Abstract:

Forest ecosystem is an important carbon pool and plays an important role in mitigating climate warming. As a discontinuous ecological factor of forest,forest fire disturbance is the driving factor of biogeochemical cycle,which significantly changes the structure and function of the ecosystem,nutrient cycle and energy transfer,and causes the change of carbon pool and carbon distribution pattern in forest ecosystem,and in turn affects the process of forest succession and carbon sequestration capacity. This paper reviews the domestic and abroad research method on the impact of forest fire disturbance on forest carbon pool,and focuses on the direct and indirect effects of forest fire disturbance on forest carbon pool. The direct impact is mainly the direct carbon loss of forest ecosystem,while the indirect impact is mainly through forest ecosystem net primary productivity and soil respiration changes to affect the carbon cycle and carbon balance of forest ecosystems. The influence of forest fire disturbance on vegetation carbon pool,litter carbon pool and soil organic carbon pool are respectively clarified. The forest fire disturbance affects vegetation carbon pool and nutrient turnover by directly changing vegetation coverage,and ultimately affects vegetation fixation to carbon and the transfer of carbon from vegetation to soil leads to redistribution between different carbon pools. In terms of the effects of forest fire disturbance on the litter carbon pool of ecosystem,the main researches are mainly the change of litter production under different forest fire intensity and environmental gradient after forest fire disturbance. The influence of forest fire disturbance on soil organic carbon pool can be studied from small scale and large scale. Generally,in the small scale,the change of topographic conditions may be the main reason that affects the vertical distribution of soil organic carbon pool. At relatively large regional scales,the interactions of climate,soil texture,topography,vegetation,and human activities and management levels can affect the spatial migration and morphological transformation of soil organic carbon pools,which leads to the difference of soil organic carbon pools in different regions. On this basis,this paper points out the existing problems in the study. Finally,the quantitative research on the influence of forest fire disturbance on the carbon pool of forest ecosystem is put forward:1) Futher research on the effect mechanism of forest fire disturbance on the carbon pool circulation of forest ecosystem. 2) Strengthen the systematic study of "vegetation-soil-water-microbe-climate". 3) Improve the quantification of forest fires in the forest ecosystem by the forest fire disturbance at different time and space scales. 4) Futher discussion in-depth of the interaction between forest fire disturbance and carbon in forest ecosystems and its impact mechanism.

Key words: forest fire disturbance, forest ecosystem, vegetation carbon pool, litterfall carbon pool, soil organic carbon pool