摘要
采用两种群落分类方法——以环境梯度为分类依据的多元回归树(MRT)和多年来广泛应用的双向指示种分析(TWINSPAN),对吕梁山南段森林群落进行了数量分类,同时依据植物群落分类和命名原则,对分类后的各群系进行命名,并用吻合系数比较两种分类结果的吻合程度,分析MRT的优劣势,为以后选择合适的植物群落数量分类方法提供参考。结果表明:(1)MRT将41个森林样方分为4个群系,分别为侧柏(Platycladus orientalis)群系、青榨槭(Acer davidii)群系、辽东栎(Quercus wutaishanica)群系、柿(Diospyros kaki)群系,群系类型与TWINSPAN的分类结果相同;(2)根据群系的样方组成,两种分类结果的吻合度较高,吻合系数达80.5%;(3)与TWINSPAN相比,MRT同时以物种和环境信息为依据,对有过渡性质的样方划分更为可靠。因此,单纯从植被分类的角度来看,尽管TWINSPAN的分类结果更客观,但当TWINSPAN分类遇到困难时,如在划分大样地连续样方或具有过渡性质样方时,MRT更有优势。
Aims Multivariate regression tree（MRT） is a new statistical technique for plant community classification.Studies on advantages of MRT were still insufficient.Our objective was to compare the results of MRT with two-way indicator species analysis（TWINSPAN）,which is widely used in recent years,and to provide suggestions for choosing an appropriate classification method.Methods We used both MRT and TWINSPAN to classify the forest communities in the southern part of Lüliang Mountain.The MRT analysis gave a tree with the splits based on additional environmental factors.The degree of consistency between the two classifications are compared through the coherence coefficient.Important findings（1） MRT divided 41 forest quadrats into four formations：the Platycladus orientalis formation,Acer davidii formation,Quercus wutaishanica formation and Diospyros kaki formation.The types of the formations are consistent with the analysis results from TWINSPAN.（2） Based on the quadrats that compromise the formations,these two methodologies provided a relatively high consistency,with the coherence coefficient up to 80.5%.（3） Compared with the TWINSPAN,the MRT can be seen as a form of constrained classification analysis that can relate different aspects of species composition to environmental data,so the clusters defined by the MRT define community types of the ecotone in an objective manner not available in other techniques.Finally,the TWINSPAN is a very effective classification technique in plant ecology research.However,the MRT has advantage over the TWINSPAN in terms of classifying continuous or transitional quadrats.
出处
《植物生态学报》
CAS
CSCD
北大核心
2015年第6期586-592,共7页
Chinese Journal of Plant Ecology
基金
山西省化学优势重点学科建设生态化学子项目(912019)
山西省青年科技研究基金(2013021030-3)
山西师范大学校科学研究基金(ZR1218)
山西师范大学生命学院科学研究基金(SMYKZ-19)
关键词
吻合系数
比较
多元回归树
吕梁山南段
双向指示种分析
coherence coefficient comparison multivariate regression tree southern Lüliang Mountain two-way indicator species analysis
