Warming does not delay the start of autumnal leaf coloration but slows its progress rate

作者：Nan Jiang, Miaogen Shen, Philippe Ciais, Matteo Campioli, Josep Peñuelas, Christian Körner, Ruyin Cao, Shilong Piao, Licong Liu, Shiping Wang, Eryuan Liang, Nicolas Delpierre, Kamel Soudani, Yuhan Rao, Leonardo Montagnani, Lukas Hörtnagl, Eugénie Paul‐Limoges, Ranga B. Myneni, Georg Wohlfahrt, Yongshuo H. Fu, Ladislav Šigut, Andrej Varlagin, Jin Chen, Yanhong Tang, Wenwu Zhao · 发表于：Global Ecology and Biogeography · 年份：2022 · DOI：10.1111/geb.13581 · 被引用次数：35 · 研究领域：Remote Sensing in Agriculture、Plant and animal studies、Species Distribution and Climate Change

Abstract Aim Initiation of autumnal leaf senescence is crucial for plant overwintering and ecosystem dynamics. Previous studies have focused on the advanced stages of autumnal leaf senescence and reported that climatic warming delayed senescence, despite the fundamental differences among the stages of senescence. However, the timing of onset of leaf coloration ( D LCO ), the earliest visual sign of senescence, has rarely been studied. Here, we assessed the response of D LCO to temperature. Location 30–75° N in the Northern Hemisphere. Time period 2000–2018. Major taxa studied Deciduous vegetation. Methods We retrieved D LCO from high‐temporal‐resolution satellite data, which were then validated by PhenoCam observations. We investigated the temporal changes in D LCO and the relationship between D LCO and temperature by using satellite and ground observations. Results D LCO was not significantly ( p > .05) delayed between 2000 and 2018 in 94% of the area. D LCO was positively ( p < .05) correlated with pre‐ D LCO mean daily minimum temperature ( T min ) in only 9% of the area, whereas the end of leaf coloration ( D LCE ) was positively correlated with pre‐ D LCE mean T min over a larger area (34%). Further analyses showed that warming slowed the progress of leaf coloration. Interestingly, D LCO was less responsive to pre‐ D LCO mean T min in areas where daylength was longer across the Northern Hemisphere, particularly for woody vegetation. Main conclusions The rate of pro...