贵州楠杆自然保护区楠木种群结构特征

楠木是贵州楠杆自然保护区最重要的优先保护树种之一。采用典型样地调查与样线调查相结合的方法,分析种群结构特征。研究表明,按行政区统计,自然保护区内楠木资源数量依次为楠杆乡(378株,53.62%)>平原乡(299株,42.41%)>沙溪乡(28株,3.97%);按立木等级统计,自然保护区内分布的楠木古树、大树、中树、小树、幼树分别占区内楠木总数量的9.50%、22.84%、34.89%、26.67%、6.10%,种群整体上呈衰退型;自然保护区内共有楠木古树群落12个(楠杆乡5个、平原乡4个、沙溪乡3个)。

Population Structure of Phoebe zhennan in Nangan Nature Reserve in Guizhou Province

Phoebe zhennan is one of the most important protected tree species in Nangan Nature Reserve. The characteristics of population structure were analyzed by combining typical sample survey with sample line survey. Research shows that: 1) Phoebe zhennan ancient trees, big trees, middle trees, small trees, and young trees in the territory account for 9.50 %, 22.80 %, 34.90 %, 26.70 %, and 6.10 % of the total number of it in the area. 2) Phoebe zhennan population is mainly distributed in the 200m range around the village, and ancient tree resources are mainly distributed within the 50m range around the village(98.25 %); 3) There are twelve ancient tree communities of Phoebe zhennan in the protected area (5 in Nangan Township, 4 in Pingyuan Township, and 3 in Shaxi Township); 4) The overall Phoebe zhennan population structure of Nangan, Pingyuan, Shaxi and protected areas is inverted pyramid, and the wild population is recession-type; 5) The traditional ecological protection cultural foundation and public protection awareness may be the key to the protection of many ancient tree resources in the protected area.