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
Soil Organic Matter Changes of Turnover Ecosystems Traced by Stable Carbon Isotopes
查看参考文献15篇
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文摘
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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δ~(13)C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C_3植物与C_4植物δ~(13)C值的显著差异，对比森林点与农田点的δ~(13)C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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其他语种文摘
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On the basis of different photosynthetic pathway, there's obvious difference in δ ~(13)C values between C_3 plants and C_4 plants. Use this characteristic, the organic carbon content (forest lands: 1.81%～16.00%; farms: 0.43%～2.22%) and δ ~(13)C values (forest lands: -23.86‰～-27.12‰; farms: -19.66‰～-23.26‰) of three profile soil samples either in farms and forest lands near Maolan Karst virgin forest was analyzed, there plant C_3 plants previously and plant C_4 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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来源
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环境科学
,2002,23(3):75-78 【核心库】
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关键词
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生态系统
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土壤有机质
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δ~(13)C值
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地址
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中科院贵阳地球化学所, 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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国家自然科学基金
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中国科学院知识创新工程项目
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中国科学院广州地球化学研究所知识创新工程领域前沿项目
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文献收藏号
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CSCD:1009035
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