| Cite this article: | 马耘秀,夏露,范毅.不同土地利用和地形条件对黄土丘陵区土壤水分的影响[J].灌溉排水学报,0,():-. |
| MaYunxiu,XiaLu,FanYi.不同土地利用和地形条件对黄土丘陵区土壤水分的影响[J].灌溉排水学报,0,():-. |
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| DOI： |
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| Effects of Different Land Use and Topographic Conditions on Soil Moisture in Loess Area |
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MaYunxiu,XiaLu,FanYi
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1.Shanxi Agricultural University;2.Shanxi Fenhe Valley Management Co. , Ltd.
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| Abstract: |
| 【Background and objective】 Soil moisture is an effective water source for plant growth in the semi-arid Loess Plateau of China. Characterizing the response of soil moisture to its dominant controling factors, such as land use and topography, is important for the sustainability of vegetation restoration in this region.【Method】The soil moisture content of 0-200 cm soil layer under different underlying surface conditions, located in the Loess area of Ningwu County, Shanxi Province, was measured by soil drilling method from July to September in 2020. The spatial and temporal variability of soil moisture was then analyzed and the effects of land use (artificial forest land, natural grassland and cultivated land) , slope position (uphill position, downhill position and gully bed) and slope direction (shady slope and sunny slope) on the change of soil water were also discussed. 【Result】(1) The temporal variation of soil moisture and precipitation was roughly consistent. With the increase of soil depth, the soil moisture contents decreased first and then stabilized or increased on the up-slope and down-slope plots, which obeyed the order of rapidly variable layer—active layer—subactive layer—relatively stable layer, However, the vertical variation regularity of the sample plots located in the gully bed was changeable. (2) The soil moisture contents of different land use types were variable. The soil moisture order of the sample plot located at the uphill position was: natural grassland > cultivated land > artificial forest in the up-slope position,
which was caused by the different water consumption of different vegetation types. However, the order of soil moisture content of the sample plot located at the gully bed position was: forest land > cultivated land > natural grassland. The possible reason was that the elevation of the artificial forest land was the lowest and the distance from the river was the nearest, so its soil water could be fed up by both the river runoff and the groundwater. It can be seen that the influence of land use on soil moisture was concealed by the influence of topography in the position of gully bed. (3) The soil moisture content increased from the uphill position to the downhill position to the gully bed, and the soil moisture condition of the shady slope was usually better than that of the sunny slope. 【Conclusion】In the future ecological restoration process of the study area, it is suitable to plant artificial forests with large water consumption at the downhill position, gully bed and shady slope, where the soil moisture condition is better, while the ecological restoration model of natural restoration is suitable for the uphill position and the sunny slope. |
| Key words: soil moisture; land use; slope position; slope direction; loess area. |
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