退耕弃荒洼地土壤有机碳在生态系统转化过程中的动态变化
Soil Organic Carbon Variation of Defarming and Wasteland During Alteration of Ecosystem in Billabong
查看参考文献20篇
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文摘
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在贵州喀斯特区域一块典型的退耕弃荒洼地中央和周边坡面采集了4个土壤剖面,研究土壤有机碳（SOC）含量和δ~13C_(org)值的变化.结果表明,坡面不同土壤层次SOC的变化范围为6.0-92.3 mg·kg~(-1),并沿着土壤层次的加深迅速降低,变化幅度远远大于洼地土壤剖面（6.3-26.7 mg·kg~(-1)）.坡面土壤δ~13C_(org)介于-25.103‰和-23.666‰之间,但各剖面土层内部δ~13C_(org)变化趋势不一致.洼地土壤δ~13C_(org)介于-23.495‰和-20.809‰之间,并随着土壤层次的加深δ~(13)C_(org)逐渐增加.洼地土壤剖面层次内C_4-C占SOC的比例随土壤层次的加深逐渐增加,与林-农生态系统转变过程中的变化趋势相反;土壤δ~13C_(org)与C_3-C之间呈显著相关性（R~2=0.7806,n=7）,对δ~(13)C_(org)起到主要影响作用的是退耕弃荒后新加入的C_3-C. |
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其他语种文摘
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Four soil profile samples were collected in the middle of de-farming and wasteland billabong and around slopes,located at typical karst district of Guizhou province. Soil organic matter(SOC) content and(δ~(13)C_(org)) were determined. SOC content ranged from 6.0(mg·kg~(-1)) to 92.3(mg·kg~(-1)),and decreased with depth at slope soil profiles. The range of value was bigger than that at billabong soil profile(6.3～26.7(mg·kg~(-1))).The value of(δ~(13)C_(org)) at slope profiles was between-25.103‰ and-23.666‰,but variation direction of three slope soil profiles was different. The value of(δ~(13)C_(org)) in billabong soil profile was between-23.495‰ and-20.809‰,and increased with depth.The percentage of C_4-C increased with depth in billabong soil profile. The correlation between(δ~(13)C_(soc)) and C_4-C,C_3-C was significant(R=0.884,n=7),influenced by new C_3-C. |
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来源
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环境科学
,2007,28(9):1912-1917 【核心库】
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关键词
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退耕弃荒
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洼地
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有机碳
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来源
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δ~(13)C
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地址
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中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵阳, 550002
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0250-3301 |
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学科
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环境科学基础理论 |
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基金
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国家973计划
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文献收藏号
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CSCD:2953272
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