干旱区地理2025，Vol.48Issue(3)：380-390,11.DOI:10.12118/j.issn.1000-6060.2024.179
秦岭山区-黄土高原地区生态基流区域差异及其阈值研究
Regional differences and threshold of ecological base flow in the Qinling Mountains-Loess Plateau region
摘要
Abstract
The Qinling Mountains-Loess Plateau geological and geomorphological continuum features a fragile ecosystem where river ecological base flow and its thresholds are critical for ecosystem protection.This study ex-amines the Qinling Mountains-Loess Plateau region in China,constructing a system of 22 ecological base flow in-fluencing factors,including climate,vegetation,topography,soil structure,watershed morphology,and socio-eco-nomic variables.Using a self-organizing map(SOM)neural network and K-means clustering analysis,the region was divided into four sub-regions:the central Loess Plateau,southern Qinling,northern Qinling,and northwest-ern Loess Plateau.Partial least squares structural equation modeling(PLS-SEM)was applied to model and ana-lyze ecological base flow influencing factors in three sub-regions.The results indicate that:(1)Ecological base flow is primarily influenced by precipitation concentration in the central Loess Plateau,by annual mean tempera-ture in the southern Qinling,and by soil moisture content in the northern Qinling.(2)Significant regional differ-ences were observed in ecological base flow thresholds,with values of 7.9%for the central Loess Plateau,9.5%for the southern Qinling,7.5%for the northern Qinling,and 4.1%for the northwestern Loess Plateau.(3)A linear regression model was developed to calculate and simulate ecological base flow,with determination coefficients exceeding 0.87,accounting for regional differences in environmental response.These findings provide a robust scientific basis for the quantitative estimation of ecological base flow,offer insights into river health maintenance and sustainable water resource utilization,and hold substantial theoretical and practical significance.关键词
生态基流/聚类分析/流量阈值/结构方程/影响因素Key words
ecological base flow/cluster analysis/flow threshold/structural equation/influencing factors引用本文复制引用
杨晓亚,于坤霞,李占斌,李鹏,刘永刚,莫淑红,杨建宏..秦岭山区-黄土高原地区生态基流区域差异及其阈值研究[J].干旱区地理,2025,48(3):380-390,11.基金项目
陕西省重点研发计划项目(2023-ZDLSF-60) （2023-ZDLSF-60）
国家自然科学基金项目(52079104) （52079104）
宁夏水利科学研究院项目(SKYZY-2024005) （SKYZY-2024005）
陕西省青年科技新星项目(2024ZC-KJXX-058)资助 （2024ZC-KJXX-058）
