论文部分内容阅读
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。
Organic acids secreted by roots are important dynamic sources of soil organic acids, which are derived from photosynthesis of fixed carbon and are the most active forms of soil carbon flow. Organic acids secreted by the root system are a type of plant and soil carbon sink with regulatory roles. On the one hand, in the karst soil environment, the content of organic acids excreted by plant roots is increased, which affects the generation and flow of carbon sinks and directly regulates the ability of plants and soil to sequester carbon. On the other hand, A series of dynamic chemical and biological processes have a profound impact on soil nutrient availability and nutrient cycling as well as microbial activity, which directly affects soil carbon sequestration and exchange ability, which indirectly affects plant carbon sequestration and sink capacity. Therefore, the organic acids secreted by the roots play an important role in the carbon sequestration in the karst ecosystem.