喀斯特地区土壤有机质的稳定碳同位素地球化学特征
GEOCHEMICAL CHARACTERISTICS OF STABLE CARBON ISOTOPES IN SOIL ORGANIC MATTER FROM KARST AREAS
查看参考文献24篇
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文摘
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以喀斯特地区二种主要的土壤类型石灰土和黄壤为例，对三种植被类型下土壤及土壤不同粒径组分中有机质的稳定碳同位素组成（δ^13C值）进行了分析，结果显示：石灰土剖面中土壤有机碳含量均大于1．0％，最大值为表层土的7．1％，而三个黄壤剖面中土壤有机碳含量在0．3％～4．6％之间；石灰土剖面中土壤有机质δ^13C值的变化范围仅为．24．1‰～23．0‰，土壤不同粒径组分中有机质的δ^13C值变幅也较小；而黄壤剖面中土壤有机质δ^13C值的变化范围较大，在．24．5‰-21．1‰之间，土壤不同粒径组分中有机质的δ^13C值变幅也较大。对比研究表明，不同土壤类型中有机质的深度分布特征具有显著差异，土壤有机质的稳定碳同位素地球化学具有明显的区域性特征 |
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其他语种文摘
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Taking limestone soil and yellow soil, the two major soil types in karst areas, for examples, we analyzed the δ^13C values of soil organic matter in bulk soils and particle-size separates of four soil profiles under three vegetable forms. The results revealed that in the limestone soil profile, soil organic carbon contents are all above 1.0%, and the highest value is 7.1% in the surface soil, however, they are between 0.3% - 4.6% in the three yellow soil profiles. From the surface to the bottom of the soil profiles, the δ^13C values of soil organic carbon for the limestone soil profile vary only between -24.1‰ - -23.0‰, -24.5‰ - -21.1‰ for the yellow soil profiles The variation range of δ^13C values of soil organic carbon associated with particle-size separates is small for limestone soil but is considerably large for yellow soil. The contrast research indicated that there is a significant difference in variation between the contents and the δ^13C values of soil organic matter with depth in these two soil types. The stable carbon isotope geochemistry of soil organic matter shows distinct regional characteristics in karst areas. |
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来源
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地球与环境
,2006,34(3):51-58 【核心库】
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关键词
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喀斯特地区
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土壤有机质
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稳定碳同位素
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粒径组分
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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, 贵州, 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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1672-9250 |
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学科
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地质学 |
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基金
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中国科学院知识创新工程重要方向项目
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中国科学院知识创新工程项目
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文献收藏号
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CSCD:2545160
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