土壤微生物残体碳积累对侵蚀区植被恢复的响应机制研究进展

Advances of the Response Mechanism of Soil Microbial Residual Carbon to Vegetation Restoration Process in Eroded Area

  • 摘要: 土壤侵蚀是导致土壤有机碳(SOC)流失的主要驱动力之一,微生物残体是土壤稳定有机碳库的重要来源,植被恢复对退化生境碳的固持有着重要作用。而侵蚀地的植被恢复对土壤微生物残体碳(MRC)影响的研究面临着关注不够和支持不足的问题,加强这一领域的研究对于改善生态环境、维持碳平衡和应对全球气候变化具有重要作用。本文在简要介绍MRC内涵、形成过程、测定与表征指标及其对土壤稳定态有机碳积累重要作用的基础上,综述了典型侵蚀区植被恢复模式和不同植被恢复阶段对MRC的影响效应(包括影响方向和影响程度),并着重从全球、区域和样地三种尺度上梳理了MRC对植被恢复进程响应机制的研究进展。最后,从加强MRC积累效益与能量驱动机制、研究手段的优化、不同母质条件以及不同土壤层次的对比四个方面指出了该领域需要关注的问题点。

     

    Abstract: Soil erosion is one of the main driving forces leading to soil organic carbon (SOC) loss. Microbial residues are an important source of soil stable organic carbon pool. Vegetation restoration plays an important role in carbon sequestration in degraded habitats. However, the research on the impact of vegetation restoration on soil microbial residual carbon (MRC) in eroded land has received insufficient attention. Strengthening the research in this field was of great importance for improving ecological environment, maintaining carbon balance and coping with global climate change. Based on a brief introduction of the connotation, formation process, measurement and characterization indices of MRC and its important role in soil stable organic carbon accumulation, this paper reviewed the influence of vegetation restoration models and different vegetation restoration stages on MRC in typical erosion areas (including the direction and degree of influence). The research progress of the response mechanism of MRC to vegetation restoration process at global, regional and plot scales was reviewed as well. Finally, the problems from 4 aspects needed to be paid attention were pointed out: the accumulation benefit and energy driving mechanism of MRC, optimization of research methods, different parent material conditions and comparison of different soil levels.

     

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