Response of tree-ring growth to climate at treeline ecotones in the Qilian Mountains, northwestern China |
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| Authors: | ZhiBin He WenZhi Zhao LiJie Zhang Hu Liu and ZhenXing Tang |
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| Institution: | Linze Inland River Basin Research Station, Chinese Ecosystem Research Network, Heihe Key Laboratory of Ecohydrology and Integrated River Basin Science, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;Linze Inland River Basin Research Station, Chinese Ecosystem Research Network, Heihe Key Laboratory of Ecohydrology and Integrated River Basin Science, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;University of Wuzhou, Wuzhou, Guangxi 543002, China;Linze Inland River Basin Research Station, Chinese Ecosystem Research Network, Heihe Key Laboratory of Ecohydrology and Integrated River Basin Science, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;Linze Inland River Basin Research Station, Chinese Ecosystem Research Network, Heihe Key Laboratory of Ecohydrology and Integrated River Basin Science, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China |
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| Abstract: | Climate constitutes the main limiting factor for tree-ring growth in high-elevation forests, and the relationship between tree-ring growth and climate is complex. Based on tree-ring chronology and meteorological data, the influence of precipitation, mean temperature and mean minimum temperature at yearly, seasonal and monthly scales on the tree-ring growth of Picea crossifolia was studied at treeline ecotones in the Qilian Mountains, northwestern China. The results show that growing season temperatures of previous and current years are important limiting factors on tree-ring growth, particularly June mean temperature and mean minimum temperature of current year. The precipitations in the previous winter and current spring have a positive correlation, and in the current fall has a negative correlation with tree-ring growth, but these correlations are not significant. Our results suggest that temperature controls tree-ring growth more strongly than precipitation at treeline ecotones in the Qilian Mountains. |
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| Keywords: | Qilian Mountains treeline ecotones climate tree-ring growth |
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