模拟增温对生态系统碳循环影响研究进展

气候变暖影响着生态系统碳循环,碳循环的变化反馈于气候变化。这两者的相互作用影响着未来气候变化的方向和强度。野外增温试验有助于了解生态系统碳循环对气候变化的响应及其机制,因此成为近年来的研究热点。生态系统所处的地理位置及相应的气候背景影响着碳循环对增温的响应。增温后不同生态系统的碳释放和碳固定均可表现为增加、减小或者无显著变化,因而生态系统净碳收支对气候变化响应多样。增温后土壤氮矿化速率、物候、生态系统物种组成和结构的变化间接影响着生态系统净碳收支。多年冻土区储存了大量的土壤有机碳,冻土融化后冻土有机碳分解将释放大量的CO2到大气中,正反馈于气候变暖,因而是目前野外增温试验对碳循环影响研究的焦点。

Research Advances in Ecosystem Carbon Cycling Response to Experimental Warming

Climatic warming affects carbon cyclying of the terrestrial ecosytem which could feedback to the climate change. Interaction between carbon cyclying and climate change determines the strength and direction of cliamte change in the future. Field warming manipulation experiments could be implemented to understand the terrestrial ecosystem responses and its mechanism to climate change. As a result, carbon cycling change becomes research focus in the filed manipulation experiments. Carbon cyle response to the warming manipulation is dependent on the location, type and microclimate of the ecosystem. Carbon sequestration and release could be increase, decrease or not change, which result in diverse response of net ecosystem productivity in warming experimetns. Net mineralization rate, phenology, community structure and composition change regulate and ecosytem carbon cycle change to warming. Permafrost response to climate change becoming research hot point due to its large carbon storge and its sensentivity to climate change.