Asymmetric temperature effect on leaf senescence and its control on ecosystem productivity
He, Lei (Chinese Academy of Agricultural Sciences. Institute of Agricultural Resources and Regional Planning)
Wang, Jian (Chinese Academy of Sciences. Institute of Geographical Sciences and Natural Resources Research)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Zohner, Constantin (ETH Zurich. Institute of Integrative Biology)
Crowther, Thomas W. (ETH Zurich. Institute of Integrative Biology)
Fu, Yongshuo H. (Beijing Normal University)
Zhang, Wenxin (Lund University. Department of Physical Geography and Ecosystem Science)
Xiao, Jingfeng (University of New Hampshire. Institute for the Study of Earth, Oceans, and Space)
Liu, Zhihua (Chinese Academy of Sciences. Institute of Applied Ecology)
Wang, Xufeng (Chinese Academy of Sciences. Northwest Institute of Eco-Environment and Resources)
Li, Jia-Hao (Chinese Academy of Sciences. Institute of Geographic Sciences and Natural Resources Research)
Li, Xiaojun (Université de Bordeaux)
Peng, Shouzhang (Northwest A&F University)
Xie, Yaowen (Lanzhou University)
Ye, Jiansheng (Lanzhou University)
Zhou, Chenghu (Guangdong Academy of Sciences. Guangzhou Institute of Geography)
Li, Zhao-Liang (Chinese Academy of Agricultural Sciences. Institute of Agricultural Resources and Regional Planning)

Data:	2024
Resum:	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.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Publicat a:	PNAS Nexus, Vol. 3, Issue 11 (November 2024) , art. gae477, ISSN 2752-6542

DOI: 10.1093/pnasnexus/pgae477
PMID: 39492950

9 p, 2.5 MB

El registre apareix a les col·leccions:
Documents de recerca > Documents dels grups de recerca de la UAB > Centres i grups de recerca (producció científica) > Ciències > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Articles > Articles de recerca
Articles > Articles publicats