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Anomalous temperature–growth response of Abies faxoniana to sustained freezing stress along elevational gradients in China’s Western Sichuan Province

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Abstract

A network of ten Faxon fir tree-ring width chronologies was constructed from sites ranging in elevation from 3,000 to 3,450 m in the Wolong Natural Reserve in Western Sichuan Province, China. The site chronologies display significant inter-site correlations (mean R = 0.647, p < 0.001) and the first principal component (PC1) accounts for 68.32 % of the total variation of the chronologies, implying a high degree of similarity in growth variation among the elevation gradients. Correlation analysis using monthly climate data indicates that the radial growth response of Faxon fir along the elevation gradients is markedly similar to common climatic signals, such as sunshine duration (positive) and cloud cover (negative), from January to March. Thus, it appears that winter freezing stress, which is caused by low solar radiation and high cloudiness, is the major environmental factor regulating the growth of trees across the elevational gradients. In addition, the site chronologies have no elevation-dependent growth responses to temperature or precipitation. Irrespective of the elevational differences of the sample sites, an anomalous reduction in radial growth occurred consistently since the 1960s, diverging from the instrumental temperature records since the 1990s. The cause of this divergence may be ascribed to the recent accelerated winter freezing stress and its role in controlling radial growth.

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Acknowledgments

This research was supported by Natural Science Foundation of China (Grant No. 41071039, 31000210) and National Science Foundation for Post-doctoral Scientists of China (Grant No. 20100470560). We greatly thank Hong-Yan Qiu and Cai-Yun Liu of the Tree-Ring Laboratory, Institute of Botany, Chinese Academy of Sciences for the assistance of ring-width measurement. We are grateful to Patricia Fisher for language correction of this manuscript, Jin-Long Zhang, Guo-Fang Liu and Yu Liu for the help of data analysis. We are also appreciative of the field assistance received from Desheng Forest Ecology Station in the Wolong Natural Reserve.

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Li, Z.S., Liu, G.H., Fu, B.J. et al. Anomalous temperature–growth response of Abies faxoniana to sustained freezing stress along elevational gradients in China’s Western Sichuan Province. Trees 26, 1373–1388 (2012). https://doi.org/10.1007/s00468-012-0712-9

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