Spatio-temporal uneven distribution of soil moisture replenishment by rainfall events along a hillslope in the Liupan Mountains, Northwest China  

作　　者：BAI Yushi YU Pengtao WAN Yanfang LIU Bingbing WANG Yanhui LIU Zebin Ashley A.WEBB 

机构地区：[1]Ecology and Nature Conservation Institute,Chinese Academy of Forestry,Beijing 100091,China [2]Liupan Mountains Forest Ecosystem Positioning Observation and Research Station of Ningxia,Guyuan 756400,China [3]Water NSW,Tamworth NSW 2340,Australia

出　　处：《Journal of Mountain Science》2025年第4期1376-1387,共12页山地科学学报(英文)

基　　金：financially supported by the Central Public-Interest Scientific Institution Basal Research Fund of Chinese Academy of Forestry(CAFYBB2021ZW002);the National Key Research and Development Program of China(2022YFF1300404);the National Natural Science Foundation of China(U21A2005)。

摘　　要：Mountainous areas are the priority for forest restoration in semiarid regions,with hillslopes serving as the basic units of mountains.Precipitation is the only water source in these regions,and the uneven distribution of hillslope soil moisture replenishment after precipitation determines vegetation survival and growth.Therefore,in this study experiments were performed on a hillslope in the Liupan Mountains,Ningxia Hui Autonomous Region,China,to quantify the unevenness of soil moisture replenishment.Soil water content(SWC)in the 0–60 cm layer and precipitation were monitored throughout the growing season in 2020 and 2021.The results showed that(1)Annual soil moisture replenishment was the highest at the mid-slope position,with an average of 309.9 mm,especially under moderate and heavy rain grade conditions,reaching 38.7% and 30.8% of the total replenishment,respectively;(2)Vertical replenishment played a dominant role in the total replenishment,accounting for 82.8%;lateral replenishment played an important but lesser role,accounting for up to 17.2% of the total replenishment;(3)Based on a soil moisture replenishment model established in this study,the maximal replenishment occurred at 90 m from the top of the slope;(4)The dominant factors contributing to the soil moisture replenishment were rainfall amount and saturated hydraulic conductivity(Ks).These findings suggest that attention should be given to both vertical and lateral soil moisture replenishment,and the mid-slope position could be preferred for site selection to achieve precise and integrated forest-water management on hillslopes in semi-arid mountainous regions.

关 键 词：Soil moisture replenishment Lateral replenishment Hillslope position Loess Plateau 

分 类 号：S152.7[农业科学—土壤学]