水土保持通报2024，Vol.44Issue(3)：231-240,10.DOI:10.13961/j.cnki.stbctb.2024.03.024
2005-2020年甘肃省甘南州水源涵养功能时空变化及其驱动因素
Spatiotemporal Variation of Water Conservation Function and Its Driving Factors in Gannan Prefecture of Gansu Province During 2005-2020
摘要
Abstract
[Objective]Gannan Prefecture,Gansu Province,is an important water source conservation and supply area in the upper reaches of the Yangtze River and Yellow River,and it is also a crucial ecological security barrier of China.The spatial distribution pattern,temporal trend,and driving factors of water source conservation in Gannan Prefecture were studied to provide references and bases for regional water resource management and for promoting the development of healthy ecosystems.[Methods]The spatiotemporal characteristics of water source conservation in Gannan Prefecture from 2005 to 2020 were quantitatively analyzed based on the InVEST model,and an analysis of its driving factors was conducted using the geographic detector model.[Results]① The average annual water source conservation depth and total conservation volume in Gannan Prefecture were 25.77 mm and 9.45×10 8 m3,respectively.The overall spatial pattern showed higher values in the southern part and lower values in the northern part of the study area.Grassland and forestland dominated the water source conservation function,accounting for 65.92％and 29.43％,respectively,of the total water conservation capacity.② Over the 16-year study period,water source conservation showed an overall increasing trend,with an average growth rate of 1.10 mm/yr.In terms of administrative divisions,areas with high water source conservation values were mainly located in the southern part of Maqu,the southern part of Diebu,and Zhouqu.In terms of topographic factors,high values were mainly concentrated in the elevation range of 3 000-4 000 m and in the slope range of 8°-25°.③ The geographic detector analysis found that precipitation was the main factor affecting the temporal variation of water source conservation in the study area,while precipitation and land use were the dominant factors influencing the spatial distribution of water source conservation.[Conclusion]Water source conservation in Gannan Prefecture exhibited obvious temporal evolution laws and spatial distribution patterns.The dual influence of natural factors(mainly precipitation)and human activities(mainly land use)was the main driving force affecting spatiotemporal changes in water source conservation.关键词
甘肃省甘南州/水源涵养/InVEST模型/时空变化/地理探测器Key words
Gannan Prefecture of Gansu Provicne/water conservation/In VEST model/spatiotemporal changes/geographic detector分类
农业科技引用本文复制引用
刘志春,曹文侠,王正文,王世林,王俊杰,陈新栋..2005-2020年甘肃省甘南州水源涵养功能时空变化及其驱动因素[J].水土保持通报,2024,44(3):231-240,10.基金项目
国家自然科学基金联合基金项目"青藏高原高寒草甸冷季补饲放牧牦牛的生态系统效应与机理"(U21A20242) （U21A20242）
