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Radial growth of Larix sibirica was more sensitive to climate at low than high altitudes in the Altai Mountains, China

Zhou Peng, Huang Jian-Guo, Liang Hanxue, Rossi Sergio, Bergeron Yves, Shishov Vladimir V., Jiang Shaowei, Kang Jian, Zhu Huoxing et Dong Zhicheng. (2021). Radial growth of Larix sibirica was more sensitive to climate at low than high altitudes in the Altai Mountains, China. Agricultural and Forest Meteorology, 304-305, e108392.

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Considering climate change, there is no consensus on the impact of global warming on forest growth. Therefore, it is crucial to investigate the effects of climate change on tree radial growth. However, in arid eastern central Asia, the large-spatial scale radial growth-climate relationship remains poorly understood. In this study, we collected radial growth data from 13 Siberian larch (Larix sibirica) plots along an altitudinal gradient (1100–2200 m a.s.l.) in the Altai Mountains, China. Principal component analysis (PCA), bootstrapped correlation, and linear regression were conducted to detect and quantify the effects of climatic factors on radial growth and to reveal the spatial variation in the radial growth-climate relationship. Results showed that chronologies were clustered into low- and high-altitude groups. In the low-altitude group, the self-calibrating Palmer Drought Severity Index (scPDSI) in current April showed a strong positive impact on radial growth, while the previous September mean temperature and diurnal temperature range in previous July both significantly negatively affected radial growth. These three climate variables explained 63% of radial growth variance. Among them, the scPDSI, with a relative importance of 63%, was the primary limiting factor. In the high-altitude group, the current January maximum temperature and previous July precipitation were significantly negatively correlated with radial growth, while the June minimum temperature was significantly positively correlated with radial growth. These three climatic factors together contributed to 38% variance in radial growth. Furthermore, the plot-specific relationship between climate variables and radial growth varied significantly with different altitudes. As the climate becomes wetting and warming in the Altai Mountains, our result suggests that the radial growth might benefit in an altitude between 1800 and 1900 m a.s.l., where temperature and precipitation were both positively correlated with radial growth. These findings will provide a basis for sustainable forest management under global climate change.

Type de document:Article publié dans une revue avec comité d'évaluation
Version évaluée par les pairs:Oui
Date:15 Juillet 2021
Identifiant unique:10.1016/j.agrformet.2021.108392
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:Altai Mountains, climate change, drought, altitudinal gradient, Larix sibirica, tree ring
Déposé le:09 mai 2023 20:44
Dernière modification:09 mai 2023 20:44
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