贵州喀斯特地区黄壤有机质及其中胡敏酸的碳同位素组成特征
Stable Carbon Isotope Characteristics of Soil Organic Matter and Humic Acid of Yellow Soil in Karst Region of Guizhou Province
查看参考文献47篇
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文摘
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为研究喀斯特地区土壤有机质的来源与演化,对贵州喀斯特地区黄壤剖面中黄土的有机质开展了碳同位素研究。结果表明,随着剖面深度加深,黄壤有机质及其中胡敏酸的δ~(13)C值趋于偏正,且有机质全样的δ~(13)C值高于胡敏酸。另外,胡敏酸超滤组分的δ~(13)C值随着分子量的减少而增大,说明分子量较低的胡敏酸中可能含更多富集~(13)C的组分,而分子量较大的胡敏酸中可能含更多贫~(13)C的组分。黄壤有机质的δ~(13)C值组成差异,反映了黄壤剖面有机质及胡敏酸形成过程中有碳同位素的分馏。 |
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其他语种文摘
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In order to study the source and evolution history of soil organic matter(SOM) in Karst region of southwestern China,we studied the stable carbon isotope of SOM in yellow soil profiles of Guizhou Karst region. The results indicate that the δ~(13)C value of SOM and Humic Acid(HA) tend to be more positive with the increasing of soil profile depth,and the δ~(13)C value of SOM is higher than that of HA fractions. Meanwhile,the δ~(13)C values of HA ultrafiltration component increase with the decreasing of molecular weight,suggesting that HA with lower molecular weight may contain more ~(13)C-riched components and HA with more molecular weight may be depleted in ~(13)C. The differences of δ~(13)C value between different SOMs of yellow soils reflect the fractionation of carbon isotope during the formation of SOM and HA in yellow soil profiles. |
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来源
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矿物岩石地球化学通报
,2017,36(1):166-170 【核心库】
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DOI
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10.3969/j.issn.1007-2802.2017.01.019
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关键词
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黄壤
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胡敏酸
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超滤
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碳同位素
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土壤有机物
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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, 550081
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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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1007-2802 |
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学科
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地质学 |
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文献收藏号
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CSCD:5936093
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