摘要
研究延河流域水沙变化对降水和土地利用变化的响应及内在机制,对流域的生态安全和高质量发展具有重要意义。利用延河流域降水、径流和输沙以及土地利用数据,运用突变检验和双累积曲线法等方法,分析降水和土地利用变化与水沙之间的关系,结果表明:延河流域降水随时间变化呈不明显减小趋势,而径流和输沙随时间变化却呈显著减小趋势。延河流域整体土地利用结构是以耕地、草地和林地为主的土地利用类型,但在面积量发生显著变化,主要表现为草地、林地面积增加,耕地面积减少。径流和输沙都是在1986年发生由丰到枯的突变。人类活动影响下的土地利用变化是造成延河流域水沙减少的主要因素,其对径流和输沙的贡献率分别为80.61%和91.86%,而降水的贡献率仅为19.39%和8.14%。
Studies of response and internal mechanism of water and sediment change to precipitation and land use change in the Yanhe river basin are of great significances for the ecological security and high-quality development of the basin.Using the precipitation,runoff and sediment transport and land use data of Yanhe river basin,and the method of mutation test and double mass curve method,the rainfall and land use change and the relationship between the water and sediment were analyzed.Results showed that the precipitation change in Yanhe river basin appearred not obvious decreasing trend with time,but runoff and sediment transport decreased significantly with time.The overall land use structure of Yanhe river basin was mainly composed of cultivated land,grassland and woodland,but therewere significant changes in the area,mainly in the increase of grassland and woodland area,and the decrease of cultivated land area.The abrupt changes of runoff and sediment transport from abundant to dry occurred in 1986.The land use change under the influence of human activities was the main factor causing the reduction of runoff and sediment in the Yanhe river basin.The contribution rates of the land use change to runoff and sediment transport were 80.61% and 91.86%,respectively,while the contribution rates of precipitation were only 19.39% and 8.14%,respectively.
作者
刘强
穆兴民
赵广举
高鹏
孙文义
南岭
LIU Qiang;MU Xingmin;ZHAO Guangju;GAO Peng;SUN Wenyi;NAN Ling(Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling 712100;Institute of Soil and Water Conservation,Northwest A&F University,Yangling712100;College of Resources and Environmental Engineering,Tianshui Normal university,Tianshui 741000,China)
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2021年第7期129-135,共7页
Journal of Arid Land Resources and Environment
基金
国家自然科学基金(42077075)资助。
关键词
延河流域
降水
土地利用变化
径流量
输沙量
Yanhe river basin
precipitation
land use change
runoff
sediment
