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Drought resistance enhanced by tree species diversity in global forests
Nature Geoscience ( IF 18.3 ) Pub Date : 2022-09-19 , DOI: 10.1038/s41561-022-01026-w
Dan Liu, Tao Wang, Josep Peñuelas, Shilong Piao

Restoring species diversity is proposed as a strategy to improve ecosystem resistance to extreme droughts, but the impact of species diversity on resistance has not been evaluated across global forests. Here we compile a database that contains tree species richness from more than 0.7 million forest plots and satellite-based estimation of drought resistance. Using this database, we provide a spatially explicit map of species diversity effect on drought resistance. We found that higher species diversity could notably enhance drought resistance in about half of global forests but was spatially highly variable. Drought regimes (frequency and intensity) and climatic water deficit were important determinants of differences in the extent that species diversity could enhance forest drought resistance among regions, with such benefits being larger in dry and drought-prone forests. According to a predictive model of species diversity effect, the conversion of current monoculture to mixed-species tree plantations could improve drought resistance, with the large increase in dry forests. Our findings provide evidence that species diversity could buffer global forests against droughts. Restoration of species diversity could then be an effective way to mitigate the impact of extreme droughts on large scales, especially in dry and drought-prone regions.



中文翻译:

全球森林树种多样性增强抗旱性

恢复物种多样性被提议作为提高生态系统对极端干旱抵抗力的一种策略,但尚未在全球森林中评估物种多样性对抵抗力的影响。在这里,我们编译了一个数据库,其中包含来自超过 70 万个森林地块的树种丰富度和基于卫星的抗旱性估计。使用该数据库,我们提供了物种多样性对抗旱性影响的空间明确地图。我们发现,较高的物种多样性可以显着增强全球大约一半森林的抗旱性,但在空间上存在很大差异。干旱状况(频率和强度)和气候缺水是决定物种多样性在不同区域间增强森林抗旱性的程度差异的重要因素,在干旱和易干旱的森林中,这种好处更大。根据物种多样性效应的预测模型,当前的单一种植向混合树种人工林的转变可以提高抗旱性,干旱森林大量增加。我们的研究结果提供了证据,表明物种多样性可以缓冲全球森林抵御干旱。然后,恢复物种多样性可能是大规模减轻极端干旱影响的有效方法,特别是在干旱和干旱易发地区。我们的研究结果提供了证据,表明物种多样性可以缓冲全球森林抵御干旱。然后,恢复物种多样性可能是大规模减轻极端干旱影响的有效方法,特别是在干旱和干旱易发地区。我们的研究结果提供了证据,表明物种多样性可以缓冲全球森林抵御干旱。然后,恢复物种多样性可能是大规模减轻极端干旱影响的有效方法,特别是在干旱和干旱易发地区。

更新日期:2022-09-20
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