山桂花人工纯林与混交林群落学特征比较

通过样地法比较了山桂花的山地人工纯林及山桂花+西南桦混交林群落的生活型谱、叶型谱、植物种类的重要值以及物种多样性等特征,结果发现:山桂花纯林和山桂花混交林都以高位芽植物为主,其次为地面芽植物;在高位芽植物中又都以小高位芽植物的比例为高;山桂花纯林的中、矮高位芽植物比例比混交林高,而混交林的大高位芽植物、藤本高位芽植物比例比纯林高 山桂花纯林和混交林的叶级都以中型叶为主,大型叶次之,2种森林类型各叶级的比例分配基本一致,但两者叶级谱还是略有差异,2种林型的生活型特征符合热带植被的群落学特征 山桂花纯林的物种丰富度要比山桂花+西南桦混交林高,山桂花纯林和山桂花+西南桦混交林的Shannon Wiener指数(H′)值相差不大,而混交林的均匀度要比纯林高 根据群落中各植物重要值的大小,纯林的物种组成主要有:山桂花、鸡血树、黄毛榕、棕叶芦、山菅兰、竹叶草等;混交林的植物种有:山桂花、西南桦、苦竹、短刺栲、西南凤尾蕨、山菅兰、棕叶芦等 纯林和混交林群落层次都分为3层,其中纯林的乔木层树种单一,灌木和幼树层种类较多,多达71个植物种,占总种数的51 82%;而混交林的灌木和幼树层有44种,占总种数的32 12%

The Comparison of Community Characteristics Between Artificial Pure Forest of Paramichelia baillonii and Mixed Forest of Paramichelia baillonii and Betula alnoides

The life form spectrum, leaf size spectrum, the important values of plant species and species diversity of artificial pure forest of Paramichelia baillonii and mixed forest of Paramichelia baillonii and Betula alnoides in southern Asian tropical mountain were studied by use of plot method (quadrat investigation method). The results showed that Phanerophytes were the dominant life form in the spectrum the mixed forest. The percentage of Miphanerophytes was the highest in the Phanerophytes. The pure forest had higher percentage of Mesophanerophytes and Naphanerophytes than the mixed forest, otherwise the mixed forest had higher percentage of Megaphanerophytes and liano than the pure forest. The dominant leaf size of the two kinds of forests was Mesophyll and the second was Macrophyll in their leaf size spectrum. Their life form spectrum were alike.The pure forest had higher species richness than the mixed forest. But the mixed forest had higher pielou indices than the pure forest. The two kinds of forests had the similar Shannon-Wiener indices values(H′). According to the important values of plant species, the main species composition of pure forest of Paramichelia baillonii were Paramichelia baillonii, Milletia leptobotrya, Ficus fulva, Thysanolaena maxima, Dianella ensifolia, Oplismenus compositus and Carex baecan etc. The main species composition of mixed forest of Paramichelia baillonii and Betula alnoides were Paramichelia baillonii, Betula alnoides, Pleioblastus amarus, Castanopsis echidnocarpa, Dianella ensifolia and Thysanolaena maxima etc.