深圳羊台山森林公园红鳞蒲桃种内与种间竞争研究

Intraspecific and Interspecific Competition in Syzygium hancei in Yangtai Mountain of Shenzhen

为了解羊台山的红鳞蒲桃群落种内竞争强度和种间竞争强度，使用Hegyi 单木竞争指数模型定量分析。结果表明，红鳞蒲桃的竞争强度呈现双峰特征：种内竞争强度随着植株径级的增大而呈减小趋势，种内竞争显著大于种间竞争；在35～40 cm径级竞争指数再次出现一个峰值。目标树种种内、种间竞争强度的顺序为：红鳞蒲桃＞九节＞鸭脚木＞豺皮樟＞银柴＞山乌桕＞山苍子＞黑柃。竞争木对目标树种的竞争强度与目标树种的胸径服从幂函数关系，竞争强度和目标树种个体的大小呈负相关关系，当红鳞蒲桃胸径达到25 cm后，竞争强度趋于稳定。

The intraspecific and interspecific competition intensity in Syzygium hancei in Yangtai Mountain of Shenzhen City were quantitatively analyzed using Hegyi single tree competition index model.The results showed that the intraspecific competition intensity in S.hancei had bimodal feature.The intraspecific competition intensity decreased gradually with the increase of tree diameter at breast height （DBH）class,and the interspecific competi-tion in S.hancei were more intensive than those in associated tree species;and there was another strong competitive stage in DBH of 35-40 cm.The order of the intraspecific and interspecific competition intensity in S.hancei was：S.hancei 〉Psychotria asiatica 〉Schefflera heptaphylla 〉Litsea rotundifolia var.oblongifolia 〉Aporusa dioica〉Sapium discolor 〉Litsea cubeba 〉Eurya macartneyi.There was significantly negative correlation between the competition intensity and the individual size of objective tree.The relationship of the competition intensity between the competitive tree and the objective tree and the individual size of objective tree followed the power function rule. When the DBH of S.hancei was more than 25 cm,the competition intensity inconspicuously changed into stable situation.