水土保持研究2025，Vol.32Issue(3)：28-35,54,9.DOI:10.13869/j.cnki.rswc.2025.03.007
滦河流域水文连通性时空变化及其影响因素
Spatiotemporal variation of hydrological connectivity in the Luanhe River Basin and its influencing factors
摘要
Abstract
[Objective]This study aims to quantify the spatiotemporal variations of water-sediment connectivity in the mountainous areas of the Haihe River Basin from 2000 to 2019 in China and investigate the influence of land-use variations on hydrological connectivity,providing new insights into water-sediment management in the mountainous regions of the Haihe River Basin.[Methods]Two hydrological connectivity indexes(IC)based on the vegetation factor(C)of the Universal Soil Loss Equation and the normalized difference vegetation index(NDVI)were employed to quantify hydrological connectivity at an annual scale in the Luanhe River Basin.[Results](1)From 2000 to 2019,the mean values of ICc in the controlled basin of the Luanxian hydrological station were-1.41,-1.41,-1.41,-1.39,-1.38,and the mean values of ICndvi were-2.14,-2.33,-2.56,-2.36,and-2.28.The spatial distribution patterns of ICc and ICndvi were similar,both presenting upstream<midstream<downstream,with lower values in the northwest and higher values in the southeast.(2)The percentage of area with IC index changes in the Luanhe River Basin was as follows:non-significant decrease>non-significant increase>significant decrease>significant increase,with 52.39%of the area showing non-significant decrease,and 38.67%showing non-significant increase.The areas with decreasing connectivity were located in the western upstream,midstream,and eastern downstream areas,while areas with increasing connectivity were mainly in the middle and lower reaches,such as near Chengde and Qian'an.The ICndvi index was better than the ICc index in depicting hydrological connectivity and its significant changes.(3)Both ICc and ICndvi showed significant positive correlations with annual runoff depth and annual sediment modulus(correlation coefficients of 0.6 and 0.7,respectively).(4)The calculated mean ICndvi values for different land types,from high to low,were as follows:bare land 0.98,building-0.17,farmland-2.13,forest-2.54,grassland-2.78,shrubland-3.00,wetland-3.80,water body-3.98.[Conclusion]With the implementation of projects such as Grain for Green,the hydrological connectivity of the Luanhe River Basin has not significantly decreased over the past 20 years.The major land-use changes from farmland and grassland to forests and buildings has resulted in a decrease in ICndvi for forests and farmland,and an increase in ICndvi for grasslands and buildings.关键词
水文连通/IC指数/滦河流域/径流泥沙/土地利用Key words
hydrological connectivity/IC index/Luanhe River Basin/runoff sediment/land use分类
农业科技引用本文复制引用
李雪涵,王阳阳,崔旭辉,贾国栋,余新晓..滦河流域水文连通性时空变化及其影响因素[J].水土保持研究,2025,32(3):28-35,54,9.基金项目
国家自然科学基金(42230714) （42230714）
国家自然科学基金(42277062) （42277062）
国家自然科学基金(41977149) （41977149）
