| The Variation of Soil Organic Matter in a Forest-Cultivation Sequence Traced by Stable Carbon Isotopes |
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| 作者姓名： | 刘启明 王世杰 朴河春 欧阳自远 |
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| 作者单位： | [1]StateKeyLaboratoryofEnvironmentalGeochemistry,InstituteofGeochemistry,ChineseAcademyofSciences,Guiyang550002,China [2]StateKeyLaboratoryofEnvironmentalGeochemistry,InstituteofGeochemis |
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| 基金项目： | ThisresearchprojectwasjointlysupportedbytheFoundationofChineseAcademyofSciencesforInnovation (GrantNo .KZCX2 10 5 )andtheNationalNaturalScienceFoundationofChina (GrantNos .90 2 0 2 0 0 3and 49772 175 ) . |
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| 摘 要： | On the basis of different photosynthetic pathways.there is an obvious difference in δ^13C values between C3 and C4 plants,In terms of this characteristic,we analyzed the organic carbon content (forestlands:1.81%-16.00%;farmland:0.45%-2.22%) and δ^13C values(forestlands:-23.86‰--27.12‰;farmland:-19.66‰--23.26‰)of three profile-soil samples either in farmland or in forestland near the Maolan Karst virgin forest,where there were developed plant C3 plants previously and now are C4 plants.Results showed that the deforestation has accelerated the decomposition rate of soil organic matter and reduced the proportion of active components in soil organic matter and thus soil fertility.
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| 关 键 词： | 生态系统 土壤有机物 SOM 碳同位素 示踪 农作物 |
The variation of soil organic matter in a forest-cultivation sequence traced by stable carbon isotopes |
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| Liu Qiming,Wang Shijie,Piao Hechun,Ouyang Ziyuan.The Variation of Soil Organic Matter in a Forest-Cultivation Sequence Traced by Stable Carbon Isotopes[J].Chinese Journal of Geochemistry,2003,22(1):83-88. |
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| Authors: | Liu Qiming Wang Shijie Piao Hechun Ouyang Ziyuan |
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| Institution: | (1) State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 550002 Guiyang, China;(2) Graduate School, Chinese Academy of Sciences, 100039 Beijing, China |
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| Abstract: | On the basis of different photosynthetic pathways, there is an obvious difference in δ13C values between C3 and C4 plants. In terms of this characteristic, we analyzed the organic carbon content (forestlands: 1.81% –16.00%; farmland: 0.43%
–2.22%) and δ13C values (forestlands: -23. 86‰ -−27. 12‰; farmland: −19. 66‰ -−23.26‰) of three profile-soil samples either in farmland or
in forestland near the Maolan Karst virgin forest, where there were developed plant C3 plants previously and now are C4 plants. Results showed that the deforestation has accelerated the decomposition rate of soil organic matter and reduced the
proportion of active components in soil organic matter and thus soil fertility.
This research project was jointly supported by the Foundation of Chinese Academy of Sciences for Innovation (Grant No. KZCX2-105)
and the National Natural Science Foundation of China (Grant Nos. 90202003 and 49772175). |
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| Keywords: | ecosystem soil organic matter (SOM) δ 13C value |
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