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陆地生态系统碳收支仍然是当前全球气候变化研究的重要内容,青藏高原作为全球气候变化的敏感区,使青藏高原草地生态系统在区域碳收支平衡中占有主导地位,但研究方法等不同使得碳收支估算结果存在很大的不确定性。气候变暖在一定程度上提高了高寒草地生态系统的植被初级生产力和生物量,由此补偿了气候变暖导致的土壤有机碳分解释量,使青藏高原草地植被仍然发挥着碳汇的功能。而人类放牧活动对草地生态系统的影响较为复杂。因此,如何区分气候变化和人类活动对生态系统的影响机制,定量评价未来气候变化和人类活动影响下,青藏高原生态系统碳源/汇格局的可能变化,是一个非常重要的研究方向,也是一个极大的挑战。
The terrestrial ecosystem carbon budget is still an important part of current global climate change research. As a sensitive area of global climate change, the Tibetan Plateau grassland ecosystem plays a dominant role in the regional carbon budget balance. However, due to different research methods There is a great deal of uncertainty about the carbon budget estimates. Climate warming increased the primary productivity and biomass of vegetation in the alpine grassland ecosystem to a certain extent, thus compensating for the release of soil organic carbon caused by climate warming and making the grassland vegetation in the Qinghai-Tibet Plateau still function as a carbon sink. The impact of human grazing on the grassland ecosystem is more complicated. Therefore, how to distinguish the impacts of climate change and human activities on ecosystems and quantitatively evaluate the possible changes in the carbon source / sink pattern in the Tibetan Plateau ecosystems under the influence of future climate change and human activities is a very important research direction and a Great challenge.