井冈山福建柏种群结构与分布格局的研究

POPULATION STRUCTURE AND DISTRIBUTION PATTERN OF FOLIENIA HODGINSII IN JINGGANGSHAN

采用样地调查法,对井冈山福建柏的种群结构和分布格局进行了研究。结果表明:井冈山福建柏种群Ⅰ级幼苗数最多,占样地内福建柏个体数的55.00%,III级中龄树和V级老龄树个体数最少,均占样地内福建柏个体数的6.67%,种群结构为金字塔型,属于增长型种群。福建柏种群生命期望值先随径级增加而增加,然后又随径级的增加而递减,Ⅲ级中龄树的死亡率为负值。福建柏种群的存活曲线为近直线型,生长较为稳定。福建柏种群的分布格局呈集群分布。福建柏的种群特征主要由福建柏本身的生物学特性、所处群落的环境条件和群落结构所决定。

The population structure and distribution pattern of Fokienia hodginsii population in Jinggangshan were studied by quadrat method.The results show that the number of seedling in Ⅰ grade is the most,accounted for 55.00% of total,the number of middle-age trees in III grade and old trees in V grade are the least,and accounted for 6.67% of total respectively.The population structure of F.hodginsii in Jinggangshan was of Pyrimid type,indicating that it is growing population.Based on the analysis of static life table,with increasing of diameter class,the life expectancy of the population increases step by step firstly,and then decline step by step,and the middle-age trees in Ⅲ grade has negative mortality.The survival curve of F.hodginsii population in Jinggangshan was approximately linear,indicating its growth is relative stability.F.hodginsii population presented a clumping distribution.The population characteristics of F.hodginsii were decided by its biological characteristics,community environmental factors and community structure.