Effect of climate warming on the timing of autumn leaf senescence reverses after the summer solstice
L'effet du réchauffement climatique sur le moment de la sénescence des feuilles d'automne s'inverse après le solstice d'été
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.
Global warming is changing the timing of photosynthesis, with leaves emerging earlier in spring in the temperate and boreal zones. A longer growing season could mean greater carbon sequestration in forests, but the timing of leaves falling in autumn depends on multiple cues, making it difficult to predict. Zohner et al. investigated how leaf senescence relates to day length, temperature, and early-season photosynthesis across northern forests using remote sensing, ground observations, and experimental data. They found that warming had opposing effects on senescence dates depending on when it occurred: Warmer springs with higher photosynthesis correlated with earlier senescence, wheras warmer temperatures in autumn delayed senescence. Incorporating this shift in knowledge may improve predictions of vegetation response to climate change. -BEL </p>
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