Weakened connection between spring leaf-out and autumn senescence in the Northern Hemisphere
Zhang, Yichen (Peking University. College of Urban and Environmental Sciences)
Hong, Songbai (Peking University. Shenzhen Graduate School)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Xu, Hao (Peking University. College of Urban and Environmental Sciences)
Wang, Kai (Peking University. College of Urban and Environmental Sciences)
Zhang, Yao (Peking University. College of Urban and Environmental Sciences)
Lian, Xu (Columbia University. Department of Earth and EnvironmentalEngineering)
Piao, Shilong (Chinese Academy of Sciences. Institute of Tibetan Plateau Research)

Data:	2024
Resum:	Vegetation autumn phenology is critical in regulating the ecosystem carbon cycle and regional climate. However, the dominant drivers of autumn senescence and their temporal shifts under climate change remain poorly understood. Here, we conducted a multi-factor analysis considering both direct climatic controls and biological carryover effects from start-of-season (SOS) and seasonal peak vegetation activities on the end-of-season (EOS) to fill these knowledge gaps. Combining satellite and ground observations across the northern hemisphere, we found that carryover effects from early-to-peak vegetation activities exerted greater influence on EOS than the direct climatic controls on nearly half of the vegetated land. Unexpectedly, the carryover effects from SOS on EOS have significantly weakened over recent decades, accompanied by strengthened climatic controls. Such results indicate the weakened constraint of leaf longevity on senescence due to prolonged growing season in response to climate change. These findings underscore the important role of biological carryover effects in regulating vegetation autumn senescence under climate change, which should be incorporated into the formulation and enhancement of phenology modules utilized in land surface models.
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Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Acclimation ; Autumn senescence ; Biological carryover effect ; Climate change ; Phenology ; Vegetation dynamic
Publicat a:	Global change biology, Vol. 30, issue 7 (July 2024) , p. e174292024, ISSN 1365-2486

DOI: 10.1111/gcb.17429

Disponible a partir de: 2026-07-30 Postprint 42 p, 1.4 MB

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