国外湿地生态系统碳循环研究进展

在全球变化背景下,面对湿地生态系统是否能维持其碳汇功能等问题,在以下几方面进行了讨论:当前湿地生态系统碳源与碳汇评估中存在的问题;湿地碳源与碳汇功能时空格局变异最新研究进展;影响湿地甲烷排放的因素;湿地碳循环过程对全球变暖的响应模式;湿地生态系统碳循环模拟。认为当前对湿地生态系统碳循环认识的局限性,是导致碳循环成为全球变暖互馈机制中不确定性的主要原因之一。针对中国当前湿地生态系统碳循环研究的特点,提出了中国未来湿地生态系统碳循环研究的焦点问题,即如何在气候变化及人类活动双重影响下,维持中国湿地生态系统现有碳储存库的功能,以及如何提高已退化湿地的固碳功能及潜力。

Foreign Research Progress on Carbon Cycle in Wetland Ecosystems

On the background of hydrology condition was altered by the global warming and human disturbance,organic carbon which was stored in wetland ecosystems at the history period would be released to the atmosphere extraordinary.Therefore,whether wetland ecosystem could still be a carbon sink received tremendous attentions.In this paper,we briefly reviewed on the issues about evaluating the carbon sink/source function of wetland ecosystem;Recent research advances in spatial and temporal variations of carbon sink/source function for wetland ecosystem;Impact factors on CH4 emissions in wetland ecosystems;Response mechanism of carbon process to global warming;as well as the modeling on carbon cycles in wetland ecosystems.We consider that the carbon cycles in wetland ecosystems is an important uncertainty source of global warming feedback mechanism,since that the above deficient researches.Considering the research status of carbon cycle in wetland ecosystem in China,we further proposed the key and priority scientific questions which should be focused.It is how to maintain the present carbon stocks of wetland ecosystem and enhance the function and potential of carbon sequestration capacity of degraded wetlands.