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 ...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 4^(th),2018 to May 3^(rd),2019.The results showed thatthe 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.Therepresentative locations(RLs)varied in the different soil depths,which weretoe,upper and middle slope positions at 0~40,40~60 and 60~80 cm depthsof the investigated hillslope,respectively.Saturated hydraulic conductivity served as adominant factor controlling the temporal stability of SWC.The result advances our thorough understanding of hydrology and soil water resource in the Three Gorges region.展开更多
基金Financial support for this research was funded by Natural Science Foundation of China(No.41771261 and 41601215)Hubei Province Natural Science Foundation of China(No.2015CFA141 and 2016CFA027)Fundamental Research Funds for the Central Universities(No.CCNU18QN002 and CCNU17ZDJC06).
文摘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 4^(th),2018 to May 3^(rd),2019.The results showed thatthe 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.Therepresentative locations(RLs)varied in the different soil depths,which weretoe,upper and middle slope positions at 0~40,40~60 and 60~80 cm depthsof the investigated hillslope,respectively.Saturated hydraulic conductivity served as adominant factor controlling the temporal stability of SWC.The result advances our thorough understanding of hydrology and soil water resource in the Three Gorges region.
