陕南秦巴山区黏菌的物种组成和分布格局

Species composition and distribution pattern of myxomycetes in Qinba mountainous area of southern Shaanxi Province

为揭示陕西省南部秦巴山区腹地黏菌物种多样性与分布特征,对陕南地区的42个地点开展了黏菌资源调查,共获得1021份标本,根据形态特征鉴定为5目9科26属119种。分析黏菌物种组成与多样性指数表明,陕南地区的优势种为蛇形半网菌Hemitrichia serpula,相对多度为6.37%,该地具有较高黏菌物种多样性(H’=6.24),同时秦岭黏菌物种多样性指数(H’=6.19)高于大巴山(H’=5.28)。黏菌物种多样性在不同植被类型下差异显著,针阔叶混交林最高,针叶林最低,群落分布相似性较低,表明植被类型的变化会影响该地区黏菌的物种组成。

To reveal the diversity and distribution characteristics of myxomycetes in Qinba mountainous area of southern Shaanxi Province,1021 specimens were collected from 42 sites in the area.Based on morphological characteristics,119 species in 26 genera of 9 families belonging to 5 orders were identified.The dominant species was Hemitrichia serpula with relative abundance of 6.37%.There was a high diversity of myxomycetes in this area(H’=6.24).The species diversity index(H’=6.19)in Qinling Mountains was higher than that in Daba Mountains(H’=5.28).The species diversity of myxomycetes was significantly different with the difference of vegetation types.The diversity was the highest in mixed broadleaf-conifer forest and that in coniferous forest was the lowest.The similarity of community distribution in different forest type was low,indicating that vegetation types significantly affected the species composition of myxomycetes in this area.