关帝山神尾沟优势种生态位分析

采用Shannon-Wiener生态位宽度公式和Petraitis生态位重叠指数测定了关帝山神尾沟8种主要乔木、18种主要灌木和42种主要草本种群的生态位宽度和生态位重叠，并对生态位定度和生态位重叠的关系进行了初步的探讨。结果表明，种群生态位定度越大，对环境的适应能力越强；具有相同或相似环境要求的物种间生态位重叠较大，生态位宽度较大的物种与其它种间生态位重叠较大。

Niche Analysis of Dominant Species in Shenweigou of Guandi Mountain

The niche breadths and overlaps of 8 main tree species, 18 main shrub species and 42 main herb species in the Shenweigou of Guandi Mountain were measured using the formulas proposed by Shannon Wiener and Petraitis, and the relationships between niche breadth and niche overlap were discussed in this paper. The results show that the niche breadths of Populus davidiana, Picea meyeri and Betula platyphylla in tree layer and those of Sambucus williamsii, Viburnum shensianum and Spiraea pubescens in shrub layer and those of Dianthus chinensis, Polygonatum verticillatum and Saussurea amara in herb layer were greater, which was related with their own characteristics and the capability of adapting environment.The greater the niche breadths of species was, the more intense the species was adapted to the environment. The niche overlaps among the species with the same or similar environment requirements were great, while those between the species with broad niche breadth and other species were much greater.