Chen Jinlong, Shao Zhenfeng, Deng Xiongjie, Huang Xiao, Dang Chaoya
State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430072, China.
State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430072, China.
Sci Total Environ. 2023 Oct 15;895:165071. doi: 10.1016/j.scitotenv.2023.165071. Epub 2023 Jun 24.
Global climate change is expected to further intensify the global water cycle, leading to more rapid evaporation and more intense precipitation. At the same time, the growth and expansion of natural vegetation caused by climate change and human activities create potential conflicts between ecosystems and humans over available water resources. Clarifying how terrestrial ecosystem evapotranspiration responds to global precipitation and vegetation facilitates a better understanding of and prediction for the responses of global ecosystem energy, water, and carbon budgets under climate change. Relying on the spatial and temporal distribution of evapotranspiration, precipitation, and solar-induced chlorophyll fluorescence (SIF) from remote sensing platforms, we decouple the interaction mechanism of evapotranspiration, precipitation, and vegetation in linear and nonlinear scenarios using correlation and partial correlation analysis, multiple linear regression analysis, and binning. Major conclusions are as follows: (1) As a natural catalyst of the global water cycle, vegetation plays a crucial role in regulating the relationship between climate change and the water‑carbon-energy cycle. (2) Vegetation, a key parameter affecting the water cycle, participates in the entire water cycle process. (3) The increase in vegetation productivity and photosynthesis plays a dominant role in promoting evapotranspiration in vegetated areas, while the increase in precipitation dominates the promotion of evapotranspiration in non-vegetated areas.
预计全球气候变化将进一步加剧全球水循环，导致蒸发加快、降水增强。与此同时，气候变化和人类活动引起的自然植被生长与扩张，在生态系统与人类之间就可用水资源产生了潜在冲突。阐明陆地生态系统蒸散如何响应全球降水和植被，有助于更好地理解和预测气候变化下全球生态系统能量、水分和碳收支的响应。基于遥感平台获取的蒸散、降水和太阳诱导叶绿素荧光（SIF）的时空分布，我们运用相关性和偏相关性分析、多元线性回归分析以及分箱法，在线性和非线性情景下解耦蒸散、降水和植被的相互作用机制。主要结论如下：（1）植被作为全球水循环的自然催化剂，在调节气候变化与水-碳-能量循环的关系中起着关键作用。（2）植被作为影响水循环的关键参数，参与了整个水循环过程。（3）植被生产力和光合作用的增加在促进植被覆盖地区的蒸散方面起主导作用，而降水增加在促进无植被覆盖地区的蒸散方面占主导地位。
