乳源木莲天然林优势种群结构与空间格局

在福建沙县乳源木莲天然林群落内 ,设置样地并应用相邻格子法进行每木调查 .通过对优势种种群结构和空间格局的研究 ,结果表明 :乳源木莲种群结构稳定 ,为成熟型种群 ;拉氏栲、酸枣种群结构呈倒金字塔型 ,幼苗缺乏 ,但大树最多 ,分别达 59和 38株· hm-2 ;栲树种群结构呈金字塔型 ,具有丰富的幼苗贮备 ,达 69株·hm-2 .群落中乳源木莲、拉氏栲种群分布格局均为聚集分布 ,但乳源木莲聚集强度较大 ;酸枣种群呈随机分布 ,栲树种群呈均匀分布 ,这主要与物种本身的生态和生物学特性有关 ,亦与物种间的竞争排斥作用有密切联系

Structure and Spatial Pattern Dynamics of Dominant Populations in a Natural Forest of Manglietia.yuyuanensis Law Community

Plots were set up in a natural forest of M yuyuanensis Law in Shaxian county, Fujian province and field data were obtained by using contiguous grid quadrat method The study on population structure and spatial distribution patterns of the dominant species shows that M yuyuanensis Law had a stable structure and belonged to a mature type of population structure The population structure of Castanopsis Lamontii and Choerospondias axillaries were all inverse pyramid types,with no seedlings, but the amount of large trees were more most, add up to 59 and 38 saplings per·hm\+2 Castanopsis fargesis had a large reserve of seedlings, amount to 69 seedlings per·hm\+2 , showing a pyramid shape of population structure The spatial distribution patterns of M yuyuanensis Law and Castanopsis Lamontii in community were all aggregated ,but the aggregation intensity of M yuyuanensis Law was larger Choerospondias axillaries showed an random distribution pattern and Castanopsis fargesis showed an uniform one