| Soil Organic Carbon Loss under Different Slope Gradients in Loess Hilly Region |
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| 作者姓名： | JIA Songwei HE Xiubin WEI Fangqiang |
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| 作者单位： | [1]Key Laboratory of Mountain Hazards and Surface Process, Chinese Academy of Sciences/Institute of Mountain Hazards and Environment, Chengdu 610041, Sichuan, China [2]Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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| 基金项目： | Supported by the National Natural Science Foundation of China （90502007） and the National Basic Research Program of China （973 Program 2007CB407206） |
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| 摘 要： | Based on field runoff plots observation and sample analysis, the effect of slope gradient on soil organic carbon loss was studied under natural rainfall conditions in loess hilly region. The results showed that with slope gradient increasing （from10° to 30°）, the changing trend of soil erosion intensity （A） was A20°〉A30°〉A15°〉A10°〉A25°, suggesting that slope gradient between 20° and 25° was a critical degree ranger to exist. Soil organic carbon loss was mainly influenced by soil erosion intensity, appearing the same trend as did soil erosion intensity with increasing slope gradient. Soil erosion results in organic carbon enrichment in sediment. Average enrichment ratios of five runoff plots varied from 2.27 to 3.74, and decreased with increasing erosion intensity and slope gradient. The decrease of surface runoff and soil erosion is the key to reduce soil organic carbon loss.
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| 关 键 词： | 土壤侵蚀 土壤有机碳流失 碳循环 坡度 |
| 文章编号： | 1007-1202（2007）04-0695-04 |
| 收稿时间： | 2 September 2006 |
| 修稿时间： | 2006-09-02 |
Soil organic carbon loss under different slope gradients in loess hilly region |
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| JIA Songwei HE Xiubin WEI Fangqiang.Soil Organic Carbon Loss under Different Slope Gradients in Loess Hilly Region[J].Wuhan University Journal of Natural Sciences,2007,12(4):695-698. |
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| Authors: | Jia Songwei He Xiubin Wei Fangqiang |
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| Institution: | (1) Key Laboratory of Mountain Hazards and Surface Process, Chinese Academy of Sciences, Chengdu, 610041, Sichuan, China;(2) Graduate University of Chinese Academy of Sciences, Beijing, 100049, China;(3) Institute of Mountain Hazards and Environment, Chengdu, 610041, Sichuan, China |
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| Abstract: | Based on field runoff plots observation and sample analysis, the effect of slope gradient on soil organic carbon loss was
studied under natural rainfall conditions in loess hilly region. The results showed that with slope gradient increasing (from
10° to 30°), the changing trend of soil erosion intensity (A) was A
20°>A
30°>A
15°>A
10°>A
25°, suggesting that slope gradient between 20° and 25° was a critical degree ranger to exist. Soil organic carbon loss was mainly
influenced by soil erosion intensity, appearing the same trend as did soil erosion intensity with increasing slope gradient.
Soil erosion results in organic carbon enrichment in sediment. Average enrichment ratios of five runoff plots varied from
2.27 to 3.74, and decreased with increasing erosion intensity and slope gradient. The decrease of surface runoff and soil
erosion is the key to reduce soil organic carbon loss.
Biography: JIA Songwei (1979–), male, Ph. D. candidate, research direction: soil erosion and soil organic carbon loss. |
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| Keywords: | soil erosion soil organic carbon loss slope gradient carbon cycle |
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