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广西石山人工林灌草多样性与环境因子的关系

黄小荣**,何峰,庞世龙,侯远瑞,陆国导   

  1. (广西林业科学研究院, 南宁 530002)
  • 出版日期:2015-11-10 发布日期:2015-11-10

Understory biodiversity of plantations on karst mountains in Guangxi and its relation to environmental factors.

HUANG Xiao-rong**, HE Feng, PANG Shi-long, HOU Yuan-rui, LU Guo-dao   

  1. (Guangxi Academy of Forestry, Nanning 530002, China)
  • Online:2015-11-10 Published:2015-11-10

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。
 

关键词: 毛竹林, 碳库, 氮库, 集约经营, 土壤酶

Abstract: 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 terraces. However, many harmful species flourishing in compulsively conserved karst mountains in Guangxi were absent in the plantations.

Key words: carbon pool, intensive management, nitrogen pool, Moso bamboo forest, soil enzyme