北京师范大学吴秀晨课题组报道了春季物候对北半球生态系统干旱恢复的影响。2023年1月19日出版的《自然—气候变化》杂志发表了这项成果。

研究组使用多个遥感数据集，研究发现北半球中纬度和高纬度地区超过一半的生态系统未能在一个生长季节内从极端干旱中恢复过来。当极端干旱发生在生长季中期时，干旱年的早春物候减缓了干旱的恢复。次年春季物候的延迟减缓了所有植被类型的干旱恢复(春季物候的重要性在46%至58%之间)。物候学对干旱恢复的影响与其他众所周知的干旱后气候因素相当或更大。研究结果强调，将植被物候与干旱之间的相互作用纳入地球系统模型，可以准确量化生态系统的恢复力。

据悉，生态系统从严重干旱中恢复所需的时间是生态恢复力的一个关键组成部分。然而，人们对物候对干旱恢复的影响了解甚少。这些影响集中在物候变化如何影响生物物理反馈、植被生长，并最终影响恢复本身。

附：英文原文

Title: Widespread spring phenology effects on drought recovery of Northern Hemisphere ecosystems

Author: Li, Yang, Zhang, Wen, Schwalm, Christopher R., Gentine, Pierre, Smith, William K., Ciais, Philippe, Kimball, John S., Gazol, Antonio, Kannenberg, Steven A., Chen, Anping, Piao, Shilong, Liu, Hongyan, Chen, Deliang, Wu, Xiuchen

Issue&Volume: 2023-01-19

Abstract: The time required for an ecosystem to recover from severe drought is a key component of ecological resilience. The phenology effects on drought recovery are, however, poorly understood. These effects centre on how phenology variations impact biophysical feedbacks, vegetation growth and, ultimately, recovery itself. Using multiple remotely sensed datasets, we found that more than half of ecosystems in mid- and high-latitudinal Northern Hemisphere failed to recover from extreme droughts within a single growing season. Earlier spring phenology in the drought year slowed drought recovery when extreme droughts occurred in mid-growing season. Delayed spring phenology in the subsequent year slowed drought recovery for all vegetation types (with importance of spring phenology ranging from 46% to 58%). The phenology effects on drought recovery were comparable to or larger than other well-known postdrought climatic factors. These results strongly suggest that the interactions between vegetation phenology and drought must be incorporated into Earth system models to accurately quantify ecosystem resilience.

DOI: 10.1038/s41558-022-01584-2

Source: https://www.nature.com/articles/s41558-022-01584-2