| Layered characteristics and driving mechanisms of temporal soil moisture variation in a small watershed of the southern Loess Plateau |
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| DOI：10.7606/j.issn.1000-7601.2013.05.005 |
| Key Words: soil moisture Wangdonggou watershed temporal variation driving mechanism Loess Plateau |
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| Abstract: |
| Wangdonggou watershed located in the southern Loess Plateau was selected as the study area in this paper. Layered characteristics and driving mechanisms of seasonal and interannual soil moisture variations in the small watershed were comprehensively studied through a long term observation of soil moisture in 600 cm soil profiles of typical plots. Soil water content in the 0～50 cm layer changed intensively with season. Soil water content in the 0～150 cm soil layer decreased to the lowest before rainy season. In contrast to drought season, the depth of soil water recharged in December was as much as 460 cm for wheat land, while the maximum depths recharged were about 260 cm for Robinia pseudoacacia forestland, apple orchard and alfalfa field. Temporal variations of soil moisture in the profiles were characterized by a layered distribution and were closely related w
ith landuse type. As for the same measuring point, soil water contents in the 300～600 cm layer of Robinia pseudoacacia forestland and apple orchard in 2011 were lower than those in 2003, while soil water contents in the same layer of wheat land and natural grassland in 2011 were higher than those in 2003. Both landuse type and topography are the main driving factors for soil moisture change and however, landuse type has more significant effect on soil moisture in deep layer. |
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