College of Urban and Environmental Sciences and MOE Laboratory for Earth Surface Processes, Peking University, Beijing, 100871, China.
Harvard China Project, School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA.
Nat Commun. 2019 Jan 14;10(1):195. doi: 10.1038/s41467-018-08229-z.
While many studies have reported that drought events have substantial negative legacy effects on forest growth, it remains unclear whether wetness events conversely have positive growth legacy effects. Here, we report pervasive and substantial growth enhancement after extreme wetness by examining tree radial growth at 1929 forest sites, satellite-derived vegetation greenness, and land surface model simulations. Enhanced growth after extreme wetness lasts for 1 to 5 years and compensates for 93 ± 8% of the growth deficit after extreme drought across global water-limited regions. Remarkable wetness-enhanced growths are observed in dry forests and gymnosperms, whereas the enhanced growths after extreme wetness are much smaller in wet forests and angiosperms. Limited or no enhanced growths are simulated by the land surface models after extreme wetness. These findings provide new evidence for improving climate-vegetation models to include the legacy effects of both drought and wet climate extremes.
虽然许多研究报告指出干旱事件对森林生长有实质性的负面影响，但目前尚不清楚潮湿事件是否会产生相反的积极生长遗留效应。在这里，我们通过检查 1929 个森林站点的树木径向生长、卫星衍生的植被绿色度和陆地表面模型模拟，报告了极端潮湿后普遍而显著的生长增强。极端潮湿后的增强生长持续 1 至 5 年，补偿了全球水分受限地区极端干旱后 93±8%的生长不足。在干旱森林和裸子植物中观察到显著的潮湿增强生长，而在潮湿森林和被子植物中，潮湿增强生长要小得多。陆地表面模型模拟的极端潮湿后增强生长有限或不存在。这些发现为改进气候-植被模型提供了新的证据，以包括干旱和潮湿气候极端事件的遗留效应。
