生态环境学报2024，Vol.33Issue(5)：802-811,10.DOI:10.16258/j.cnki.1674-5906.2024.05.013
秦岭北麓典型流域径流对气候和土地利用变化的响应
Impacts of Climate and Land Use Change on Runoff in Typical Basin of Northern Foothills of Qinling Mountains:Case Study of Bahe River Basin
摘要
Abstract
The impacts of climate and land use changes on runoff variation were significant.The Bahe River Basin was selected as the study area to explore the characteristics and response mechanisms of runoff variation in a typical urban watershed at the northern foot of the Qinling Mountains under the influence of both factors.Hydrometeorological data from 1960 to 2018 and land use data from 1985 to 2018 in the Bahe River Basin,methods including the sliding T-test,Trend-Free Pre-Whitening Mann-Kendall(TFPW-MK)rank test,Continuous Wavelet Transform(CWT),Cross Wavelet Transform(XWT),and Wavelet Transform Coherence(WTC),were employed to study the characteristics of hydrological,meteorological,and underlying surface element changes in the watershed,as well as the resonance periods,correlations,and temporal characteristics of watershed runoff and meteorological elements.Additionally,the Soil and Water Assessment Tool(SWAT)model was used to explore the response mechanisms of watershed runoff to climate and land-use changes under various scenarios.The results indicate that 1)from 1960 to 2018,runoff in the Bahe River Basin showed a significant decreasing trend,while urban construction land increased nearly threefold,and the area of cultivated land decreased from 1985 to 2018.2)In the time-frequency domain,runoff and meteorological factors exhibited resonance periods and time lag effects at different scales.Precipitation and runoff showed five significant resonance periods in the high-energy area,whereas temperature and runoff presented three significant resonance periods,with runoff lagging behind changes in meteorological factors.3)Annual runoff was positively correlated with precipitation and negatively correlated with temperature.Precipitation is the dominant factor affecting watershed runoff,and under scenarios of increased precipitation,the sensitivity of runoff to precipitation changes was higher than that under scenarios of decreased precipitation.The conversion of cultivated land to forest land may lead to a 2.58%decrease in annual runoff,whereas the conversion of grasslands to forests may increase annual runoff by 0.822%.The conversion of all cultivated land to urban construction land may increase annual runoff by 40.8%.4)Under the combined effects of climate and land use changes,the variation range of runoff in the Bahe River basin was-0.870 m3∙s-1,with climate change causing a variation range of-1.04 m3∙s-1,and land use change causing a variation range of 0.170 m3∙s-1.Compared with land-use change,climate change had a more significant impact on runoff variation in the Bahe River Basin.关键词
气候变化/土地利用变化/交叉小波变换/小波相干/径流/SWAT模型/灞河流域Key words
climate change/land use change/cross wavelet transform/wavelet coherence/runoff/SWAT model/Bahe River basin分类
资源环境引用本文复制引用
李慧,邓佳伟,李亚鑫,母滢琦..秦岭北麓典型流域径流对气候和土地利用变化的响应[J].生态环境学报,2024,33(5):802-811,10.基金项目
国家自然科学基金项目(42007186) （42007186）
