草地生态系统温室气体排放机理及影响因素

Mechanisms and controlling factors of grassland ecosystem greenhouse gas emissions

草地生态系统是陆地生态系统的主体,已成为人类活动影响较为严重的陆地生态系统之一,其温室气体排放对全球气候变化具重要影响。本研究综述了草地生态系统中主要温室气体CO2、CH4和N2O的排放机理和主要影响因素的研究进展,指出草地生态系统温室气体排放的不确定性是环境、生物和管理因素共同作用的结果。应加强草地生态系统温室气体产生机理、整体过程和不同区域草地生态系统温室气体排放的比较研究,并依照IPCC推荐的方法,编制和完善我国不同草地类型和利用方式下温室气体排放清单。

Grassland ecosystems are the main terrestrial ecosystems, and are intensively affected by human activities. Greenhouse gas emissions from grassland ecosystems have severely impacted on the global climate changes. This study gave a brief review of the mechanisms and controlling factors of CO2, CH4 and N20 emissions from grassland ecosystems and indivated that the conjunction of environmental, biological and management factors played a key role in variations of greenhouse gas emissions from grassland ecosystems. The key issues and further tasks were discussed, which included mechanisms and the overall process of greenhouse gas emissions, and the comparative study of greenhouse gas emissions of grassland ecosystems in different regions. Developing and improving greenhouse gas emission inventories under different grassland types and utilization patterns, according to the methods recommended by IPCC, will also be the further study objectives.