广西科学Issue(5)：469-476,8.
不同更新方式巨尾桉林下植物群落变化及其环境解释
Changes in Understory Plant Community of Eucalytus grandis ×E.urophylla Plantation in Different Regener-ation Modes and Associated Environmental Explanations
摘要
Abstract
[Objective]The aim of this paper was to better understand the change regulation of understory plant communities of Eucalytus grandis × E.urophylla plantation in different re-generation modes.[Methods]The relationship between the distribution of understory plant and environmental factors were quantitatively assessed by the method of canonical correspondence analysis (CCA ).[Results]Five years after the regeneration,the species richness of herb layer and shrub layer of the community ranged as planting forest> sprout forest> cut-over land. The highest of Shannon-Wiener index,Simpson index and Pielou evenness index of the herb layer was obtained in planting forest,the second in cut-over land,and the smallest in sprout forest. The Shannon-Wiener index,Simpson index and Pielou evenness index of shrub layer was the highest in sprout forest,moderate in the planting forest,and minimum in cut-over land.Variance analysis results show that there were significant differences between the herb layer of sprout forest and planting forest on Shannon-Wiener in-dex,Simpson index and Pielou evenness index (P <0.05).Shannon-Wiener index and Pielou evenness index of cut-over land were significantly lower than that of sprout forest (P<0.05), and there were no significant differences between the other parts.The composition of plant spe-cies was significant differences in three communities.Canopy light-transmittance coefficient, soil porosity,slope direction and soil available phosphorus were important influences on species distribution pattern in shrub layer.Superposition effects of 4 environmental factors explained 90% of variation of 3 kinds of communities of shrub layer species composition.Canopy light-transmittance coefficient,slope direction,total nitrogen/total phosphorus,available nitrogen/a-vailable phosphorus and soil porosity were important influences on herb layer species distribu-tion patter.Superposition effects of 5 environmental factors explained the 86% of variation of herb layer species composition between 3 communities in total.[Conclusion]Microhabitat chan-ges led to the changes in understory plant species composition of Eucalytus grandis × E. urophylla plantation in different regeneration modes.Moderate disturbances (non-controlled burning,non-herbicide,strip soil preparation and banded tending)were conducive to the main-tenance of understory plant diversity.关键词
典范对应分析(CCA)/更新方式/植物多样性/群落组成/环境因子/桉树Key words
canonical correspondence analysis (CCA)/regeneration mode/plant diversity/com-munity composition/environmental factors/eucalyptus分类
生物科学引用本文复制引用
朱宏光,熊江波,尤业民,兰保国,温远光,杨瑶青,刘正富,杨建基..不同更新方式巨尾桉林下植物群落变化及其环境解释[J].广西科学,2014,(5):469-476,8.基金项目
国家自然科学基金项目(31460121),国家科技支撑计划项目(2012BAD22B01),广西重大专项计划项目(1222005)和广西教育厅重大项目资助。 （31460121）
