浙江省江郎山丹霞地貌岩生植被群落特征

经调查，江郎山丹霞地貌岩生植被包括苔藓群落、景天群落、山类芦群落、苦苣苔群落、蕨类群落及木本植物群落等6种，涉及71科136属193种高等植物，其优势科有毛茛科Ranunculaceae，景天科Crassulaceae，蔷薇科Rosaceae，豆科Leguminosae和苦苣苔科Gesneriaceae等。群落上层几乎无高大乔木覆盖；灌木、藤木植物虽有一定数量的分布，但丰富度及频度相对较小；草本植物优势明显，涉及100多个物种，圆叶景天Sedum makinoi，山类芦Neyraudia montana，珠芽景天Sedum bulbiferum，江南卷柏Selaginella moellendorffi及苦苣苔Conandron ramondioides等为群落重要的广布种；苔藓层植物种类相对较少，在该岩生环境中优势尚不明显，但覆盖度较大，且多覆盖于裸岩石壁之上，其中以毛尖卷柏藓Racopilum aristatum，曲柄藓Campylopus flexuosus和扭叶藓Trachypus bicolor等为优势种。江郎山岩生植被能在灼热干旱、土壤贫瘠、石质性强的裸岩环境中生长繁育，对保护和塑造其奇特的丹霞地貌发挥着重要作用。表4参25

Community features of rock vegetation of Danxia topography in Mount Jianglangshan,Zhejiang Province

There are 6 types of rock vegetation of Danxia topography in Mt.Jianglangshan,namely,moss community,sedum community,Neyraudia montana community,Gesneriaceae community,fern community and woody plant community,relating 71 families,136 genera and 193 species.The dominant families are Ranunculaceae,Crassulaceae,Rosaceae,Leguminosae and Gesneriaceae.There are hardly tall arbors in the upper layer of the community.Although a certain amount of shrub and vine distribute therein,they have relatively low richness and density.The herbs have a striking advantage,relating over 100 species.Species such as Sedum makinoi,Neyraudia montana,Sedum bulbiferum,Selaginella moellendorffiand Conandron ramondioides are so important and widely dispersed species in the community.Moss layer has a comparatively small number of plant species.Its advantage in the saxicolous environment is not yet clear,but has a larger coverage,mostly covering the bare rock cliff.Species such as Racopilum aristatum,Campylopus flexuosus,Trachypus bicolor are dominant.Rock vegetation of Mt.Jianglangshan could grow and breed in the bare rock which is arid,barren and stony,and also plays an important role in protecting and shaping the peculiar Danxia topography.