鼎湖山植被演替过程优势种群动态研究Ⅲ．黄果厚壳桂和厚壳桂种群

STUDIES ON THE DYNAMIC OF DOMINANT POPULATIONSOF DINGHUSHAN FOREST DURING SUCCESSIONS Ⅲ.CRYPTOCARYA CRYPTOCARYACONCINNA POPULATIONS

摘要:

森林群落的演替过程，是以各优势种群的动态为其表现特征．本项系列研究以系统地揭示鼎湖山森林植被演替过程各优势种群的动态为目的，本文研究了其中演替顶极种黄果厚壳桂和厚壳桂种群的动态．结果表明在演替过程中，其生态位宽度在针阔叶混交林阶段后期逐渐增大，这一趋势将至地带性中生性季风常绿阔叶林阶段．在这类中生性树种的发展过程中，种群的分布格局强度均有在高集群和随机分布之间、围绕低集群分布呈波动的趋势；其与早期先锋树种马尾松种群的生态位重叠值和种间联结值在针阔叶混交林阶段有较低值，至阳生性阔叶树种为优势常绿阔叶林阶段下降为零；而与阳生性树种的生态位重叠值和种间联结值由高向低转变，说明这类种群作为群落顶极种的特性．

Abstract:

The dynamic characteristics of dominant populations can show forest succession process.In this paper, the dynamoic characteristics of two mesophyte populations,Cryptocaryachinensis and Cryptocarya concinna, during succession in Dinghushan were studied.The mainresults were as follows:1. The niche breadths of the two populations increased gradually in the stage of needlebroad-leaved "dxed forest.This trend stopped in the stage of territorial seasonal evergreen broad-leaved forest.2.In the process of succession,the intensities of the distribution patterns fluctuated atlow-- intensitied clumped distribution with their dispersing, developing, self--licitted functionand other ecological factors.3. The coefficients of association and niche overlap between mesophyte populations andPinus massoniana population were relatively low in the stage of needle--broad --leaved "dxedforest,and dropped to zero in the stage when the heliophytes became dominant in the evergreen broad--leaved forest. Two values between mesophyte populations and heliophytepopulations turned from high to low during the whole period.These results showed the feature of mesophyte populations as the climax populations ofthe forest.