Vegetation is the main body of the terrestrial ecosystem. It plays an important role in maintaining ecological balance, regulating the water cycle, and promoting the flow of matter and energy. It is often used as an indicator of climate change in the dynamic monitoring and evaluation of the ecosystem.
Research shows that ecologically fragile areas are sensitive to climate change and are signal amplifiers for global climate change, while High Asia (HMA), as a sensitive place for climate response in Asia and the world, is important for regional environmental response to climate change. Component, exploring the dynamics and driving mechanisms of HMA vegetation is of great significance for in-depth revealing of the impact of climate change on terrestrial ecosystems and their feedback.
a: High Asia region, HMA growing season from 1982 to 2015; (b) NDVI (c) temperature-Tmp and (d) spatial distribution of precipitation-Pre-
remote sensing and ground vegetation observation The data shows that climate warming promotes the greening of global vegetation, and the temperature rise of HMA is more than twice the global average.
In such a severe climate warming, how will the vegetation dynamics of HMA change? In response to this scientific question, Chinese Academy of Sciences Xinjiang Institute of Ecology and Geography State Key Laboratory of Desert and Oasis Ecology Researcher Chen Yaning team used the latest vegetation and meteorological data (GIMMS3g NDVI and CRU) to investigate the vegetation dynamics in the high Asian region And quantified the contribution rate of climate change in vegetation dynamics.
1982-2015 HMA growth season (GS), spring (SP), summer (SU) and autumn (FA) vegetation dynamic driving factors analysis
Research shows that in the past 30 years, HMA overall Shows a "warm and wet" trend, and the temperature continues to rise. The precipitation increased from 1982 to 1998 (1.16mm yr-1), but it has reversed since 1998 (-2.73mm yr-1).At the same time, HMA's NDVI had an increasing trend (0.012/10yr) before 1998, after which the trend reversed and declined (-0.005/10yr). The main reason for the browning of HMA vegetation is the dual effects of climate warming and precipitation changes.
HMA temperature has risen above the global average level, and the water vapor pressure deficit caused by global warming has increased, which has accelerated the loss and consumption of surface water, and also exacerbated the deficit of soil moisture. The abnormal increase in land evapotranspiration far exceeds that of precipitation, and regional water shortages have intensified. Climate change is the main factor driving vegetation and water dynamics, with the largest proportion reaching 41.9%.
related research results are titled Continuous warming shift greening towards browning in the Southeast and Northwest High Mountain Asia , published on _Reportspan2span em237em 40.
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