植物来源碳和土壤属性对土壤有机碳激发效应影响的研究进展

Research Progress on the Effects of Plant-Derived Carbon and Soil Properties on the Priming Effect of Soil Organic Carbon

  • 摘要: 土壤有机碳的激发效应(priming effects, PEs)是指外源碳输入诱导土壤内固有有机质矿化加速的现象,这一过程对于全球碳循环和长期土壤肥力维持具有重要意义。当前,关于植物和土壤属性如何影响土壤激发效应的研究正受到广泛关注。本综述通过梳理近年来的相关研究,探讨了植物来源碳属性(如:根系分泌物、凋落物等)和土壤属性(如:土壤质地、pH值、微生物群落结构等)对土壤激发效应的影响和调控机制。研究表明,植物来源碳和土壤属性显著影响外源碳的利用效率和微生物代谢途径,进而影响土壤有机碳激发效应和矿化动态。同时,本文还指出,虽然植物-土壤互作对土壤激发效应的影响研究逐步成为研究热点,但具体作用机制还需要进一步加强研究。文章最后提出未来需要深入的研究方向,包括土壤-植物相互作用的长期效应、外源有机碳输入对土壤碳稳定性的影响,以及在不同气候带土壤激发效应的差异性和机制研究。本综述为理解土壤有机碳激发效应提供了新的视角,旨在为更有效地推动实现碳达峰和碳中和目标。

     

    Abstract: The priming effect of soil organic carbon refers to the phenomenon where the input of exogenous carbon induces an acceleration in the mineralization of inherent soil organic matter. This process is significant for the global carbon cycle and the maintenance of long-term soil fertility. Currently, the researches on how plant and soil properties influence soil priming effects has been paid great attention. This review summarized recent studies to explore the impacts and regulatory mechanisms of plant-derived carbon properties (such as root exudates and litter) and soil properties (such as soil texture, pH, and microbial community structure) on soil priming effects. The results indicated that plant-derived carbon and soil properties significantly affected the utilization efficiency of exogenous carbon and microbial metabolic pathways, thereby influencing the priming effect and mineralization dynamics of soil organic carbon. Additionally, this review highlighted that while the study of plant-soil interactions in relation to soil priming effects was gradually becoming a research hotspot, the specific mechanisms of these interactions required further investigation. Finally, the article proposed future research directions, including the long-term effects of soil-plant interactions, the impact of exogenous organic carbon input on soil carbon stability, and the differences and mechanisms of soil priming effects across different climatic zones. This review provided a new insight for understanding the priming effect of soil organic carbon and aimed to contribute to the effective advancement of carbon peaking and carbon neutrality targets.

     

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