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Growth rate rather than growing season length determines wood biomass in dry environments

Ren Ping, Ziaco Emanuele, Rossi Sergio, Biondi Franco, Prislan Peter et Liang Eryuan. (2019). Growth rate rather than growing season length determines wood biomass in dry environments. Agricultural and Forest Meteorology, 271, p. 46-53.

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URL officielle: http://dx.doi.org/doi:10.1016/j.agrformet.2019.02....

Résumé

A number of studies have suggested that growing season length determines carbon sequestration of forest ecosystems. Given the possibility that drought-induced growth decline will be caused by a prolonged growing season under a warming climate, we investigated the effect of growth rate and duration of xylem production on annual wood biomass in drought-prone environments. We analyzed the intra-annual dynamics of wood formation in Qilian junipers (Juniperus przewalskii) from the semi-arid north-eastern Tibetan Plateau, China (2009–2014) and in ponderosa pine (Pinus ponderosa) from the hyperarid Mojave Desert in Nevada, USA (2015–2016). Most variability in the number of xylem cells (Ncell) was related to growth rate (rm) rather than duration of cell production (Dcell). At the Tibetan sites, 69.9% and 54.7% of variability in Ncell was attributable to rm for the lower and upper treeline, respectively. Within the Mojave Desert site, 53.9% of the variability in Ncell was related to rm. The growth rate in the Tibetan Plateau forest is affected by minimum temperature and precipitation. Thus, rm is a primary control on wood biomass in conifer species of semi-arid forests. Under warmer and drier conditions, a longer growing season will not benefit xylem formation of conifers, and in turn warming-induced drought could limit carbon sequestration by reducing the rate of cell production.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:01681923
Volume:271
Pages:p. 46-53
Version évaluée par les pairs:Oui
Date:2019
Identifiant unique:10.1016/j.agrformet.2019.02.031
Sujets:Sciences naturelles et génie > Sciences appliquées > Climatologie et météorologie
Sciences naturelles et génie > Sciences appliquées > Foresterie et sciences du bois
Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Département, module, service et unité de recherche:Départements et modules > Département des sciences fondamentales
Unités de recherche > Centre de recherche sur la Boréalie (CREB)
Mots-clés:conifer, wood production, carbon sequestration, growing season length, growth rate, drought stress
Déposé le:01 juin 2023 15:33
Dernière modification:01 juin 2023 15:33
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