| Saturation of available soil water for micro-topography in loess area of north Shaanxi |
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| DOI：10.7606/j.issn.1000-7601.2017.04.14 |
| Key Words: loess area of north Shaanxi sunny steep slope micro-topography saturation of available soil water |
| Author Name | Affiliation | | LI Zeng-yao | School of Soil and Water Conservation, Beijing Forestry University, Beijing, 100083, China | | ZHAO Xing-kai | School of Soil and Water Conservation, Beijing Forestry University, Beijing, 100083, China | | ZHU Qing-ke | School of Soil and Water Conservation, Beijing Forestry University, Beijing, 100083, China |
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| Abstract: |
| The paper investigated the saturation of available soil water at soil depths of 0～60 cm for sunny, steep slope micro-topography in a loess area of north Shaanxi on the basis of wavelet analysis, regression analysis, and the Mann-Kendall trend test, aiming to clarify the characteristics of saturation of available soil water in different micro-topographies and its relationship with plant community characteristics. The following findings were made: (1) At soil depths of 0～60 cm, in terms of the saturation of available soil water, different landform units can be ranked in the following ascending order: collapse, platform, undisturbed slope, gully, shallow gully, and scarp. The saturation of available soil water of the gully, collapse, and scarp increased significantly; the saturation of the available soil water of the shallow gully, platform, and undisturbed slope showed a downward trend, but the trend was not significant. (2) During the study period, the main cycles of different micro-topographies were different. Scarp, collapse, and platform had the same main cycle. The main cycles of the shallow gully, gully, and undisturbed slope were 23, 21, and 28 months, respectively. (3) In different micro-topographies, the Margalef richness, Simpson diversity, Shannon-Wiener diversity, and Pielou evenness indices were positively correlated with the saturation of available soil water. The highest correlation was found between the Shannon-Wiener diversity index and the saturation of available soil water. |
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