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文中采用样方调查法,对研究区内油松群落中主要种群的Shannon-Weinner多样性指标及Lev-ins生态位宽度、生态位重叠值和生态位相似比例等进行了分析。结果表明:1)油松群落中油松的生态位宽度最大为0.9827,槲树的生态位宽度最小为0.1582;2)优势种油松与其他物种的生态位重叠值在0.06～0.1之间,反之在0.01～0.05之间,说明油松群落的生态位重叠值不大,群落中因利用相同的资源位而产生的种间竞争并不激烈,是一个稳定的森林群落;3)生态位相似比例大于0.5的有9对,占20%,其物种间生态位相似比例值一般较低,反映其主要物种利用资源的相似程度较小。但是生态位宽度较大的物种之间的生态位相似性比例仍较高,如油松与甘肃山楂、锐齿栎的生态位相似性比例分别为0.5209、0.5320。
In this paper, Shannon-Weinner diversity index, Lev-ins niche breadth, niche overlap value and niche similarity proportion of main populations of Pinus tabulaeformis community in the study area were analyzed by means of quadrat investigation. The results showed as follows: 1) The maximum niche breadth of Pinus tabulaeformis in Pinus tabulaeformis community was 0.9827, and the minimum niche breadth of Oak tree was 0.1582. 2) The niche overlap of dominant tree species was between 0.06 and 0.1, and vice versa 0.01 to 0.05, indicating that the Pinus tabulaeformis community niche overlap is not large, due to the use of the same resources in the community and the resulting interspecific competition is not intense, is a stable forest community; 3) niche similarity ratio There are 9 pairs which account for more than 0.5, accounting for 20%. The similar proportion of the niche among the species is generally low, which shows that the similarities of the utilization of resources by their major species are small. However, the proportion of niche similarity between species with larger niche breadth was still high. For example, the niche similarity of Pinus tabulaeformis and Crataegus albiflorus was 0.5209 and 0.5320, respectively.