甘肃省屈吴山自然保护区不同森林群落类型的种群分布格局

以甘肃白银屈吴山不同森林群落中不同种群为研究对象,通过测量方差/均值比(S2/x)、负二项参数(k)、Monisita扩散型指数(I)、丛生指数(I)、Cassie指标(CA)、平均拥挤度(m*)和聚块性指标(m*/m)等6项指标来研究其种群空间分布格局,结果表明:山杨、云杉、华山松、白桦纯林的分布格局呈聚集分布;混交林中的白桦、山柳、油松、刺柏的分布格局呈均匀分布或呈随机分布。

Population distribution patterns of different communities in Quwu Mountains Natural Reserve of Gansu province

Six indexes for spatial pattern detection of different populations in different communities in Quwu Mountains in Baiyin of Gansu province, including variance to mean ratio(S2/x), negative binomial parameter(k), Monisita dispersity index(I), clumping index(I), Cassie index(CA), mean crowding index(m*)and index of patchiness(m*/m), were measured in order to study the population distribution pattern. The results showed that the distribution patterns of Populus davidiana, Picea asperata, Pinus armandii and Betula platyphylla pure forest population were of clump; the distribution patterns of Betula platyphylla, Salix oritrepha, Pinus tabulaeformis and Juniperus formosana population in the mixed forest were of uniform or poisson.