Abstract
The temporal and spatial variation characteristics of soil moisture in typical slope and gully of Jiulongquangou small watershed were studied in the hilly and gully region of the Loess Plateau of China. The variation of soil moisture in the 0-30 cm layer on the surface of the hilly and gully region of the Loess Plateau is greater than the variation of soil moisture in each layer between 40 and 100 cm. In the study area, the model parameters such as coefficient of variation (Cv), nugget (C0), sill (C0+C), spatial degrees of freedom(C0/(C+C0)) and variable change can be used to quantitative analysis the spatial varying law. On the slope surface, the average soil water content and the coefficient of variation are negatively correlated, and can be approximated by an exponential function, while the two are positively correlated in the gully.
Highlights
As an important variable for understanding and predicting a range of hydrological processes including flooding, erosion, solute transport and land-atmosphere interactions, soil moisture profoundly affects the ecological environment construction and specific farm planning and management[1,2,3]
From that we get that the variation of soil moisture in the 0-30 cm layer on the surface of the hilly and gully region of the Loess Plateau is greater than the variation of soil moisture in each layer between 40 and 100 cm
The average soil water content increases with the depth of the soil layer
Summary
As an important variable for understanding and predicting a range of hydrological processes including flooding, erosion, solute transport and land-atmosphere interactions, soil moisture profoundly affects the ecological environment construction and specific farm planning and management[1,2,3]. There are a number of factors such as the interaction of precipitation, soil depth, vegetation and topography, which will lead to high variation of soil moisture[4,5]. The knowledge of the characteristics of the variability is important for understanding and predicting the hydrological processes to reduce the erosion and raising the utilization ratio of water[6]. In the hilly and gully region of the Loess Plateau, topography, vegetation cover and precipitation play key roles on the spatial distribution of soil moisture in this area
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