then employing kriging interpolation the spatial distribution of salt content in 2003 was obtained utilizing data from 100 soil sampling points. Potential salinization distribution was mapped using an approach that integrated soil data of the second general survey in 1980 in Yucheng City, which included groundwater salinity, groundwater depth, soil texture, soil organic matter content, and geomorphic maps. With the support of Dempster-Shafer theory and fuzzy set technique the factors that affected potential soil salinization were characterized and integrated; and then soil salinization was predicted. Finally a prognosis map of potential salinization distribution in the research area was obtained, with higher probability values indicating higher hazards to salinity processes. The distribution of the potential soil salinization probability was a successive surface. 展开更多
关键词 Dempster-Shafer theory GIS kriging interpolation prognosis soil salinization
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Impacts of land use and salinization on soil inorganic and organic carbon in the middle-lower Yellow River Delta 认领 引用 被引量：8
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作者 Yang GUO Xiujun WANG +5 位作者 Xianglan LI Minggang XU Yuan LI Haonan ZHENG Yongming LUO Pete SMITH 《Pedosphere》 SCIE CAS CSCD 2021年第6期839-848,共10页
Soil inorganic carbon(SIC)is an important reservoir of carbon(C)in arid,semi-arid,and semi-humid regions.However,knowledge is incomplete on the dynamics of SIC and its relationship with soil organic C(SOC)under differ... Soil inorganic carbon(SIC)is an important reservoir of carbon(C)in arid,semi-arid,and semi-humid regions.However,knowledge is incomplete on the dynamics of SIC and its relationship with soil organic C(SOC)under different land use types in the semi-humid region,particularly in coastal zones impacted by soil salinization.We collected 170 soil samples from 34 profiles across various land use types(maize-wheat,cotton,paddy,and reed)in the middle-lower Yellow River Delta(YRD),China.We measured soil pH,electrical conductivity(EC),water-soluble salts,and SOC and SIC contents.Our results showed significant differences in both SOC and SIC among land use types.The dry cropland(maize-wheat and cotton)soils had significantly higher SOC and SIC densities(4.71 and 15.46 kg C m-2,respectively)than the paddy soils(3.28 and 14.09 kg C m-2,respectively)in the 0–100 cm layer.Compared with paddy soils,reed soils contained significantly higher SOC(4.68 kg C m-2)and similar SIC(15.02 kg C m-2)densities.There was a significant positive correlation between SOC and SIC densities over a 0–100 cm soil depth in dry cropland soils,but a negative relationship in the paddy soils.On average,SOC and SIC densities under maize-wheat cropping were 15%and 4%lower,respectively,in the salt-affected soils in the middle-lower YRD than the upper YRD.This study indicated that land use types had great influences on both SOC and SIC and their relationship,and salinization had adverse effect on soil C storage in the YRD. 展开更多
关键词 C densities C stocks land use type salt-affected soil soil salinization
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Effect of EM Bokashi application on control of secondary soil salinization 认领 引用 被引量：3
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作者 Shao Xiaohou Tan Min +1 位作者 Jiang Ping Cao Weiling 《Water Science and Engineering》 CAS 2008年第4期99-106,共8页
In order to ameliorate saline-alkaline soil, EM Bokashi has been applied to rice production in conjunction with subdrainage in Ningxia Autonomous Region and Zhejiang Province. The preliminary results can be summarized... In order to ameliorate saline-alkaline soil, EM Bokashi has been applied to rice production in conjunction with subdrainage in Ningxia Autonomous Region and Zhejiang Province. The preliminary results can be summarized as follows： EM Bokashi can increase soil organic matter content, improve soil porosity and permeability, and raise the soil＇s levels of available nutrients; and EM Bokashi combined with subdrainage treatment is more effective in controlling secondary soil salinization and raising the grain yield and quality than other treatments. The results suggest that EM Bokashi can reduce the necessary amount of chemical fertilizer application, thereby improving the agricultural environment, and that the introduction of EM Bokashi into systems of secondary soil salinization control systems has resulted in significant benefits. 展开更多
关键词 EM Bokashi secondary salinization control soil amelioration grain yield and quality subdrainage agricultural environment
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Spatial distribution of soil salinization under the influence of human activities in arid areas,China 认领 引用 被引量：1
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作者 LIU Yufang YANG Qingwen +5 位作者 PEI Xiangjun LI Jingji WANG Shuangcheng HUANG Zhenfu HAN Wei ZHENG Tianliang 《Journal of Arid Land》 SCIE CSCD 2024年第10期1344-1364,共21页
