浙江龙王山银缕梅种群结构和分布格局研究

银缕梅为我国特有珍稀树种，属于国家I级保护植物。本文采用相邻格子样方法和典型样地法研究浙江龙王山自然保护区银缕梅的种群结构和分布格局。结果表明：龙王山银缕梅种群规模偏小，但是其萌生特性明显；其种群共有6个龄级，但幼苗、幼树较少，中龄级的个体偏多，种群更新能力弱，种群结构总体上呈现衰退趋势。在龙王山3个地点的银缕梅种群主要呈集群分布，这与它们生长的生境、繁殖方式密切相关。此外，对该种的生态保护提出了具体建议。

Population Structure and Distribution Pattern of Parrotia subaequalis from Longwangshan Nature Reserve,Zhejiang Province

Parrotia subaequalis,endemic to China,is a rare tree species and is ranked as one of I-class endangered species under the legal protection of country.By applying the contiguous grid quadrats and typical plots,the population structure and population pattern of P.subaequalis from Longwangshan Nature Reserve,Zhejiang Province were studied.The results showed that its population size was relatively small,but the characteristics of sprouting were notable in the wild.There were six age classes in different populations of P.subaequalis,which had fewer seedlings and young trees,and more middle-aged individuals,compared with its mature individuals.Its population had weak ability to regenerate,and was generally of a declining type in terms of population structure.Within all the three sites in Longwangshan,the populations were generally of contagious distribution type,and this could be closely correlated to the growing habitats and reproductive mode of P.subaequalis.Additionally,some suggestions concerning ecological protection of this species were put forward.