作者
Roberto Silvestro,Maurizio Mencuccini,Raúl García‐Valdés,Serena Antonucci,Alberto Arzac,Franco Biondi,Valentinà Buttò,J. Julio Camarero,Filipe Campelo,Hervé Cochard,Katarina Čufar,Henri E. Cuny,Martı́n De Luı́s,Annie Deslauriers,E. Middleton,Marina V. Fonti,Patrick Fonti,Alessio Giovannelli,Patrick Fonti,Andreas Gruber,Vladimír Gryc,Rossella Guerrieri,Aylin Güney,Xiali Guo,Jian‐Guo Huang,Tuula Jyske,Jakub Kašpar,Alexander V. Kirdyanov,Tamir Klein,Audrey Lemay,Xiaoxia Li,Eryuan Liang,Anna Lintunen,Feng Liu,Fabio Lombardi,Qianqian Ma,Harri Mäkinen,Rayees Ahmad Malik,Hubert Morin,Jordi Martínez‐Vilalta,Stefan Mayr,Hubert Morin,Cristina Nabais,Pekka Nöjd,Walter Oberhuber,José Miguel Olano,Andrew P. Ouimette,Teemu Paljakka,Mikko Peltoniemi,Richard L. Peters,Ping Ren,Peter Prislan,Cyrille Rathgeber,Anna Sala,Antonio Saracino,Luigi Saulino,Pauliina Schiestl‐Aalto,Vladimir V. Shishov,Alexia Stokes,Raman Sukumar,Jean‐Daniel Sylvain,Roberto Tognetti,Václav Treml,Josef Urban,Hanuš Vavrčík,Joana Vieira,Georg von Arx,Yan Wang,Bao Yang,Qiao Zeng,Shaokang Zhang,Emanuele Ziaco,Peter Prislan
摘要
Abstract As major terrestrial carbon sinks, forests play an important role in mitigating climate change. The relationship between the seasonal uptake of carbon and its allocation to woody biomass remains poorly understood, leaving a significant gap in our capacity to predict carbon sequestration by forests. Here, we compare the intra-annual dynamics of carbon fluxes and wood formation across the Northern hemisphere, from carbon assimilation and the formation of non-structural carbon compounds to their incorporation in woody tissues. We show temporally coupled seasonal peaks of carbon assimilation (GPP) and wood cell differentiation, while the two processes are substantially decoupled during off-peak periods. Peaks of cambial activity occur substantially earlier compared to GPP, suggesting the buffer role of non-structural carbohydrates between the processes of carbon assimilation and allocation to wood. Our findings suggest that high-resolution seasonal data of ecosystem carbon fluxes, wood formation and the associated physiological processes may reduce uncertainties in carbon source-sink relationships at different spatial scales, from stand to ecosystem levels.