摘要
首次在 DCCA排序的基础上使用排序轴分类法 ( OAC) ,将其发展为一个新的典范分类方法 ,并应用这种方法对山西关帝山八水沟的植物群落进行了数量分类 ,共划分出 5类 ,效果较好。方差分析与多重比较表明 ,环境与群落结构因子在不同群落之间存在较为显著的差异 ,表明 DCCA排序轴分类法能较好地反映群落与环境的变异。因为 DCCA排序轴分类同时结合了植被因子与环境因子 ,所以它能较好地表达植物群落的环境梯度和结构梯度 ,反映环境与结构的空间变异特点。第 1排序轴表达了朝向暖干方向的梯度 ,植物群落类型由森林向灌丛过渡 ,森林群落由杨桦 -云杉混交林和华北落叶松 -白混交林向山杨 -辽东栎混交林过渡 ,主要反映小地形方面的水平变异与木本植物群落类型变异的综合梯度 ,变异尺度较小 ;第 2轴表达了朝向冷湿方向的梯度 ,植物群落类型由森林和灌丛向草甸过渡 ,森林群落由杨桦 -云杉混交林和山杨 -辽东栎混交林向华北落叶松 -白混交林过渡 ,主要反映海拔方面的垂直变异与植物群落类型变异的综合梯度 ,变异尺度相对较大。两者综合作用表达了该地区植物群落的空间生态梯度。DCCA排序轴分类具有 DCCA的优点 ,不仅能除去弓形效应 ,而且能同时结合多个环境因子 ;不仅能独立完成分类过程 ,而且其生态意义明确。
Based on Detrended Canonical Correspondence Analysis(DCCA),a new classification method,DCCA Ordination Axes Clustering(OAC)was introduced and was applied to the classification of the plant communities in Bashuigou catchment,Guandi Mountain,Shanxi Province.Five types of communities can be identified with the method.It is concluded that there are obvious differences of community structure and environmental factors among the community types by using the Analysis of Variance and Multiple Comparison.So,the OAC based on DCCA expresses the ecological gradients of communities and environment clearly. For the OAC based on DCCA combining the vegetation and environmental factors,it expresses the gradients and the variation characteristics of the community structure and environment well.The axis 1 illustrates the gradients towards warm and dry,representing the horizontal variation of micro topography and the types of wooden plant community.Along the axis 1,the shrub community replaces the forest community,and the Populus spp.+ Betula spp. Picea spp.forest and the Larix principis rupprechtii Picea meyeri forest are replaced by the Populus davidiana Quercus liaotougensis forest.However the scale of variation is small.The axis 2 means the gradients towards cold and wet,caused by the vertical variation of altitude and the types of plant community.Along the axis 2.the herbaceous community replaces the forest and shrub community,and the Populus spp.+ Betula spp. Picea spp.forest and the Populus davidiana Quercus liaotungensis forest are replaced by the Larix principis rupprechitii Picea meyeri forest.However,the scale of variation is large.At all,the two dimensional plot of the axis 1 and axis 2 can clearly reflects the spatial gradients of communities in this area. The OAC based on DCCA is good as DCCA,and it can remove Arch effect and relate more environmental factors.Also,it is good as OAC,and its can finish clustering by itself,and it means definite ecological relations.This new method has some advantages in the study on the relationships between the community and environment.
出处
《生态学报》
CAS
CSCD
北大核心
2000年第2期199-206,共8页
Acta Ecologica Sinica
基金
国家教委基金
山西省留学基金和山西省自然科学基金
关键词
关帝山
八水沟
植物群落
CDDA排序
OAC
生态梯度
plant community
Detrended Canonical Correspondence Analysis(DCCA)
Ordination Axes Clustering(OAC)
ecological gradients
