| 根系分泌的有机酸及其对喀斯特植物、土壤碳汇的影响 |
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| 引用本文： | 赵宽,吴沿友.根系分泌的有机酸及其对喀斯特植物、土壤碳汇的影响[J].中国岩溶,2011,30(4):466-471. |
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| 作者姓名： | 赵宽 吴沿友 |
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| 作者单位： | 1.现代农业装备与技术教育部重点实验室/江苏大学农业工程研究院 |
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| 基金项目： | 国家自然科学基金项目(40973060)、中国科学院战略性先导科技专项重大课题(XDA05070400)、贵州省社会发展科技攻关计划项目(SY[2010]3043) |
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| 摘 要： | 根系分泌的有机酸是土壤有机酸的重要动态来源,来源于光合作用固定的碳,是土壤碳流动的最活跃形式。根系分泌的有机酸是一种具有调节作用的植物和土壤碳汇。一方面,在喀斯特土壤环境中,植物根系分泌有机酸的含量增加,影响碳汇的产生和流动,直接调节植物与土壤的固碳增汇能力;另一方面,根系分泌的有机酸通过影响土壤中一系列的动态化学和生物学过程,对土壤养分有效性和养分循环以及微生物的活性产生深刻影响,直接影响土壤的固碳增汇能力,从而间接影响植物的固碳增汇能力。因此,根系分泌的有机酸在喀斯特生态系统的固碳增汇中起着重要作用。
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| 关 键 词： | 喀斯特 土壤 植物 微生物 微量元素 根系分泌有机酸 碳汇 |
| 收稿时间： | 2011/10/24 0:00:00 |
Influence of root-secreted organic acid on plant and soil carbon sequestration in karst ecosystem |
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| ZHAO Kuan and WU Yan-you.Influence of root-secreted organic acid on plant and soil carbon sequestration in karst ecosystem[J].Carsologica Sinica,2011,30(4):466-471. |
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| Authors: | ZHAO Kuan and WU Yan-you |
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| Institution: | 1.Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Institute of Agricultural Engineering, Jiangsu University2.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences |
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| Abstract: | Root-secreted organic acid is an important dynamic source of soil organic acid, the carbon from photosynthetic fixation is the most active form in the soil carbon flow. Root-secreted organic acid is a kind of plant and soil carbon sequestration with regulating action. On one hand, plant roots increases the content of root-secreted organic acid which affected the production and flux of carbon sequestration under karst soil environment, directly regulating carbon sequestration of plant and soil. On the other hand, root-secreted organic acid has a profound impact on soil nutrient availability and nutrient cycle, and microbial activity by affecting a series of dynamic chemical and biological processes in the soil, which directly impacts on soil carbon sequestration, thereby, indirectly affecting carbon sequestration of the plants. Therefore, root-secreted organic acid plays an important role on carbon sequestration in karst ecosystem. |
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| Keywords: | karst soil plant microorganism trace element root-secreted organic acid carbon sequestration |
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