| Water resources are the material basis for the development of human society.They play an indispensable role in human production and life,and are crucial to the healthy development of ecosystem services.However,with the rapid development of society and economy,the damage degree of water conservation services increases,which indirectly affects the development of ecosystem and is not conducive to the sustainable development of regional society and economy.In recent years,the study of ecosystem water conservation services has become a hot topic in ecology and other fields.Liaoning province,as the opening window of northeast economy,has developed rapidly.At the same time,the demand for production and domestic water is increasing,urbanization and industrial agglomeration,water pollution is aggravated,and the water conservation function is affected.In this paper,In VEST model was used to evaluate water supply in Liaoning Province from 2001 to 2020,and its spatial-temporal variation characteristics and main influencing factors were revealed.On this basis,the function of water conservation in Liaoning province is evaluated,and the functional importance is divided,and the status and influencing factors of water conservation in Liaoning province are comprehensively analyzed.The main conclusions are as follows:（1）From 2001 to 2020,the average annual water supply in Liaoning province was177.22 mm,showing no significant growth trend in general.In 2010,water supply was the highest（412.73mm）,and in 2014,water supply was the lowest（76.47mm）.The spatial variation of water supply decreased from east to west,and dandong and Benxi were high value areas,while Chaoyang,Huludao and Jinzhou were low value areas.（2）The water supply per unit area of each land use type in Liaoning province is in the order of construction land > woodland > cultivated land > unused land > grassland > water area.The total water supply per unit area of each land use type in Liaoning Province is in the order of cultivated land > woodland > construction land > grassland > water area > unused land.（3）Water supply has the strongest correlation with climate factors,the stronger correlation with land use type factors,and the weakest correlation with social and economic factors.Climate factors and land use type factors are the leading factors affecting the spatial differentiation of water supply in Liaoning Province,and the explanatory power of multifactor interaction is mostly higher than that of single factor.（4）During the study period,the comprehensive score of water conservation function in Liaoning province showed a fluctuating upward trend,and the water conservation function recovered to a certain extent.The spatial distribution characteristics are strong in the north and weak in the south,strong in the east and weak in the west.Extremely important areas are distributed in Dandong,Tieling,generally important areas are distributed in Dalian and Panjin.During the study period,the water conservation function of Liaoyang,Anshan and Yingkou increased,while the water conservation function of Huludao,Shenyang city and Benxi weakened,while the other cities did not change significantly.（5）Water supply,vegetation coverage and water production coefficient are the main positive indexes affecting the change of water conservation function in Liaoning Province,and they account for a large proportion,which is beneficial to the restoration of water conservation function in Liaoning Province.Agricultural irrigation water consumption rate,land fragmentation degree and fertilizer intensity were the largest weight values of the reverse indexes,which were not conducive to the restoration of water conservation function.Water supply,vegetation coverage and water production coefficient are the main indexes that affect the spatial change of water conservation function in Liaoning Province. |
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