Evaluation of Water Conservation Function in Xiong'an New District Based on Comprehensive Index Method

Water resources are the basis for human survival and development. With the rapid development of socio-economic, how to solve the problem of water scarcity is imminent. Water conservation is one of the important service functions of ecosystems. Understanding the dynamic changes of water conservation functions in a timely manner is conducive to the protection and reconstruction of water resources.Based on remote sensing data, meteorological data and LUCC data, this paper establishes a water conservation function evaluation model from the perspective of natural ecological environment and human activity interference, and uses this model to analyze the evolution process and spatial pattern distribution of water conservation functions of Xiong'an New District from 2005 to 2015. The main results are as follows:

(1) The land cover type changes in Xiong'an New District were analyzed based on LUCC data from 1995 to 2015. It was found that cultivated land was always the most important land cover type, and the area change tends to be stable; the construction land has increased dramatically; the area of water and wetland has gradually decreased and then gradually increased.

(2) Based on the "Technical Specifications for Assessment of Ecological Environment", combined with the characteristics of natural ecology and human activities in Xiong'an New District, the theory of water balance method was added to design a set comprehensive evaluation system.The comprehensive index method was used to evaluate the water conservation function of Xiong'an New District from 2005 to 2015. The results show that the water conservation function was the best in 2015 and the worst in 2010. The overall ecological environment of Xiong'an New District improved during 2005-2015. Among the evaluation indicators, the index of precipitation compliance rate fluctuated the most, followed by the changes of evapotranspiration index, TVDI and landscape fragmentation; the changes of other indicators were relatively stable.This study has important practical significance for the utilization and protection of water resources in Xiong'an New District.