Abstract: 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.

Key words: Alpine tundra, Biomass, Changbai Mountains