【摘 要】
：
Soil water content(SWC)plays a crucial role in simulating hydrological process,guiding reforestation and controlling soil erosion in mountainous regions.Spatial-temporal variability of SWC increases the difficulty of quantifying SWC pattern in the predict
【机 构】
：
Hubei Province Laboratory for Geographical Process Analyzing&Modeling,Wuhan 430079,China;College of
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Soil water content(SWC)plays a crucial role in simulating hydrological process,guiding reforestation and controlling soil erosion in mountainous regions.Spatial-temporal variability of SWC increases the difficulty of quantifying SWC pattern in the prediction of soil moisture.Temporal stability analysis of SWC can reduce the labor consuming and simplify the costly field monitoring.This study aimed to evaluate the temporal stability of SWC at hourly,daily and monthly temporal periods and its controlling factors at a hillslope in the Three Gorges region.The SWC of five soil depths was monitored at 5 topographic locations(toe,lower,middle,upper and top slope positions)along a 170 m hillslope in the Three Gorges region(110°04\'～112°04\'E,29°53\'～31°34\'N),Yichang City,Hubei Province,China from May 4th,2018 to May 3rd,2019.The results showed that the coefficient of variation of SWC ranged from 4％to 49％,which increased with rising soil depth within 40 cm but thereafter decreased.However,the high Spearman\'s rank coefficients(P＜0.05)indicated strong temporal stability at three temporal periods.The representative locations(RLs)varied in the different soil depths,which were toe,upper and middle slope positions at 0～40,40～60 and 60～80 cm depths of the investigated hillslope,respectively.Saturated hydraulic conductivity served as a dominant factor controlling the temporal stability of SWC.The result advances our thorough understanding of hydrology and soil water resource in the Three Gorges region.
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