宁武废弃煤矿矸石山自然定居植物群落数量分类与排序

Classification and Ordination of the Naturally Colonized Plant Communities in Coal Gob Piles of Abandoned Mine in Ningwu County,Shanxi

应用双向指示种分析法(TWINSPAN)和除趋势对应分析法(DCA),对山西宁武县废弃煤矿矸石山自然定居植物群落生态关系进行研究,将该矸石山植物群落划分为7个群丛,其中5个群丛位于阳坡,分别以铁杆蒿、披碱草、小红菊、黄香草木樨等旱生植物为优势种;2个群丛位于阴坡,分别以老鹳草、苦荬菜、节节草等中生植物为优势种。样方和优势种的DCA排序结果表明,影响研究区矸石山自然定居群落物种分布的主要因素是土壤水分条件和坡向,其是对植物种的分布起关键作用的环境因子,群丛的分布与优势种的分布关系密切。

Based on the two- way indicator species analysis（TWINSPAN）and detrptended correspondence analysis（DCA）, the naturally colonized plant communities in coal gob piles of abandoned mine in Ningwu county, Shanxi province were classified into seven plant associations. Among of them, five associations were distributed in sunny slope dominated by xerophytic species of Artemisia sacrorum, Elymus dahuricus, Dendranthema chanetii, Melilotusofficinalis, respectively; two associations were distributed in shady slope dominated by mesophyte species of Geranium wilfordii, Commelina diffusa, Ixeris polycephala, respectively. The DCA ordination of samples and dominant species showed that soil water condition and slope were the main factors influence the distributions of natural colonized plant species and their communities in the study area, and the distributions of seven plant associations had close relationship with the dominant species.