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Influence of Human Pressure on Forest Resources and Productivity at Stand and Tree Scales: The Case Study of Yunnan Pine in SW China

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Journal of Mountain Science 2013年第5期10卷 824-832页

作者： Thomas M.HINCKLEY Phillip CHI Keala HAGMANN Stevan HARRELL Amanda Henck SCHMIDT lauren urgenson Zong-yong ZENG School of Environmental and Forest Sciences University of Washington Department of Anthropology and School of Environmental and Forest Sciences University of Washington Geology Department Oberlin College College of Life Sciences Sichuan University

This paper examines human impact on stands and individual trees of Pinus yunnanensis growing near the small mountain villages of Pianshui and Yangjuan in southwestern Sichuan Province,*** an effort to assess whether use of these forests was sustainable,we examined the effects of human use in two ***,we directly measured the effect of cutting branches,for fuel and fodder,on tree *** hypothesized that branch cutting would negatively impact tree *** established 12 plots on four hills and compared 14 pairs of trees,one tree in each pair with an apparently full crown and the other with a considerable portion of the crown ***,we assessed stand and tree properties over a 500 m elevation gradient above the villages where we hypothesized that as elevation increases,stand and tree properties should show fewer human *** extensive branch cutting reduced the live crown,tree height and diameter,compensatory processes likely enabled trees to recover and to add basal area increments(BAIs) similar to those added by trees with full *** and stands close to villages showed less growth and lower basal areas,respectively,than stands and trees at intermediate or distant elevations from *** relatively close to the villages showed considerable effects of human-related disturbances such as branch cutting,grazing,tree and shrub removal,losses of litter,and human and animal *** areas had increased soil erosion and often loss of the ‘A' *** close to villages had younger trees,lower stand basal areas,smaller basal area increments,and more *** results suggest an increasingly vulnerable interface between occupants of these two villages and their surrounding forests.

关键词：中国西南地区人类影响森林资源云南松生产力树木生长支架压力

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