缙云山特有植物缙云黄芩种群生态位研究

采用Levins生态位宽度、Hurlbert生态位宽度及Pianka生态位重叠等计算公式,测定了缙云黄芩(ScutellariatsinyunensisC Y WuetS Chow)所在群落中草本层物种的生态位宽度和生态位重叠.结果显示:缙云黄芩的生态位宽度较大,说明该种生态适应幅度较大;与其主要伴生物种间的生态位重叠也较大,表明它们对资源利用的相似程度较高.

Niche Studies on Populations of Scutellaria tsinyunensis of Endemic Species from Mt.Jinyun of Chongqing

Based on the data from the field investigation, and with the help of the equations of Levins' niche and Hurlbert's niche breadths, we studied the niche breadths of the populations of Scutellaria tsinyunensis C. Y. Wu et S. Chow, an endangered plant endemic to Mt. Jinyun, Chongqing. The result shows that the niche breadths of the populations of Scutellaria tsinyunensis C. Y. Wu et S. Chow are the greatest we studied, which indicates the ecological adaptation of Scutellaria tsinyunensis is relatively stronger and the abilities of utilizing resources are greater. With the help of Pianka's niche overlap we further studied the niche overlap among different species in the sampled communities. The niche overlap among the species with the same or similar environment requirements are greater, especially niche overlap between Scutellaria tsinyunensis and those with broad niche breadths in the communities are much greater. The competition among those species like Scutellaria tsinyunensis, Dryopteris erythrosora, Veronicastrum stenostachyum, etc., is intense in the communities, which may be one of the reasons why Scutellaria tsinyunensis is going to be endangered and with a very shrinking distribution.