Spatiotemporal inequality in land water availability amplified by global tree restoration
Zan, Beilei ， Ge, Jun ， Mu, Mengyuan ， Sun, Qiaohong ， Luo, Xing ， Wei, Jiangfeng
2024-09-01 NATURE WATER 2024 2(卷), 9(期), (null页)
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Afforestation can influence evapotranspiration (E) and precipitation (P), thereby altering water availability (known as P - E) on land. However, such effects on P - E have rarely been examined in the context of seasonal and spatial variations in background P - E conditions. Here we show the impacts of global tree restoration on P - E under spatiotemporally varying P - E conditions. Afforestation amplifies seasonal contrasts in P - E, resulting in higher P - E in the high P - E season and/or lower P - E in the low P - E season, over approximately two-thirds of the land area. Afforestation also amplifies spatial contrasts in P - E, leading to higher P - E in the high P - E regions but lower P - E in the low P - E regions. This study underscores the importance of considering background P - E conditions when evaluating the hydrological effects of afforestation, with important implications for both forestry and water management.
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