Growth and response patterns of Picea crassifolia and Pinus tabuliformis to climate factors in the Qilian Mountains,northwest China |
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Affiliation: | 1. Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, 723 Xingke Road, Tianhe District, Guangzhou 510650, China;2. Center of Plant Ecology, Core Botanical Garden, Chinese Academy of Sciences, 723 Xingke Road, Tianhe District, Guangzhou 510650, China;3. University of Chinese Academy of Sciences, 19(A) Yuquan Road, Shijingshan District, Beijing 100049, China;4. Institute of Loess Plateau, Shanxi University, Key Laboratory of Ecological Restoration of Loess Plateau, Taiyuan, Shanxi Province 030006, China;5. Département de Sciences Fondamentales, Université du Québec à Chicoutimi, 555 Boulevard de l''Université, Chicoutimi, G7H 2B1, QC, Canada;6. Institut de recherche sur les forêts, Université du Québec en Abitibi-Témiscamingue (UQAT), Rouyn-Noranda, QC J9 × 5E4, Canada;7. Laboratory for integral studies of forest dynamics of Eurasia, Siberian Federal University, Krasnoyarsk, 660036, Russian Federation;8. International Centre for Bamboo and Rattan No. 8 Futong Dongdajie, Wangjing Area, Chaoyang District, Beijing 100102, China;9. School of Life Sciences, Guangzhou University, Guangzhou Higher Education Mega Center, Guangzhou, China |
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Abstract: | Different tree species exhibit different phenological and physiological characteristics, leading to complexity in inter-species comparison of stem radial growth response to climate change. This study explored the climate-growth responses of Qinghai spruce (Picea crassifolia) and Chinese pine (Pinus tabulaeformis) in the Qilian Mountains, Northwest China. Meanwhile, Vaganov-Shashkin model (VS-oscilloscope) was used to simulate the relationships between radial growth rates and phenology. The results showed that 1) in their radial growth patterns, Qinghai spruce showed a significant increasing trend, while Chinese pine showed a decreasing trend, and Qinghai spruce has a longer growing season than Chinese pine. 2) For the radial growth-climate dynamic response, Qinghai spruce was influenced in an unstable manner by the mean temperature in the mid-growing season of the current year and the late growing season of the previous year and by the mean minimum temperature in the mid-growing season of the current year, while Chinese pine was influenced in a stable manner by the mean temperature and mean maximum temperature during the growing season of the current year. 3) The radial growth rates of the two conifer species were limited by temperature at the initiation and cessation of growth and by soil moisture at the peak of growth. But Chinese pine was more severely affected by soil moisture than Qinghai spruce in the middle of growth. Therefore, different management and restoration measures should be taken based on the differences in ecological responses and physical and physiological properties of the two conifer species to climate change in the subalpine forest ecosystems in the semiarid and arid regions of Northwest China. |
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Keywords: | Dendroecology Climate change VS-oscilloscope Growth responses Qilian Mountains |
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