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| Soil water content heterogeneity at small-scale on degradedgrasslands on Loess Plateau |
| LIU Bing-Xia1, 2 , SHAO Meng-An1, 3 |
| (1. State Key Laboratory of Soil Erosion and Dry Land Farming on the Loess Plateau, Institute of Soil and Water Conservation,CAS & MWR,712100, Yangling, Shaanxi; 2. Graduate School of Chinese Academy of Sciences, 100039, Beijing;3. Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, 100101, Beijing:China) |
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Abstract In order to explore the heterogeneity of topsoil water content (SM) of regressed grasslands at small-scale, three regressed grasslands in water-wind erosion crisscross region on Loess Plateau were selected. By using high sampling-density and high frequency sampling methods at three sampling transects, we explored the heterogeneity of topsoil water content when the surface soil was in dry and moist conditions and different sampling spaces at small-scale. Results showed that the heterogeneity of topsoil water content of different regressed grasslands followed a sequence of 12 a >20 a >5 a and it presented medium variation when topsoil was dry. Topsoil water content was positively correlated with its variance value, that is the variance of SM increased with SM increase. Spatial continuity of SM followed a sequence of 12 a regressed grassland >20 a regressed grassland >5 a regressed grassland and it was negatively correlated with topsoil water content. At different sampling spaces at small-scale, the variation intensity of topsoil water content under different regressed grasslands had no change whenever the topsoil was dry or moist. This information may provide scientific proofs for water reasonable utilization and vegetation restoration on the Loess Plateau.
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Received: 09 February 2012
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