| Effects of vegetation restoration on soil aggregates and carbon sequestration in Wuding River catchment |
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| DOI：10.7606/j.issn.1000-7601.2017.01.41 |
| Key Words: vegetation restoration soil organic carbon density water stable aggregates Le Bissonnais method Wuding river catchment |
| Author Name | Affiliation | | DONG Li-li | College of Resources & Environment and History & Culture, Xianyang Normal University, Xianyang, Shaanxi 712000, China | | LI Xiao-hua | College of Resources & Environment and History & Culture, Xianyang Normal University, Xianyang, Shaanxi 712000, China | | YANG Bo | College of Resources & Environment and History & Culture, Xianyang Normal University, Xianyang, Shaanxi 712000, China |
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| Abstract: |
| Content of soil water stable aggregates with different diameter, soil organic matter, and available phosphorus in whole soil samples and in aggregations of different diameter were measured in order to evaluate the effect of vegetation restoration on soil structure, nutrients and soil carbon sequestration. Soil samples were collected from slope cropland and vegetation restoration areas experiencing cropland abandonment 4, 5, 10, 30, 50 years in Wuding river catchment. The results showed that the content of soil organic matter and available phosphorus, was 6.73～31.83 g·kg-1 and 1.93～14.72 mg·kg-1 in whole soil samples, and 7.15～26.03 g·kg-1 and 3.71～16.64 mg·kg-1 in aggregations with different diameters. Top-soil organic matter and soil organic carbon density were increased significantly by vegetation restoration compared with cropping land, whose increases were most obvious at Pyrus betulaefolia community and increased by 24.93 g·kg-1 and 91.98 mg·cm-2. Soil water stable aggregates were mainly <0.05 mm and 0.05～0.1 mm, with the ratios being 37.06%～57.22% and 21.71%～29.76% respectively. The aggregate-associated organic matter content was the highest in 0.2～0.5 mm, which increased with decrease of diameter from >2 mm to 0.2～0.5 mm but decreased with decrease of diameter from 0.2～0.5 mm to <0.05 mm. The aggregate-associated available phosphorus content decreased with decrease of diameter from >2 mm to <0.05 mm except 1～2 mm whose value was the highest. Linear positive correlation was observed between soil organic density and vegetation restoration years. It takes more years for the ability of soil water erosion resistance to be improved significantly compared to the improvement of soil carbon sequestration. The aggregate-associated organic matter content was the higher under fast wetting than slow wetting. Heavy rain or rainstorm may be the primary cause destroying soil structure and decomposing soil organic carbon at the area. |
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