大小兴安岭过渡区木本植物群落数量分类与排序

为了科学利用和有效保护植被资源、改善区域生态环境,在群落样方调查基础上,采用双向指示种分析法(TWINSPAN)和典范对应分析(CCA)对大小兴安岭过渡区木本植物群落进行了数量分类和排序。TWINS-PAN分类对大小兴安岭过渡区33个样地划分为7个群落类型:红松—红皮云杉针叶混交群落;落叶松—白桦群落;白桦群落;蒙古栎—山杨群落;水曲柳群落;樟子松—兴安落叶松群落;樟子松群落。33个样方的CCA排序结果反映了植物群落类型与环境梯度之间的关系,表明海拔和土壤状况是影响物种分布分异的最主要环境因子,郁闭度对物种分布分异起次要作用。物种样地与环境因子CCA排序结果是:第一轴与海拔、土壤全氮存在极显著关系,与土壤有机质含量、湿度和群落郁闭度指数存在着较显著的相关关系;第二轴与土壤全磷有显著的相关关系;第三轴则主要反映了土壤含水率的变化。

Numerical Classification and Ordination of Woody Plants in Ecotone of Daxing'an Mountains and Xiaoxing'an Mountains

An experiment was conducted to study the classification and ordination of plant communities in the Ecotone between Daxing'an Mountains and Xiaoxing'an Mountains using Two-way Indicator Species Analysis(TWINSPAN)and Canonical Correspondence Analysis(CCA)aiming to utilize and protect the plant resources scientifically and reasonably.Thirty-three sample plots are divided into 7 groups by TWINSPAN,namely,Pinus koraiensis-Picea koraiensis community,Larix gmelinii-Betula platyphylla community,Betula platyphylla community,Quercus mongolica-Populus davidiana community,Fraxinus mandshurica community,Pinus sylvestris var.monolica-Larix gmelinii community,and Pinus sylvestris var.mongolica community.The ordination result by CCA reflects the relationship between community type and environmental gradient.Altitude and soil are the two most important factors and canopy density is the secondary factor on the community distribution.Extremely significant correlations between the first CCA axis and altitude,soil total N as well as relatively significant correlations between the first CCA axis and organic matter content,soil moisture,and canopy density were found.There is an obvious relationship between the second axis and soil total P,and the third axis reflects the change of soil water content.