广西土地生态系统水源涵养功能时空变化及其影响因素研究  

Study on Spatio⁃temporal Changes of Water Conservation Function of Land Ecosystem and Its Influencing Factors in Guangxi

作　　者：黄依平 杨小雄 HUANG Yi-ping;YANG Xiao-xiong(School of Natural Resources and Surveying,Nanning Normal University,Nanning,Guangxi 530001)

机构地区：[1]南宁师范大学自然资源与测绘学院,广西南宁530001

出　　处：《安徽农业科学》2025年第2期66-70,116,共6页Journal of Anhui Agricultural Sciences

摘　　要：[目的]研究广西土地生态系统水源涵养功能的时空变化和影响因素。[方法]基于InVEST模型的产水量模块和ArcGIS软件,定量评估广西2000、2010、2020年3个时期水源涵养功能时空变化,并利用地理探测器模型分析水源涵养功能的主要影响因素。[结果]2000—2020年广西土地生态系统水源涵养量为140.26×10^(8)~157.83×10^(8)m^(3),多年平均水源涵养量为148.99×10^(8)m^(3),时间尺度上呈现先增加后减少的态势,空间格局上呈现东北部高、西南部低的态势;2000—2020年广西各类土地的水源涵养功能排序依次为林地>耕地>草地>水域>建设用地>未利用地,土地利用类型面积的占比对水源涵养量有重要影响;单因子探测结果表明,广西土地生态系统水源涵养量的空间分布差异主要受土地利用类型、年蒸散量、高程的影响,而双因子探测结果则进一步揭示,土地利用类型和年降水量、年降水量和人口密度的交互作用对水源涵养量的空间分布变化影响尤为显著。[结论]广西土地生态系统水源涵养功能在时空上存在明显差异,继续实施退耕还林政策,进一步巩固已取得的成效,兼顾单因子和多因子作用的共同影响有利于广西更好地推进生态安全建设。[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 140.26×10^(8)-157.83×10^(8) m^(3),and the annual average water conservation was 148.99×10^(8) m^(3),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.

关 键 词：水源涵养功能 时空变化 影响因素 土地生态系统 InVEST模型 地理探测器 广西 

分 类 号：X171.1[环境科学与工程—环境科学]