鼎湖山植被演替过程中椎栗和荷木种群的动态

 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的。本项研究系统地研究了鼎湖山森林植被演替过程各优势种群的动态。本文研究演替顶极建群种椎栗和荷木等阳生性种群的动态，结果表明其生态位宽度在演替过程中由入侵针叶林起逐渐开始增大，至阳生性为优势常绿阔叶树阶段时为最大，此后渐渐下降，但不会下降为零。在其演变过程中，这些阳生性的种群格局由集群分布演变为趋于随机分布；其与早期先锋种马尾松树种的生态位宽度重叠值和种间联结值由高向低转变，而与中生性树种却有较高的生态位重叠值和种间联结值，但这两方面的值在后期有减弱的趋向。这些结果一方面说明该种群的先锋特性，另一方面也说明由于成熟群落的循环更新使群落结构出现不均匀与镶嵌，使这些阳生性先锋种群 在演替的后期仍以一定数量存在。

STUDIES ON DYNAMICS OF CASTANOPSIS CHINENSIS AND SCHIMA SUPERBA POPULATION IN FOREST SUCCESSION OF DINGHUSHAN MOUNTAIN

The processes of forest succession could be expressed by the dynamic characteristics of dominant populations in forest. The dvnamic characteristics of two heliophyte species,Castanopsis chinensis and Schima superba in forest succession in Dinghushan were studied.The main results were as follows:1.The niche breadths of the 2 species increased after their intruding in the needle-leaved forest, and reached the maximum when they became the dominant populations in evergreen broad-leaved forest;and then reduced gr- adually,but did not disappear at the climax stage. 2. In the process of the succession,changes in distribution patterns of the two populations were from clustering to random. 3.During the succession,the association and niche overlap of these two populations with Pinus massoniana population decreased; while with some mesophyte populations,increased at first and reached at the highest in the evergreen broad-leaved forest stage,then reduced at the late stage. The results suggested that the features of the two populations were that of pioneer species; and the cycle and regeneration of mature community co- uld cause the uneven and inlaying in community structure,which is the re- ason for existence of these heliophyte population at the late stage of succes- slon.