【摘要】 本文研究了四川金佛山银杉混交林的分布现状、林学特性、种群动态和残遗性状,试图把群落学与林学的研究结合起来,为保护和发展这一古老珍贵树种提供科学理论依据。更多还原

【Abstract】 The famous "living fossil"--Cathaya argyrophylla was distributed at high norther nlatitudes during the Tertiary time, but now exists only loccally in a very restricted range in the south, region of China. The Cathaya forest of Jinfushan is in fair preservation and has more abundance than others, where we made investigation in 1978. This paper deals with an approach to the environmental condition, forestry nature, community charactor and dynamics of Cathaya forest in Jinfushan. Being highly intolerant, Cathaya requires drier and exposed sites on the mountain ridge and rocky cliff, but is cannot compete successfully with broad leaved trees under moister sites. From sampling at a number of points within community, the relative frequency, relative density and relative dominance of each tree species were determined, the results show the importance values: Cathaya argyrophylla 120.55; Fagus lucida 80.54; Cyclobalanopsis glauca 37.74; Acanthopanax evodiaefolius 37.01; llex franchetiana 24.16. Base on the measurements of community similarity coefficient the Cathaya mixed forest is more similar to evergreen broad leaved forest in surrounding neighbors than Cathaya mixed forests in the other areas, through analysis of the population dynamics the regeneration of seedlings of Cathaya are very few at understory condition, in the cause of time, the Cathaya mixed forest will gradually change to forest dominated by some more tolerant broad leaved trees. Finally, some problems of relic character of Cathaya are discussed as follow: 1. two refuges; 2. the relic nature of dominant species; 3. the similarity of each other in habitat; 4. the hereditary character less adapted with present environment; 5. the low breeding potential and endangered state. Because of souch relic species will eventually perish through competition between species, therefore, it is necessary to do a better job in the protection. As same time, in order to change this weakened natural condition the positive action is needed to promote growth of regenerative seedlings as wall as strength management of young trees and scientific research of breeding.更多还原