| 稳定碳同位素示踪农林生态转换系统中土壤有机质的含量变化 |
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| 引用本文： | 刘启明,王世杰,朴河春,欧阳自远.稳定碳同位素示踪农林生态转换系统中土壤有机质的含量变化[J].环境科学,2002,23(3):75-78. |
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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. 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;中国科学院研究生院,北京,100039
2. 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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| 基金项目： | 国家自然科学基金项目(49833002,49772175);中科院知识创新工程项目(KZCX2-105);环境地球化学国家重点实验室创新领域项目 |
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| 摘 要： | 为了观察生态系统的转变对土壤有机质的影响,在贵州茂兰喀斯特原始森林保护区内农林生态系统发生转变的地域,分析了土壤有机质含量和土壤有机质的δ13C值森林点土壤有机碳含量普遍较高(1.81%～16.00%),而农田点土壤有机碳含量在0.43%～2.22%之间,表明毁林造田加速了土壤有机质的降解,使土壤有机质总量减少;利用C3植物与C4植物δ13C值的显著差异,对比森林点与农田点的δ13C值(森林点:-23.86‰～-27.12‰;农田点:-19.66‰～-23.26‰),计算表明,毁林造田同时也降低了土壤有机质中活性大的组分的比例,使土壤肥力下降.
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| 关 键 词： | 生态系统 土壤有机质 δ13C值 |
| 文章编号： | 0250-3301(2002)03-04-0075 |
| 收稿时间： | 2001/3/16 0:00:00 |
| 修稿时间： | 2001年3月16日 |
Soil Organic Matter Changes of Turnover Ecosystems Traced by Stable Carbon Isotopes |
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| Liu Qiming,Wang Shijie,Piao Hechun and Ouyang Ziyuan.Soil Organic Matter Changes of Turnover Ecosystems Traced by Stable Carbon Isotopes[J].Chinese Journal of Environmental Science,2002,23(3):75-78. |
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| Authors: | Liu Qiming Wang Shijie Piao Hechun and Ouyang Ziyuan |
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| Institution: | State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China. |
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| Abstract: | On the basis of different photosynthetic pathway, there's obvious difference in delta 13C values between C3 plants and C4 plants. Use this characteristic, the organic carbon content (forest lands: 1.81%-16.00%; farms: 0.43%-2.22%) and delta 13C values (forest lands: -23.86@1000(-)-27.12@1000; farms: -19.66@1000(-)-23.26@1000) of three profile soil samples either in farms and forest lands near Maolan Karst virgin forest was analyzed, there plant C3 plants previously and plant C4 plants now. Results show that clearing forest have accelerated the decompose rate of soil organic matter and decreased the proportion of active-component in soil organic matter, reducing of soil fertility. |
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