山西稀有濒危植物脱皮榆种内和种间竞争

Intra-and inter-specific competition of rare and endangered plant Ulmus lamellosa in Shanxi Province of China

通过对山西太岳山一块100 m×100 m样地中128株脱皮榆对象木及1093株竞争木的调查,运用Hegyi的单木竞争指数计算分析了脱皮榆的种内和种间竞争强度。结果表明:(1)脱皮榆种群所受到的竞争强度随着对象木胸径的增大而逐渐减小;(2)调查样地内尽管其他物种种类较多,但数量较少,与脱皮榆种间竞争相对较弱,脱皮榆种内与种间竞争关系的顺序为:脱皮榆-脱皮榆>千金榆-脱皮榆>五角枫-脱皮榆>茶条槭-脱皮榆>其他树种-脱皮榆;(3)竞争强度和对象木胸径的关系服从幂函数关系,当脱皮榆胸径在25 cm以上时,竞争强度变化不大,所得的预测模型能很好地预测脱皮榆种内种间竞争强度。

服务 把本文推荐给朋友 Based on the field investigation data of 128 Ulmus lamellosa target trees and 1093 competing species individuals in a 100 m×100 m sampling plot in Taiyue Mountain of Shanxi, this paper analyzed the intra-and inter-specific competition intensities of U. lamellosa by using Hegyi＇s competition index （CI）. The intraspecific competition intensity of U.lamellosadecreased gradually with its increasing DBH. In the plot, there were many other species, but their individual number was fewer than that of U. lamellose, and thus, the interspecific competition intensity of U. lamellosa was relatively weaker than its intraspecific competition. The order of the intra- and inter-specific competition intensities was U. lamellosa-U. lamellosa 〉 Carpinus cordata-U. lamellosa 〉 Acer elegantulum-U. lamellosa〉 other species-U. lamellosa. The relationships between the competition intensity and the DBH of U. lamellosa followed the equation CI=AD-B. When the DBH of U. lamellosa reached 25 cm, the competition intensity had less change, and the model could well simulate and predict the intra-and inter-specific competition intensities of U. lamellosa.