关键词: 长苞铁杉, 种群增长, 优势度, 遗传算法

Abstract:

Tsuga lorgibracteata is one of the rare gymnosperms and endemic to China. With the changes in environment and ecosystems, the total number of individuals has decreased rapidly and it is considered an endangered plant on the brink of extinction. This paper dealt with the growth dynamics of dominance of rare and endangered Tsuga lorgibracteata population based on the growth models, which were four limited space growth models for population. Compared with the fitting results of four models, the best growth model was selected to express the growth dynamics of dominance for Tsuga lorgibracteata population, which was s=exp(-0.046 804ln²(1+108.386 5 e^{-0.594 42}t)-0.87371 ln(1+108.3865 e^-0.59442t)+3.655 44). Then the environmental capacity of dominance of \%Tsuga lorgibracteata\% population was calculated. It was 38.6847m²·hm^-2. And the simulated result of dominance showed that when the diameter at breast height was about 40cm, the population growth of dominance would be highest, which would provide a theoretical basis for the protection and management of Tsuga lorgibracteata.

Key words: Tsuga lorgibracteata, Growth dynamics, Dominance, Genetic Algorithms