玉龙雪山南坡高山草甸植物群落类型及其分布格局

Alpine meadow community classification and the vegetation distribution pattern analysis on the southern slope of Mt. Jade Dragon

通过野外调查获取玉龙雪山南坡高山草甸分布区域的植被及环境数据,辅以研究区景观尺度的生境特征指标模拟,应用双向指示种分析法确定了研究区草甸植物群落类型,并结合典范对应分析法(CCA)解释草甸植被分布格局与直接环境因子之间的关系。结果表明,1)研究区草甸植物群落可分成4个群丛:大萼蓝钟花(Gyananthusmacrocalyx)群丛、玉龙嵩草+狭叶委陵菜(Kobresia tunicata+Potentilla stenophylla)群丛、嵩草+川滇雀儿豆(Kobresiaspp.+Chesneyapolystichoides)群丛和云南羊茅(Festuca vierhapperi)群丛;2)CCA分析显示,与植被分布直接相关的光、温、水、肥4类因素中,决定研究区群落分布格局的主要因子是生境温度、土壤有机质和土壤全氮含量。

Based on the field investigation measurement and simulation of habitat characteristic （global solar radiation, soil wetness index and habitat temperature） on the landscape scale, vegetation type on the southern slope of Mt. Jade Dragon were classificated by TWINSPAN classification method, and relation-ship between meadow vegetation and direct environmental factors were explained by CCA ordination meth-od. The results of this study showed that： 1） the alpine meadow vegetation can be divided into four plant associations, Ass. Gyananthus macrocalyx, Ass. Kobresia tunicata 4-Potentilla stenophylla, Ass. Kobresia spp. 4-Chesneya polystichoides, and Ass. Festuca vierhapperi ; 2） habitat temperature as well as soil organic matter content and soil total nitrogen content acted as the key factors determining the alpine meadow community distribution patterns.