浙江仙居俞坑森林群落研究

浙江仙居俞坑森林群落植物种类丰富，优势种不明显，群落中植物种类以常绿阔叶树种为主，落叶阔叶成分也有一定比例。各样地植物种类相似性很低，组成很不一致。群落垂直结构复杂，地上成层明显。群落乔木层物种多样性指数较高，各样地间多样性指数测值变幅较大。样地内的优势种群中常绿阔叶树种的年龄结构呈稳定型或增长型、而落叶树种的年龄结构呈衰退型。乔木层各优势种群的分布格局多呈随机分布或均匀分布。

ON YUKENG FOREST COMMUNITY IN XIANJU OF ZHEJIANG

The Yukeng forest community in Xianju County of Zhejiang Province has abundance of plant species,of which the dominant population is not so clearly classified. In the community. the evergreen broad-leaved trees are the major plants while the deciduous broad-leaved trees take up a definite proportion. The plant species of various plots hardly resemble and their compositions are very different. The community's vertical structure is complicated,and supraterraneous stratification is clearly determined.The shrub layer of the community has rather a high species diversity index,and the diversity index varies greatly from one plot to another.In the plot,the age structure of the evergreen broad-leaved trees of domminant population is stable or increasing whereas the age structure of the deciduous trees is declining. The distribution pattern of dominant population in the shrub layer is random or uniform.