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作 者 ：赵学农

期 刊 ：植物生态学报 1991年 15卷 2期 页码：183-190

关键词：种群自疏；种间竞争；重要值百分数；木果石；

Keywords:Population self-thinning, Interspecific competition, Percentage of important value, Lithocarpus xylo,

摘 要 ：本文研究了哀牢山徐家坝地区优势种群木果石栎的自我调节，其自疏指数为 –2.8208。采用重要值百分数求取竞争系数，以优势种群在正常纯林中的优势度作为其容纳量，并用Lotka—Volterra竞争方程讨论木果石栎群落的优势种群木果石栎、景东石栎、腾冲栲的竞争，结果表明平衡时，相对优势度分别为29.52%、39.90%、30.58%。即木果石栎群落将由木果石栎，景东石栎，腾冲栲三种植物共优组成。

Abstract:

This paper focuses on the self-regulation of Lithocarpus xylocarpus population, which is one of main dominant species of the mountainous humid evergreen broad-leaf forest in Xujiaba region, Ailao Mountain stituated in the mid-south of Yunnan province (24˚31′–24˚35′N,101˚00′– 101˚03′E). It has been found that the relationship between the population density (D) and the mean plant biomass (B) during the self-thinning can be described as:

B= 1825267.081D-2.8208 (l10≤D≤1051)

where B is in t/stem, D is in stems/ha.

The percentages of importance value of Lithocarpus xylocarpus, Lithocarpus chintungensis and Castanopsis wattii have been regarded as the measure of the niche overlap, which results in a new method to calculate competition coefficient, the final result of competition has been discussed with the Lotka-Volterre equation of competition. The analysis showed that the relative dominance of L. xylocarpus, L. chintungensis and C. wattii are respectively 29.52%, 39.90% and 30.58%. Hence three species can jointly dominate a community.

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