| 黄绵土土壤活性有机碳的侵蚀和沉积效应 |
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| 引用本文： | 贾松伟,贺秀斌,韦方强.黄绵土土壤活性有机碳的侵蚀和沉积效应[J].水土保持通报,2007,27(2):10-13. |
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| 作者姓名： | 贾松伟 贺秀斌 韦方强 |
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| 作者单位： | 1. 中国科学院,山地灾害与地表过程重点实验室,四川,成都,610041;中国科学院,水利部,成都山地灾害与环境研究所,四川,成都,610041;中国科学院,研究生院,北京,100039
2. 中国科学院,山地灾害与地表过程重点实验室,四川,成都,610041 |
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| 基金项目： | 国家自然科学基金;国家重点基础研究发展计划(973计划) |
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| 摘 要： | 活性有机碳作为土壤有机碳中活性最强的部分,它比土壤有机碳更敏感于环境的变化。通过野外径流小区观测和室内分析,研究了侵蚀对土壤活性有机碳的影响。结果表明,土壤和泥沙中活性有机碳含量分别在0.15～0.34g/kg和0.28～2.92g/kg之间;坡度≤20°时,活性有机碳的流失量随着坡度的增加而增加;其富集比介于3.25～8.47,且随着侵蚀强度和坡度的增大均减小。泥沙中活性有机碳含量随着侵蚀强度的增加呈对数递减趋势,而活性有机碳流失程度则相反。
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| 关 键 词： | 土壤侵蚀 活性有机碳 沉积效应 碳循环 |
| 文章编号： | 1000-288X(2007)02-0010-04 |
| 收稿时间： | 2006/9/14 0:00:00 |
| 修稿时间： | 09 14 2006 12:00AM |
Erosion and Deposition Effects of Soil Labile Organic Carbon in Loessal Soil |
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| Jia Songwei,He Xiubin and Wei Fangqiang.Erosion and Deposition Effects of Soil Labile Organic Carbon in Loessal Soil[J].Bulletin of Soil and Water Conservation,2007,27(2):10-13. |
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| Authors: | Jia Songwei He Xiubin and Wei Fangqiang |
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| Institution: | 1. Key Laboratory of Mountain Hazards and Surface Process, Chinese Academy of Sciences, Chengdu , Sichan 610041, China ; 2. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and Ministry of Water Resources, Chengdu , Sichuan 610041, China; 3. Graduate School of the Chinese Academy of Sciences, Beijing 100039, China |
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| Abstract: | Labile organic carbon( LOC) is the most active part of soil organic carbon,and it is more sensitive to environment change. This paper studied the effect of soil erosion on LOC with field run off??plot observation and laboratory analysis.Results show that the LOC content in soil ranged between 0.15 g/ kg and 0.34 g/ kg, and was between 0.28 g/ kg and 2.92 g/ kg in sediment.For a slope gradient less than 20,the amount of LOC loss in creased with increased slope gradient.The enrichment ratio of LOC ranged between 3.25 and 8.47,and was negatively related to erosion rate and slope gradient.The LOC content in sediment decreased prog ressively as a log arithm function with increased soil erosion rate,and the LOC loss degree linearly increased with increased soil erosion rate. |
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| Keywords: | soil erosion labile organic carbon(LOC) deposition effects carbon cycle |
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