庞泉沟自然保护区建群种种间竞争规律研究

根据野外调查数据，采用Lotka-Voherra竞争模型，以山西省庞泉沟自然保护区内华北落叶松与云杉为优势树种的群落为研究对象，研究了华北落叶松和云杉种间的竞争关系。结果表明：以华北落叶松种群占优势的混交针叶林将由华北落叶松和云杉种群共优组成。从竞争结果来看，华北落叶松与云杉在同一资源空间中总优势度为452592cm^2／hm^2，皆大于任一树种的优势度。因而，华北落叶松和云杉组成的混交群落，能够更充分地利用环境资源，进而提高林地生产力。

Study on the Law of Interspecific Competition of Constructive Species in Pangquangou Nature Reserve

Field data from forest community in Pangquangou Nature Reserve, which was consisting of Lariz principis-ruppre- chtii and Spruce, were quantitatively analyzed using the Lotka-Voherra competition model for single-tree interspecific com- petition. The results showed that the Lariz principis-rupprechtii and Spruce could jointly dominate a community. The general dominant degree of the Lariz principis-rupprechtii and Spruce was 452 592 cm2/hm2 which was larger than dominant degree of two species in the same resource space. Therefore, the mixed community of Lar/z principis-rupprechtii and Spruce could fully utilize the environment resource to raise the productivity of forest lands.