Evaluation of the water conservation function in the Ili River Delta of Central Asia based on the InVEST model  

作　　者：CAO Yijie MA Yonggang BAO Anming CHANG Cun LIU Tie 

机构地区：[1]College of Geography and Remote Sensing Sciences,Xinjiang University,Urumqi 830046,China [2]Xinjiang Key Laboratory of Oasis Ecology,Xinjiang University,Urumqi 830046,China [3]College of Ecology and Environment,Xinjiang University,Urumqi 830046,China [4]Xinjiang Jinghe Observation and Research Station of Temperate Desert Ecosystem,Ministry of Education,Jinghe 833300,China [5]Key Laboratory of Oasis Ecology of Education Ministry,Urumqi 830046,China [6]State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China [7]University of Chinese Academy of Sciences,Beijing 100049,China [8]Key Laboratory of GIS&RS Application,Xinjiang Uygur Autonomous Region,Urumqi 830011,China

出　　处：《Journal of Arid Land》2023年第12期1455-1473,共19页干旱区科学（英文版）

基　　金：funded by the National Natural Science Foundation of China(42071245);the Xinjiang Uygur Autonomous Region Innovation Environment Construction Special Project&Science and Technology Innovation Base Construction Project(PT2107);the Third Xinjiang Comprehensive Scientific Survey Project Sub-topic(2021xjkk140305);the Tianshan Talent Training Program of Xinjiang Uygur Autonomous Region(2022TSYCLJ0011);the K.C.Wong Education Foundation(GJTD-2020-14).

摘　　要：The Ili River Delta(IRD)is an ecological security barrier for the Lake Balkhash and an important water conservation area in Central Asia.In this study,we selected the IRD as a typical research area,and simulated the water yield and water conservation from 1975 to 2020 using the water yield module of the Integrated Valuation of Ecosystem Services and Tradeoffs(InVEST)model.We further analyzed the temporal and spatial variations in the water yield and water conservation in the IRD from 1975 to 2020,and investigated the main driving factors(precipitation,potential evapotranspiration,land use/land cover change,and inflow from the Ili River)of the water conservation variation based on the linear regression,piecewise linear regression,and Pearson's correlation coefficient analyses.The results indicated that from 1975 to 2020,the water yield and water conservation in the IRD showed a decreasing trend,and the spatial distribution pattern was"high in the east and low in the west";overall,the water conservation of all land use types decreased slightly.The water conservation volume of grassland was the most reduced,although the area of grassland increased owing to the increased inflow from the Ili River.At the same time,the increased inflow has led to the expansion of wetland areas,the improvement of vegetation growth,and the increase of regional evapotranspiration,thus resulting in an overall reduction in the water conservation.The water conservation depth and precipitation had similar spatial distribution patterns;the change in climate factors was the main reason for the decline in the water conservation function in the delta.The reservoir in the upper reaches of the IRD regulated runoff into the Lake Balkhash,promoted vegetation restoration,and had a positive effect on the water conservation;however,this positive effect cannot offset the negative effect of enhanced evapotranspiration.These results provide a reference for the rational allocation of water resources and ecosystem protection in the IRD.

关 键 词：water conservation function water yield Integrated Valuation of Ecosystem Services and Tradeoffs(InVEST)model climate change land use/land cover change(LUCC) Ili River Delta Lake Balkhash 

分 类 号：X826[环境科学与工程—环境工程] TV213.4[水利工程—水文学及水资源]