影响青藏高原植被生理过程与大气CO2浓度及气候变化的相互作用

利用一陆面过程模式,初步模拟研究了青藏高原夏季风盛行期植被生理过程与大气CO2浓度及气候变化的相互作用。结果表明,气候以及大气CO2浓度变化对青藏高原地区的植被生理过程有较明显的影响,高温、高温和高CO2浓度将加强高原植被的光合作用和呼吸作用,有利于植被生长。高原植被也可通过生理过程,产生净CO2呼收,降低大气CO2含量,起到调整温室效应的作用,从而影响全球气候变化;当气温升高、大气CO2增加时,这种作用更加有效。青藏高原地区大气CO2浓度加倍,对高原地区气候的直接影响不明显。植被的存在也会影响区域气候变化,并可通过改变高原热源,进而影响高原及其周边地区气候变化。文中还归纳出了植被生理与气候相互作用的简单概念模型。

Interactions between Physiological Process of the Tibetan Plateau Vegetation and CO_2 Concentration and Climate Change

We rudimentarily simulated the interactions between the physiological process of the Tibetan Plateau vegetation and CO2 concentration and climate change during summer monsoon by using a land surface model. The results show that the plateau vegetation physiological process is clearly affected by climate and CO2 concentration of the atmosphere. It would be benefit to the photosynthesis and respiration of the vegetation if the climate is warmer, the soil wetter and the CO2 concentration higher. The vegetation can also absorb the CO2 of the atmosphere by its physiological process. This could weaken the warming caused by CO2 "greenhouse effect". And this effect would be more effective when the CO2 concentration is increased and the climate is warmer. By this process, the vegetation can affect the regional and even the global climate change. But the direct influence of the increase of CO2 concentration on the climate over the Tibetan Plateau may be unobvious. On the other side, the vegetation can also directly affect the climate of the plateau. And by changing the land surface heat source, the vegetation would further affect the climate of the Tibetan Plateau and its surroundings. A simple conception model of the interactions between the vegetation physiological process and the climate is also concluded.