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Title: Woody biomass production lags stem-girth increase by over one month in coniferous forests
Authors: Cuny, Henri E. 
Rathgeber, Cyrille B. K. 
Frank, David 
Fonti, Patrick 
Mäkinen, Harri 
Prislan, Peter 
Rossi, Sergio 
del Castillo, Edurne Martinez 
Campelo, Filipe 
Vavrčík, Hanuš 
Camarero, Jesus Julio 
Bryukhanova, Marina V. 
Jyske, Tuula 
Gričar, Jožica 
Gryc, Vladimír 
De Luis, Martin 
Vieira, Joana 
Čufar, Katarina 
Kirdyanov, Alexander V. 
Oberhuber, Walter 
Treml, Vaclav 
Huang, Jian-Guo 
Li, Xiaoxia 
Swidrak, Irene 
Deslauriers, Annie 
Liang, Eryuan 
Nöjd, Pekka 
Gruber, Andreas 
Nabais, Cristina 
Morin, Hubert 
Krause, Cornelia 
King, Gregory 
Fournier, Meriem 
Issue Date: 2015
Project: FPS COST Action STReESS (FP1106) 
Serial title, monograph or event: Nature Plants
Volume: 1
Issue: 11
Abstract: Wood is the main terrestrial biotic reservoir for long-term carbon sequestration(1), and its formation in trees consumes around 15% of anthropogenic carbon dioxide emissions each year(2). However, the seasonal dynamics of woody biomass production cannot be quantified from eddy covariance or satellite observations. As such, our understanding of this key carbon cycle component, and its sensitivity to climate, remains limited. Here, we present high-resolution cellular based measurements of wood formation dynamics in three coniferous forest sites in northeastern France, performed over a period of 3 years. We show that stem woody biomass production lags behind stem-girth increase by over 1 month. We also analyse more general phenological observations of xylem tissue formation in Northern Hemisphere forests and find similar time lags in boreal, temperate, subalpine and Mediterranean forests. These time lags question the extension of the equivalence between stem size increase and woody biomass production to intra-annual time scales(3, 4, 5, 6). They also suggest that these two growth processes exhibit differential sensitivities to local environmental conditions. Indeed, in the well-watered French sites the seasonal dynamics of stem-girth increase matched the photoperiod cycle, whereas those of woody biomass production closely followed the seasonal course of temperature. We suggest that forecasted changes in the annual cycle of climatic factors(7) may shift the phase timing of stem size increase and woody biomass production in the future.
DOI: 10.1038/nplants.2015.160
Rights: embargoedAccess
Appears in Collections:I&D CFE - Artigos em Revistas Internacionais

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