根系分泌的有机酸及其对喀斯特植物、土壤碳汇的影响

Influence of root-secreted organic acid on plant and soil carbon sequestration in karst ecosystem

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。

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.