干扰对天然红松林植物多样性的影响

PLANT DIVERSITY OF PINUS KORAIENSIS FORESTS UNDER DISTURBANCE IN CHANGBAI MOUNTAINS OF CHINA

对长白山林区受不同程度干扰（择伐）的红松林与红松林被皆伐后形成白桦次生林的植物多样性进行了研究，结果表明，白桦群落及其下木层的多样性高于各类型的红松林。不同类型的红松林中，以轻度干扰的红松原始群落及其立木层和草本层的多样性最大，这是群落长期演容、物种适应的结果。白哗群落处于演替的第二阶段，群落中侵入了较多的耐荫树种，加之林内光照条件好，故而有发达的下木层，致使树种的多样性很高。本文还分析了多样性与均匀度及生境条件的关系。

A comparison was made on the plant divenity of Pinus. koraiensis forest after selective cutting and Betula platyplla secondary forest formed after clear cutting in the .P.koraiensis forests in Changbai Mountain forest region in China. The results show that the divenity of the whole community and undergrowth of B. platyphyllasecondary forest are. higher than that of any type of P koraiensis. forests. The divenity of the whole community and tree layer of P korairensis. virgin forest with slight-. selective cutting are the highest among all P koraiensis. forests, which is the result of the forest adapting long term succession and species adaptation. Because B platyphylla forest is in the second succession stage, more shade- tolerant tne species had colonized the community. Besides, solar radiation is the B platyphylla forest is better so that the undergrowth developed well, and the diversity of woody plant is very high. At last. the relationships between diversity and evenness, haibtat of. the communities are analysed.