水土保持研究2026，Vol.33Issue(2)：42-49,8.DOI:10.13869/j.cnki.rswc.2026.02.039
黄土丘陵区天然植被坡面土壤水分变化对次降雨过程的响应
Response of soil moisture variation of natural vegetation slopes to individual rainfall in loess hilly-gully region
摘要
Abstract
[Objective]Studying the dynamic variation process of soil moisture on natural vegetation slopes in the loess hilly-gully region is important for quantitatively evaluating vegetation's hydrological effects.[Methods]Bare land,shrubland,and grassland slopes in Luoyugou watershed of Tianshui City were selected as study sites.Continuous monitoring throughout the rainfall process was conducted using moisture meters based on artificial simulated rainfall.The dynamic variation characteristics of soil moisture on differently covered slopes with rainfall duration were analyzed,and the spatial distribution patterns of soil moisture at different depths and slope positions were elucidated.[Results]The mean soil moisture contents of bare land,shrubland,and grassland were 23.6%,26.0%and 36.7%respectively,indicating that vegetation cover significantly enhanced soil water retention capacity.The variation coefficients of bare land,shrubland,and grassland were 31.0%,37.0%and 18.0%respectively,demonstrating that grassland slopes exhibited the lowest spatial heterogeneity of soil moisture.Vertical changes of soil moisture in grassland and shrubland generally showed steady growth with increasing soil depth,while bare land exhibited an initial increase followed by decrease,with enhanced spatial heterogeneity in deep soil layers.Significant spatial variability in soil moisture was observed at different slope positions(p<0.05),showing drastic changes at upper slopes but relatively stable conditions at middle and lower slopes.[Conclusion]Vegetation-covered slopes exhibit higher mean soil moisture content than bare land during rainfall.Soil moisture variability gradually decreases with increasing soil depth across cover types,with middle and lower slope positions demonstrating greater stability in moisture dynamics compared to upper slopes.Grassland and shrubland increase soil moisture storage capacity on slopes,providing a scientific basis for optimal allocation of forestry and grassland measures in the loess hilly-gully region.关键词
土壤水分/动态变化/天然植被/野外模拟降雨/黄土丘陵区Key words
soil moisture/dynamic variation/natural vegetation/field rainfall simulation/loess hilly-gully region分类
农业科技引用本文复制引用
何文文,肖培青,何子淼,王靖淑..黄土丘陵区天然植被坡面土壤水分变化对次降雨过程的响应[J].水土保持研究,2026,33(2):42-49,8.基金项目
国家自然科学基金(U2243210) （U2243210）
河南省自然科学基金(252300421756,252300420859) （252300421756,252300420859）
黄河水利科学研究院科技发展基金(黄科发202312) （黄科发202312）
