后河保护区柳杉林中黏菌群落组成

柳杉是中国特有树种,对于广泛分布于森林生态系统的黏菌而言,单纯的柳杉林是一种特殊的生境。为探索柳杉林中黏菌的物种多样性,本研究在武陵山区东北部的湖北省后河国家级自然保护区柳杉林样地中采集柳杉树皮和凋落物,在120个培养湿室中,发生黏菌的湿室68个,占56.67%。从两种基物上获得黏菌6目7科12属24种,优势种为混淆筛菌Cribraria confusa,相对丰度达到19.01%。柳杉林凋落物上发生的黏菌种类和数量高于柳杉树皮,凋落物和柳杉树皮上发生的黏菌共有种为4种,种群间的Sørensen相似性系数为Cs=0.333。在不同季节间,黏菌物种的群落组成与多样性也表现出差异,春季Shannon-Wiener多样性指数Hʹ=0.2987±0.1564,夏季Hʹ=0.1105±0.0949,秋季Hʹ=0.1968±0.0589,冬季Hʹ=0.2726±0.0875。黏菌物种数量发生最多的是春季和冬季,均有15种,仅在春季发生的黏菌物种为粗壮发菌Comatricha suksdorfii、鲜黄绒泡菌Physarum luteolum、暗红团网菌Arcyria denudata和极小无丝菌Licea minima,仅在冬季发生的黏菌物种为钙丝绒泡菌Physarum decipiens、小筛菌Cribraria microcarpa和暗褐无丝菌Licea belmontiana。典型对应分析（canonical correspondence analyses,CCA）表明,影响柳杉林中黏菌物种群落组成与多样性的主要环境因素是基物类型。

The community of myxomycetes in Cryptomeria fortunei forest of Houhe National Nature Reserve,Hubei Province,China

Cryptomeria fortunei is an endemic tree species in China. Pure C. fortunei forest is a special habitat for myxomycetes which are widely distributed in forest ecosystem. In order to explore the species diversity of myxomycetes in C. fortunei forest, the bark and litter of C. fortunei were collected in Houhe National Nature Reserve of Hubei Province in the northeast of Wuling mountainous area. Among the 120 moist chamber cultures, 68 cultures were colonized by myxomycetes, accounting for 56.67% of the total. A total of 24 myxomycete species was obtained, belonging to 6 orders, 7 families and 12 genera. The dominant species was Cribraria confusa, with relative abundance of 19.01%. The number of species occurred on the litter were more than that on the bark. Litter and bark have 4 species in common. Sørensen similarity coefficient between populations was Cs=0.333. In different seasons, the community composition and diversity of myxomycete species showed differences, Hʹ=0.2987±0.1564 in spring, Hʹ=0.1105± 0.0949 in summer, Hʹ=0.1968±0.0589 in autumn, Hʹ=0.2726±0.0875 in winter. The largest number of myxomycete species occurred in spring and winter, being equally 15 species. The species only occurred in spring were Comatricha suksdorfii, Physarum luteolum, Arcyria denudata, and Licea minima. The species only occurred in winter were Physarum decipiens, Cribraria microcarpa and Licea belmontiana. Canonical correspondence analyses (CCA) showed that the main environmental factor that affected the community composition and diversity of the myxomycetes in C. fortunei forest was the type of substrate.