To comprehensively evaluate the alterations in water ecosystem service functions within arid watersheds,this study focused on the Bosten Lake Basin,which is situated in the arid region of Northwest China.The research ...To comprehensively evaluate the alterations in water ecosystem service functions within arid watersheds,this study focused on the Bosten Lake Basin,which is situated in the arid region of Northwest China.The research was based on land use/land cover(LULC),natural,socioeconomic,and accessibility data,utilizing the Patch-level Land Use Simulation(PLUS)and Integrated Valuation of Ecosystem Services and Tradeoffs(InVEST)models to dynamically assess LULC change and associated variations in water yield and water conservation.The analyses included the evaluation of contribution indices of various land use types and the investigation of driving factors that influence water yield and water conservation.The results showed that the change of LULC in the Bosten Lake Basin from 2000 to 2020 showed a trend of increasing in cultivated land and construction land,and decreasing in grassland,forest,and unused land.The unused land of all the three predicted scenarios of 2030(S1,a natural development scenario;S2,an ecological protection scenario;and S3,a cultivated land protection scenario)showed a decreasing trend.The scenarios S1 and S3 showed a trend of decreasing in grassland and increasing in cultivated land;while the scenario S2 showed a trend of decreasing in cultivated land and increasing in grassland.The water yield of the Bosten Lake Basin exhibited an initial decline followed by a slight increase from 2000 to 2020.The areas with higher water yield values were primarily located in the northern section of the basin,which is characterized by higher altitude.Water conservation demonstrated a pattern of initial decrease followed by stabilization,with the northeastern region demonstrating higher water conservation values.In the projected LULC scenarios of 2030,the estimated water yield under scenarios S1 and S3 was marginally greater than that under scenario S2;while the level of water conservation across all three scenarios remained rather consistent.The results showed that Hejing County is an important water conservation function zone,and the eastern part of the Xiaoyouledusi Basin is particularly important and should be protected.The findings of this study offer a scientific foundation for advancing sustainable development in arid watersheds and facilitating efficient water resource management.展开更多
以Landsat5/7/8系列遥感影像为数据源,利用归一化差异水体指数(Normalized difference water index,NDWI)、改进的归一化差异水体指数(Modified normalized difference water index,MNDWI)、自动水体指数(Automated water extraction in...以Landsat5/7/8系列遥感影像为数据源,利用归一化差异水体指数(Normalized difference water index,NDWI)、改进的归一化差异水体指数(Modified normalized difference water index,MNDWI)、自动水体指数(Automated water extraction index,AWEI)、改进的自动水体指数(Modified automated water extraction index,MAWEI)提取艾比湖水体,建立混淆矩阵对4种水体指数提取结果进行对比分析,利用精度最高指数提取艾比湖面积并通过动态度分析湖泊面积变化趋势,同时对艾比湖面积变化的驱动因素进行分析。结果表明:MAWEI指数精度最高,精度达到95%以上,Kappa系数>0.94。2000—2003年期间,艾比湖面积从768.93 km^(2)增加至982.27 km^(2),湖泊面积增加27.74%、动态度为9.24%;2003—2014年期间,湖泊面积减至447.08 km^(2),湖泊面积缩减54.48%、动态度为-4.95%;2014—2018年期间,湖泊面积再次增加至852.77 km^(2),湖泊面积增加90.74%、动态度为22.68%;2018-2020年湖泊面积减至593.79 km^(2),湖泊面积缩减30.36%、动态度为-15.18%,总的来说近20 a艾比湖面积变化呈现先扩张再退缩的趋势。湖泊面积变化与年均降水量呈正相关,与蒸发量呈负相关,与博尔塔拉河和精河径流量呈正相关。水资源的减少及其周围人口、灌溉面积及生产值持续增长引起经济社会总用水量的激增,对湖泊面积变化产生一定的影响。研究成果对艾比湖生态环境保护有一定参考意义。展开更多
基金This research was supported by the Special Project for the Construction of Innovation Environment in the Autonomous Region(2022D04007)the National Natural Science Foundation of China(42361030).
文摘To comprehensively evaluate the alterations in water ecosystem service functions within arid watersheds,this study focused on the Bosten Lake Basin,which is situated in the arid region of Northwest China.The research was based on land use/land cover(LULC),natural,socioeconomic,and accessibility data,utilizing the Patch-level Land Use Simulation(PLUS)and Integrated Valuation of Ecosystem Services and Tradeoffs(InVEST)models to dynamically assess LULC change and associated variations in water yield and water conservation.The analyses included the evaluation of contribution indices of various land use types and the investigation of driving factors that influence water yield and water conservation.The results showed that the change of LULC in the Bosten Lake Basin from 2000 to 2020 showed a trend of increasing in cultivated land and construction land,and decreasing in grassland,forest,and unused land.The unused land of all the three predicted scenarios of 2030(S1,a natural development scenario;S2,an ecological protection scenario;and S3,a cultivated land protection scenario)showed a decreasing trend.The scenarios S1 and S3 showed a trend of decreasing in grassland and increasing in cultivated land;while the scenario S2 showed a trend of decreasing in cultivated land and increasing in grassland.The water yield of the Bosten Lake Basin exhibited an initial decline followed by a slight increase from 2000 to 2020.The areas with higher water yield values were primarily located in the northern section of the basin,which is characterized by higher altitude.Water conservation demonstrated a pattern of initial decrease followed by stabilization,with the northeastern region demonstrating higher water conservation values.In the projected LULC scenarios of 2030,the estimated water yield under scenarios S1 and S3 was marginally greater than that under scenario S2;while the level of water conservation across all three scenarios remained rather consistent.The results showed that Hejing County is an important water conservation function zone,and the eastern part of the Xiaoyouledusi Basin is particularly important and should be protected.The findings of this study offer a scientific foundation for advancing sustainable development in arid watersheds and facilitating efficient water resource management.