Effect of climate warming on the timing of autumn leaf senescence reverses after the summer solstice

• 成果类型: Article
• 署名作者: Zohner, Constantin M.; Mirzagholi, Leila; Renner, Susanne S.; Mo, Lidong; Rebindaine, Dominic; Bucher, Raymo; Palous, Daniel; Vitasse, Yann; Fu, Yongshuo H.; Stocker, Benjamin D.; Crowther, Thomas W.
• 署名单位: Swiss Federal Institutes of Technology Domain; ETH Zurich; Massachusetts Institute of Technology (MIT); Washington University (WUSTL); Charles University Prague; Swiss Federal Institutes of Technology Domain; Swiss Federal Institute for Forest, Snow & Landscape Research; Beijing Normal University; University of Bern; University of Bern
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-14097
• DOI: 10.1126/science.adf5098
• 发表日期: 2023-07-07
• 页码: 45-+
• 关键词: net ecosystem exchange; carbon-dioxide; phenology; vegetation; assimilation; GROWTH; PRODUCTIVITY; respiration; SEPARATION

摘要

Climate change is shifting the growing seasons of plants, affecting species performance and biogeochemical cycles. Yet how the timing of autumn leaf senescence in Northern Hemisphere forests will change remains uncertain. Using satellite, ground, carbon flux, and experimental data, we show that early-season and late-season warming have opposite effects on leaf senescence, with a reversal occurring after the year's longest day (the summer solstice). Across 84% of the northern forest area, increased temperature and vegetation activity before the solstice led to an earlier senescence onset of, on average, 1.9 +/- 0.1 days per degrees C, whereas warmer post-solstice temperatures extended senescence duration by 2.6 +/- 0.1 days per degrees C. The current trajectories toward an earlier onset and slowed progression of senescence affect Northern Hemisphere-wide trends in growing-season length and forest productivity.