广西植物2016，Vol.36Issue(2)：154-161,8.DOI:10.11931/guihaia.gxzw201507024
桂西南喀斯特季节性雨林枯立木的空间格局及生境关联性分析
Spatial distribution and habitat-association of snags in the tropical karst seasonal rainforest of Southwest Guangxi , China
摘要
Abstract
Snag is an important component of forest ecosystems, and studying the spatial distribution of snags abundance and its impacting factors will provide insights of the mechanism of tree death and the succession of community. The ob-jective of this study was to understand how snags would vary with environmental factors, and to infer the underlying mechanisms. Our study was based on data from a 15 hm2 study plot investigation in tropical karst seasonal rain forest, Southwest Guangxi, China. The snags with DBH ( diameter at breast height) larger than 1 cm were classified. And the spatial distribution of snags abundance and its impact factors like spatial and topographic variables were analyzed using point pattern analysis with K2( r)-index and habitat associations analysis with Torus-translation tests. Snags were mostly randomly distributed in the plot, but aggregated at local scales of 0-5 m for small group. Snags and the small group were significantly positively with ACH ( altitude above channel) and abundance, but negatively the mean DBH and maximum DBH of each 20 m×20 m quadrat. The large group was only significantly negatively with convexity, while the middle group was no significant correlation with any environmental factors. Density of snags had no habitat association with three habitat types, but the density of larger groups was different significantly associated with three habitat types. The spatial patterns of snags of karst tropical seasonal rainforest had spatio-temporal discrepancy. Snags were randomly distributed in the mass. The spatial patterns of snags might be formed by density dependence at local scales, but habitat filter and in-trinsic aging at larger scales.关键词
空间点格局/相关性/环境因子/枯立木/喀斯特季节性雨林Key words
spatial distribution pattern/correlation/environmental factors/snags/karst seasonal rainforest分类
农业科技引用本文复制引用
郭屹立,王斌,向悟生,丁涛,陆树华,黄甫昭,文淑均,李冬兴,李先琨..桂西南喀斯特季节性雨林枯立木的空间格局及生境关联性分析[J].广西植物,2016,36(2):154-161,8.基金项目
国家自然科学基金(31500342) （31500342）
广西自然科学基金(2015GXNSFBA139050) （2015GXNSFBA139050）
中国科学院"西部之光"项目(人字(2014)91 号) [Supported by the National Natural Science Foundation of China (31500342) （人字(2014）
the Natural Science Foundation of Guangxi (2015GXNSFBA139050) （2015GXNSFBA139050）
"Western Light" Project of the Chinese Academy of Sciences ((2014)91)]. （(2014）
