气候变化、火干扰与生态系统生产力

 综述了气候变化、火干扰与生态系统生产力之间的相互作用关系以及目前相关的研究进展。侧重介绍了气候变化与火干扰之间的相互作用关系以及火干扰对生态系统生产力的影响。气候变化通过作用于可燃物质数量、湿度和火灾天气来影响火干扰的发生频率和强度，而火干扰过程释放大量温室气体和烟尘物质反过来也会对气候变化产生影响。另外，火干扰过程改变了火烧迹地的土壤生物地球化学性质、养分循环和分配以及大气组成，进而对生态系统对CO2的吸收能力产生影响。正确理解三者之间的逻辑关系，对于我们有效地利用火管理提高区域生态系统碳吸收，减少碳排放，减缓全球变化速率，都具有重要的指导意义 。

INTERACTION AMONG CLIMATIC CHANGE, FIRE DISTURBANCE AND ECOSYSTEM PRODUCTIVITY

There are complex interactions among climatic change, fire disturbance, and ecosystem productivity. Fire disturbance could change the biogeochemical properties of soil and ecosystem structure, nutrient cycle and distribution as well as atmospheric composition and then influence ecosystem productivity; additionally, fire-induced emission can change the atmospheric composition and hence impacts the climate system; climate warming could alter the properties of fuel load and increase the frequency of fire-weather, and then in turn, influences regional fire regime. In order to evaluate the impact of global change on ecosystem productivity comprehensively, it is essential to fully understand this complex interaction. In this paper, we have reviewed the mechanisms of the interactions among global change, fire disturbance, and ecosystem productivity. Four critical issues have been explored: 1) methods used for constructing time sequence of fire information, 2) interaction between fire disturbance and global climate change, 3) interaction between fire disturbance and ecosystem productivity, and 4) changing fire management strategy in response to global change. The comprehensive understanding of the complex interaction will be an important basis for further study how ecosystem pattern and process respond global change.