大树杜鹃种群空间分布及生命表分析  

Spatial distribution and life table analysis of Rhododendron protistum population

作　　者：李贵祥[1] 柴勇[1] 邵金平[1] 王元忠[2] 和丽萍[1] 方波[1] 

机构地区：[1]云南省林业科学院,云南昆明650201 [2]云南省农业科学院药用植物研究所,云南昆明650200

出　　处：《森林与环境学报》2016年第3期332-336,共5页Journal of Forest and Environment

基　　金：国家林业公益性行业科研专项"高黎贡山主要珍稀濒危树种近地保护技术研究"(201304306)

摘　　要：对云南省主要的大树杜鹃分布区域腾冲县进行调查分析,大树杜鹃空间格局采用方差/平均数比率检验,其值为1.27,属成群分布,其种群结构特征为:从大树杜鹃幼树、中树、大树分布趋势和种群年龄结构图来看,大树杜鹃种群呈稳定增长的格局;从静态生命表来看,大树杜鹃种群在第1径级死亡数量最多,第2径级以后死亡率逐渐减少,个别径级由于总的个体数量已不多,死亡数量较少,但死亡率却呈现较高的水平;平均生命期望值(ex)在第7径级(30 cm<DBH≤35 cm)达到最高(5.45),第2-11径级的ex也都在4.00以上,表现出较旺盛的生命力,第1径级及第18径级(85 cm≤DBH<90 cm)以后的ex都在3.00以下,表明这些阶段的大树杜鹃生命力较弱,平均期望生存能力较低;从存活曲线来看,大树杜鹃种群的存活曲线接近于对角线型——Ⅱ型,表示各龄级死亡率大致相同,在幼树阶段(第1径级)的存活数较多,但死亡率也最高(59%),进入中树阶段后,存活数逐渐变少,死亡数保持较低的水平。Investigation and study were conducted in Tengchong County of Yunnan Province,the main distribution area of Rhododendron protistum var. giganteum（ Forr. ex Tagg） Chamberlain,to search the population structure and characteristics of this species. The spatial distribution pattern was tested by the ratio of variance and mean,and the value was 1. 27. The population characteristics were as the following. The population showed the pattern of steady growth evaluating from the distribution tendency of young trees,mid-age trees and mature trees,and from the age structure. The static life table showed that the mortality of the diameter class 1 was the highest,the mortality gradually decreased from the class 2. Among those,there was a certain diameter class with low number of dead tree since the total tree number of the specific diameter class was also quite low,however the mortality was high. The life expectancy of the diameter class 7（ 30 cm〈DBH≤35 cm） was the highest of 5.45,those of the class 2 to class 11 were also higher than 4.00,whereas the life expectancy of class 1 and class 18（ 85 cm ≤ DBH 〈90 cm） were lower than 3. 00,indicating the weak vitality of these stages. The survival curve of R. protistum population belonged to Deevey type Ⅱ which implied the similar death rate of different age classes. At sapling stage,the number of survival trees was the highest,meanwhile with the highest death rate of 0.59,to the stage of mid-age,the number of survival trees gradually decreased,and the number of dead tree was maintained at the a relatively low level.

关 键 词：大树杜鹃 种群特征 高黎贡山 空间分布 生命过程 

分 类 号：S714[农业科学—林学]