摘要
以广西石山人工林群落调查数据为材料,采用双向指示种分类（TWINSPAN）、冗余分析（RDA）和典范对应分析（CCA）研究了9个生境变量、1林分类型因子与石山人工林多样性、草本和灌木植物组成的关系。结果表明,坡位是影响石山人工林物种组成多样性的最主要因子,露石率和坡度对石山人工林林下有害物种分布影响最大。石山人工林林下植被组成的主要决定因素是生境因子（解释率23%～55%）,而树种选择是次要因素（解释率11%～17%）。石山梯地人工林的有害草本种类多于坡地,梯地的有害灌木种类少于坡地。石山人工林的有害植物种类少于封山育林地。
Plantations of broadleaf species on karst mountains were investigated in Pingguo, Guangxi, to evaluate their understory biodiversity and community composition in relation to 9 habitat variables and 1 stand-type factor by TWINSPAN classification, redundancy analysis （RDA） and canonical correspondence analysis （CCA）. The results showed that slope position of plantations was the main factor dominating understory species composition, while rock exposure and site steepness contributed most to the distribution of harmful species. Effects of habitat factors were higher than that of stand-type factor, and the former explained 23%-55% of variance in species composition, while stand type approximated 11%-17% of the variance. There were more harmful herb species on terraces than on slope lands, but fewer harmful shrub species on ter- races. However, many harmful species flourishing in compulsively conserved karst mountains in Guangxi were absent in the plantations.
出处
《生态学杂志》
CAS
CSCD
北大核心
2015年第11期3024-3033,共10页
Chinese Journal of Ecology
基金
广西科技厅项目(桂科攻14124004-3-11)
广西林业科技项目(桂林科字2014-02
桂林科字2012-3)资助
关键词
多样性
有害植物
哑变量
预选
膨胀因子
双序投影
biodiversity
harmful plant
dummy variable
forward selection
inflation factor
biplot projection
作者简介
通讯作者：黄小荣，女，1964年生，硕士研究生，主要从事森林生态、数量生态学研究。E-mail：huangxr2004@sina．com
