数字农科院2.0

Asymmetric temperature effect on leaf senescence and its control on ecosystem productivity

文献类型： 外文期刊

作者： Lei He;Jian Wang;Josep Peñuelas;Constantin M. Zohner;Thomas W. Crowther;Yongshuo Fu;Wenxin Zhang;Jingfeng Xiao;Zhihua Liu;Xufeng Wang;Jia Hao Li;Xiaojun Li;Shouzhang Peng;Yaowen Xie;Jian Sheng Ye;Chenghu Zhou;Zhao Liang Li

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期刊名称： PNAS Nexus

ISSN： 2752-6542

年卷期： 2024 年 3 卷 11 期

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收录情况： 无来源刊（2024版）

摘要： Widespread autumn cooling occurred in the northern hemisphere (NH) during the period 2004-2018, primarily due to the strengthening of the Pacific Decadal Oscillation and Siberian High. Yet, while there has been considerable focus on the warming impacts, the effects of natural cooling on autumn leaf senescence and plant productivity have been largely overlooked. This gap in knowledge hinders our understanding of how vegetation adapts and acclimates to complex climate change. In this study, we utilize over 36,000 in situ phenological time series from 11,138 European sites dating back to the 1950s, and 30 years of satellite greenness data (1989-2018), to demonstrate that leaf senescence dates (LSD) in northern forests responded more strongly to warming than to cooling in autumn. Specifically, a 1 °C increase in temperature caused 7.5 ± 0.2 days' delay in LSD, whereas a 1 °C decrease led to an advance of LSD with 3.3 ± 0.1 days (P < 0.001). This asymmetry in temperature effects on LSD is attributed to greater preoverwintering plant-resource acquisition requirements, lower frost risk, and greater water availability under warming than cooling conditions. These differential LSD responses highlight the nonlinear impact of temperature on autumn plant productivity, which current process-oriented models fail to accurately capture. Our findings emphasize the need to account for the asymmetric effects of warming and cooling on leaf senescence in model projections and in understanding vegetation-climate feedback mechanisms.

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