土地利用变化对流域水量供给和洪水调节服务的影响
Impact of land use changes on freshwater provision and flood regulation services in watersheds
刘文倩 1李萍 1乔子戌 2谢展 1唐莉华3
作者信息
- 1. 西北农林科技大学 水利与建筑工程学院,陕西 杨凌 712100
- 2. 内蒙古农业大学 水利与土木建筑工程学院,内蒙古 呼和浩特 010018
- 3. 清华大学 水利水电工程系,北京 100084;清华大学 水圈科学与水利工程全国重点实验室,北京 100084
- 折叠
摘要
西辽河流域属于典型生态脆弱区和敏感区,研究土地利用变化对水量供给和洪水调节服务的影响,对于流域水资源可持续利用及生态保护具有重要意义.本研究运用构建的分布式水文模型(GBHM),结合生态系统服务指数评价法,分析了西辽河流域1990-2020年水量供给(FWPI)和洪水调节服务(FRI)的时空演变特征,并深入探讨了草地、耕地及林地等不同土地类型变化对两种生态系统服务的影响.研究结果表明,FWPI 整体显著下降(P<0.05),FRI显著上升(P<0.05).下游地区FWPI和FRI均高于上游.大多数子流域2005-2020年的FWPI较2005 年之前有所减少(0%～42%),FRI较2005 年之前有所增加(0%～73%).草地和耕地面积减少、林地面积增加,均导致各代表性子流域水量供给服务减少,但一定程度上提升了洪水调节服务.
Abstract
West Liao River Basin(WLRB)is a typical region that is fragile and sensitive ecologically.It is important to study the impact of its land use changes on freshwater provision and flood regulation for sustainable utilization of its water resources and ecological protection.This paper presents an analysis on the spatial and temporal evolution characteristics of freshwater provision and flood regulation services in the basin in 1990-2020,using a distributed hydrological model(GBHM)developed for WLRB,in combination with an index-based ecosystem service approach.We discuss in depth the impacts of the changes in different land types-such as grassland,farmland and forest-on the two eco-hydrological service functions.The results show that in this period,overall freshwater provision services decreased significantly(P<0.05),while flood regulation services increased significantly(P<0.05).Both services are higher in the downstream than those in the upstream.In the period of 2005-2020,freshwater provision services in most sub-watersheds were 0%-42%lower than those in its previous period,while flood regulation services were 0%-73%higher than the previous values.In representative sub-watersheds,the decreases in grassland and farmland areas and the increase in forested land area resulted in a decrease in freshwater provision services,but enhanced flood regulation service functions to a certain degree.
关键词
西辽河流域/土地利用/水量供给服务/洪水调节服务/分布式水文模型Key words
West Liao River basin/land use/freshwater provision service/flood regulation service/distributed hydrologic model引用本文复制引用
出版年
2025
国家科技期刊平台
NSTL
万方数据