The Hotan Prefecture of Xinjiang Uygur Autonomous Region,China belongs to arid desert climate,with significant soil salinization issues.The study selected six rivers in Hotan Prefecture(Pishan,Qaraqash,Yurungqash,Cell... The Hotan Prefecture of Xinjiang Uygur Autonomous Region,China belongs to arid desert climate,with significant soil salinization issues.The study selected six rivers in Hotan Prefecture(Pishan,Qaraqash,Yurungqash,Celle,Kriya,and Niya rivers)to explore the spatial distribution of soil salinization in this area and its underlying mechanisms.Sampling was conducted along each river's watershed,from the Gobi in the upper reaches,through the anthropogenic impact area in the middle reaches,to the desert area in the lower reaches.Soil physical-chemical indicators,including total soluble salts,pH,K+,Na+,Ca2+,Mg2+,SO42-,Cl-,CO32-,HCO3-,organic matter,available nitrogen,available phosphorus,and available potassium,were tested,along with the total dissolved solids of surface water and groundwater.The results revealed that the soil water and nutrient contents in anthropogenic impact area were higher than those in Gobi and desert areas,while the pH and total soluble salts were lower than those in Gobi and desert areas.The ions in the soil of the study area were primarily Cl-,SO42-,K+,and Na+,and the ion concentration of soil salt were positively correlated with surface water and groundwater.Overall,the study area exhibited low soil water content,low clay content,infertile soil,and high soil salinization,dominated by weak to moderate chloride-sulfate types.Compared with Gobi and desert areas,the soil in anthropogenic impact area had higher soil water content,lower pH,lower soluble salts,and higher nutrients,indicating that human farming activities help mitigate salinization.These findings have practical implications for guiding the scientific prevention and control of soil salinization in the arid areas and for promoting sustainable agricultural development. 展开更多
关键词 soil salinization human activities spatial distribution Hotan Prefecture soil soluble salt soil nutrient
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Salinization-Desalinization (SDS) Processes—A Linkage between Hula Valley and Lake Kinneret Ecosystem Management 认领 引用
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作者 Moshe Gophen 《Open Journal of Ecology》 2024年第9期731-746,共16页
The salinization process resulted in agricultural damage in the Hula Valley and water quality deterioration in Lake Kinneret. Therefore, salinization-desalinization (SDS) processes have been emphasized in the last two... The salinization process resulted in agricultural damage in the Hula Valley and water quality deterioration in Lake Kinneret. Therefore, salinization-desalinization (SDS) processes have been emphasized in the last two decades. Global and regional extreme climatological events and water scarcity strengthen the link between Hula Valley and Lake Kinneret management design. A bond between optimizing Hula agricultural maintenance and Kinneret water quality protection is conclusively suggested. Saline contribution originated from the southern Hula Valley region to the underground and surface water is higher than from the northern organic soil. The impact of eastern water Intrusion from the Golan Heights as surface waters, river discharge and underground seepage into the Hula Valley represent north-south gradient enhancement. Salinized surface water contribution from the Hula Valley to Lake Kinneret is unwanted because presently Kinneret desalinization management policy is critically required. The present salinization of surface and underground water in the Hula Valley indicates the upper limit suitable for agricultural crop optimization and the decline of salinity is crucial. Enhancement of the portion of Jordan water within the total balance in the valley is beneficial for Hula agricultural crops but serves as a disadvantage to Kinneret desalinization implementation. Therefore, the enhancement of lake water exchange is recommended. 展开更多
关键词 Hula Valley Lake Kinneret Salinization Desalinization
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Determination of land salinization causes via land cover and hydrological process change detection in a typical part of Songnen Plain 认领 引用 被引量：6
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作者 王志勇 李丽娟 《Journal of Geographical Sciences》 SCIE CSCD 2018年第8期1099-1112,共14页
Causes of land salinization were determined via land cover and hydrological process change detection in a typical part of Songnen Plain. The area of saline land increased from 4627 km2 in 1980 to 5416 km2 in 2000, and... Causes of land salinization were determined via land cover and hydrological process change detection in a typical part of Songnen Plain. The area of saline land increased from 4627 km2 in 1980 to 5416 km2 in 2000, and then decreased to 5198 km2 in 2015. The transformation between saline land and other land covers happened mainly before 2000, and saline land had transformation relationship mainly with cropland, grassland, and water body. From 1979 to 2007, groundwater depth fluctuated to increase and was mainly deeper than 3.3 m. Spatially, the area of the region where groundwater depth was deeper than 3.3 m increased from 46.7% in 1980 to 84% in 2000, while the area of the region almost occupied the whole region after 2000. Precipitation and evaporation changed little, while runoff decreased substantially. Shallow groundwater, change of cropland, grassland, and water body induced from human activities and decrease of runoff and increase of irrigation and water transfer from outer basin were the main reasons for land salinization before 2000. After 2000, groundwater with relatively great depth could not exert great influence on land salinization. Protection of grassland and wetland prevented the increase of the area of saline land. 展开更多
关键词 change detection hydrological process land cover land salinization Songnen Plain
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