Study on Spatio-temporal Changes of Water Conservation Function of Land Ecosystem and Its Influencing Factors in Guangxi
[Objective]To study the spatio-temporal changes and influencing factors of water conservation function of land ecosystem in Guan-gxi.[Method]Based on the water production module of InVEST model and ArcGIS software,the spatio-temporal changes of water conservation function in Guangxi in 2000,2010 and 2020 were quantitatively evaluated,and the main influencing factors of water conservation function were analyzed by using the geographical detector model.[Result]From 2000 to 2020,the water conservation of land ecosystem in Guangxi was 140.26×108-157.83×108 m3,and the annual average water conservation was 148.99×108 m3,showing a trend of first increase and then de-crease on the time scale,and the spatial pattern was higher in the northeast and lower in the southwest.The ranking of the water retention func-tion of various land types in Guangxi from 2000 to 2020 was forestland＞arable land＞grassland＞waters＞construction land＞unused land.The pro-portion of land use types had an important impact on water retention capacity.The single factor detection results indicated that the spatial distri-bution differences of water source conservation capacity in Guangxi's land ecosystem were mainly influenced by land use types,annual evapora-tion and elevation.The dual factor detection results further revealed that the interaction between land use types and annual rainfall,as well as the interaction between annual rainfall and population density,had a particularly significant impact on the spatial distribution changes of water source conservation capacity.[Conclusion]The water conservation function of land ecosystem in Guangxi was obviously different in time and space.Continuing to implement the policy of returning farmland to forest,further consolidating the achieved results,and taking into account the combined effects of single factor and multiple factor are conducive to better promoting the construction of ecological security in Guangxi.
Water conservation functionSpatio-temporal changeInfluencing factorLand ecosystemInVEST modelGeographic detectorGuangxi
万方数据
维普
