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SCI论文目录 |
Spatial variability of surface soil moisture content in a re-vegetation desert area in Shapotou, Northern China |
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| 出 版 社：Journal of Arid Environments |
| 发表时间：2008, 72: 1675-1683 |
| 台 站：
沙坡头沙漠试验研究站
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| 作 者：潘颜霞 |
| 点 击 率：3567 |
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| 关 键 字：Coefficient of variation |
| 摘 要：Surface soil moisture content exhibits a high degree of spatial and temporal variability.
The purpose of this study was (a) to characterize the spatial and temporal variations in
soil moisture contents in the depths of 0–15 and 0–30 cm soil layer in an artificially revegetated
desert area in Shapotou, China; and (b) to make inferences regarding the
environmental factors that influence such variability. Over a period of 7-month
experiment, soil moisture contents were measured with Time Domain Reflectometry
(TDR) at an interval of every half a month at a grid space with 10m intervals horizontally
covering 4500m2 area, which include a topography from dune crest to dune hollow, and
again to dune crest. Results indicated that the distribution of soil moisture at the grid
scale was in a pattern of normal distribution with a significant temporal–spatial
variability; the variability of soil moisture decreased with decreased mean soil moisture
content, and it was higher in the depth of 0–15 cm than that in the depth of 0–30 cm.
Relative elevation was a main influence factor of soil moisture variability especially after
rainfall events and its influence was more tremendous in the depth of 0–30cm than that
in the depth of 0–15 cm. There was a consistent time-series pattern between the
vegetation cover and the soil moisture content and the relative elevation, which increased
under the rainstorm events. Soil texture (particle size distribution) had an opposite timeseries
pattern with relative elevation and vegetation cover, and the correlation was higher
in the depth of 0–15 cm than that in the depth of 0–30 cm. We may conclude that local
topography and vegetation cover were the main influencing factors of soil moisture
variations immediately after the rainstorm events, whereas the soil texture was an
important influencing factor as the soil dried up in the study area. |
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