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| Dynamics of moisture of soil profile in Loess area of western Shanxi |
| Li Xiaoyin, Bi Huaxing, Li Jun, Liu Xin, Guo Mengxia |
| Beijing Forestry University, Key Lab of Soil and Water Conservation and Desertification Combating, Ministry of Education, 100083,Beijing, China |
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Abstract By monitoring the soil moisture in different layers (20cm) of soil profile (0-200cm) with different vegetation cover types in loess area during 2004 (from July to October) and 2005 (from April to October), the paper focus on analyzing the distribution characteristics, the season dynamic state variety, the variation characteristic of soil moisture of soil profile and the influence of the different vegetation cover types upon the soil moisture. The result indicated that: the soil moisture increases with the soil depth decreasing in 2004, while increase is tiny in 2005. The soil moisture variety in the soil profile includes three types: the “<” type(decreasing-increasing with the increasing of the soil depth), the anti-“S” type (increasing-decreasing-increasing with the increasing of the soil depth), and the wave type (increasing-decreasing-increasing-decreasing with the increasing of the soil depth). During observation period, the soil moisture of each layer presents to reduce trend with various time, and it is closely related with rainfall. The variation coefficient of soil moisture is the biggest in the surface layer (0-20cm) in the profile, while the layer between 0-100cm presents to decreasing trend, in the 100-200cm soil layer keeping constant basically, so 100-120cm can be defined as a limited boundary between the quickly changing layer and the stable layer of soil moisture.
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Received: 17 January 2006
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