Partial asynchrony of coniferous forest carbon sources and sinks at the intra-annual time scale

Author:

Silvestro RobertoORCID,Mencuccini MaurizioORCID,García-Valdés Raúl,Antonucci SerenaORCID,Arzac Alberto,Biondi FrancoORCID,Buttò Valentina,Camarero J. JulioORCID,Campelo FilipeORCID,Cochard Hervé,Čufar KatarinaORCID,Cuny Henri E.,de Luis MartinORCID,Deslauriers Annie,Drolet Guillaume,Fonti Marina V.,Fonti PatrickORCID,Giovannelli Alessio,Gričar Jožica,Gruber Andreas,Gryc Vladimír,Guerrieri RossellaORCID,Güney AylinORCID,Guo Xiali,Huang Jian-GuoORCID,Jyske Tuula,Kašpar Jakub,Kirdyanov Alexander V.,Klein TamirORCID,Lemay Audrey,Li Xiaoxia,Liang EryuanORCID,Lintunen Anna,Liu FengORCID,Lombardi FabioORCID,Ma QianqianORCID,Mäkinen HarriORCID,Malik Rayees A.ORCID,Martinez del Castillo EdurneORCID,Martinez-Vilalta JordiORCID,Mayr StefanORCID,Morin Hubert,Nabais Cristina,Nöjd Pekka,Oberhuber WalterORCID,Olano José M.,Ouimette Andrew P.,Paljakka Teemu V. S.ORCID,Peltoniemi MikkoORCID,Peters Richard L.,Ren Ping,Prislan PeterORCID,Rathgeber Cyrille B. K.ORCID,Sala Anna,Saracino AntonioORCID,Saulino LuigiORCID,Schiestl-Aalto PiiaORCID,Shishov Vladimir V.ORCID,Stokes Alexia,Sukumar Raman,Sylvain Jean-DanielORCID,Tognetti RobertoORCID,Treml Václav,Urban JosefORCID,Vavrčík HanušORCID,Vieira Joana,von Arx GeorgORCID,Wang Yan,Yang BaoORCID,Zeng Qiao,Zhang Shaokang,Ziaco EmanueleORCID,Rossi Sergio

Abstract

AbstractAs 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.

Funder

Fonds de Recherche du Québec - Nature et Technologies

Publisher

Springer Science and Business Media LLC

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