期刊
SCIENCE BULLETIN
卷 66, 期 14, 页码 1462-1471出版社
ELSEVIER
DOI: 10.1016/j.scib.2021.02.023
关键词
Ensemble empirical mode decomposition; Global carbon cycle; Global vegetation primary productivity; Leveling off of Earth greening; Global warming; Soil water limitation
资金
- National Key Research and Development Program of China [2017YFA0604700]
- National Natural Science Foundation of China [41722104]
- Key Research Project of Chinese Academy of Sciences [QYZDY-SSW-DQC025, 2019DC0027]
- Euro-pean Research Council Synergy [ERC2013SyG610028 IMBALANCEP]
- Spanish Government [CGL201679835]
- Catalan Government [SGR 20171005]
- Ministry of Natural Resources of the People's Republic of China [GS (2021) 183]
Global vegetation photosynthesis and productivity have significantly increased since the 1980s, but by 2016, the growth began to level off with some areas showing browning. This was mainly due to increasing soil water limitations caused by drought expansion, indicating that the impacts of water stress may offset the benefits of global vegetation greening.
Global vegetation photosynthesis and productivity have increased substantially since the 1980s, but this trend is heterogeneous in both time and space. Here, we categorize the secular trend in global vegetation greenness into sustained greening, sustained browning and greening-to-browning. We found that by 2016, increased global vegetation greenness had begun to level off, with the area of browning increasing in the last decade, reaching 39.0 million km2 (35.9% of the world's vegetated area). This area is larger than the area with sustained increasing growth (27.8 million km2, 26.4%); thus, 12.0% +/- 3.1% (0.019 +/- 0.004 NDVI a-1) of the previous earlier increase has been offset since 2010 (2010-2016, P < 0.05). Global gross primary production also leveled off, following the trend in vegetation greenness in time and space. This leveling off was caused by increasing soil water limitations due to the spatial expansion of drought, whose impact dominated over the impacts of temperature and solar radiation. This response of global gross primary production to soil water limitation was not identified by land submodels within Earth system models. Our results provide empirical evidence that global vegetation greenness and primary production are offset by water stress and suggest that as global warming continues, land submodels may overestimate the world's capacity to take up carbon with global vegetation greening. (c) 2021 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
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