森林细根分解研究进展

Research progress in fine root decomposition in forest ecosystem

细根分解是森林生态系统养分和能量循环的重要环节,是一个贯穿着淋溶粉碎等物理作用以及土壤生物参与的生物化学作用交织在一起的复杂过程,对深入揭示陆地生态系统地表C平衡,认识细根分解的影响因素和机理具有重要意义。但由于细根埋藏于地下,难以在不破坏原有的土壤环境的情况下进行取样,同时分解过程对气候变化的响应受到土壤层的缓冲,致使各种因素对细根分解相对重要性的不同,是细根分解格局和地上部分凋落物分解格局差异的主要原因。本文综述了细根分解的影响因素及研究方法,提出了细根分解未来研究方向,以期加强细根分解的系统研究。

Fine root decomposition is one of the major steps of nutrient and energy cycling in forest ecosystem, and also, a complex process including physical （leaching and fragmentation） and soil biochemical processes. In order to understand the carbon balance in forest ecosystem, it is important and necessary to uncover the factors and mechanisms that regulate fine root decomposition. However, the estimated root decomposition rate is challenging, because roots are hidden from view, and occur in an environment that buffers the impact from climatic change. It is difficult to examine the root decomposition without significantly disturbing forest system. This paper reviewed the factors affecting fine root decomposition and related research methods, and brought forward the future research directions, aimed to promote the study of fine root decomposition in forest ecosystem.