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Response of Tree Recruitment to Climatic Variability in the Alpine Treeline Ecotone of the Qilian Mountains, Northwestern China

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Abstract:

There is ample evidence of the ecological impacts of climate change, and treeline ecotones resulting from environmental gradients are a particularly sensitive indicator of climate change. However, the response of alpine treelines to climatic variability in semiarid mountain regions is not clearly understood. In this study, we analyzed the impacts of temperature and precipitation on tree recruitment in treeline ecotones in the Qilian Mountains of northwestern China from 1957 to 2007. The results showed that climate warming has increased tree recruitment. Tree recruitment was significantly positively correlated with the mean growing season temperature and with the mean minimum temperature in June and in winter. Treeline elevation shifted upward by 5.7 to 13.6 m from 1907 to 1957 and by 6.1 to 10.4 m from 1957 to 1980, but did not appear to change after 1980. Our results suggest that temperature controls treeline dynamics more strongly than precipitation in the Qilian Mountains, and support the hypothesis that treeline dynamics are strongly linked to growing season and winter temperatures.

Keywords: Qilian Mountains; alpine treeline; climatic variability; tree recruitment

Document Type: Research Article

DOI: http://dx.doi.org/10.5849/forsci.11-044

Publication date: February 9, 2013

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  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
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