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武夷山存留着典型的中亚热带原生性森林生态系统,为进一步探索该区域物种多样性的形成和维持机制,探讨了样地内物种多样性指数的空间分布格局及其尺度效应。以福建武夷山9.6 hm2森林动态监测样地内的乔木(≥1 cm)为研究对象,分别在7个取样尺度(5 m×3 m、10 m×6 m、20 m×12 m、40 m×24 m、80 m×48 m、133.3 m×80 m、200 m×120 m)上,计算其Simpson多样性指数、Shannon-Wiener多样性指数和Pielou均匀度指数,并采用方差、变异系数描述其空间变异特征以及各指数与取样尺度的关系。结果表明,3种指数均与取样尺度相关,且表现出较强的区域性分布特征。此外,物种多样性的多寡不仅与空间尺度密切相关,其分布特征也具有尺度推演规律。因此,今后在对植物群落物种多样性进行分析时,应慎重进行物种多样性尺度推演,同时应考虑因取样尺度和取样区域的不同而带来的空间差异。
In order to explore the mechanism of the formation and maintenance of species diversity in the region, the spatial distribution pattern and its scale effect of species diversity index in the plots were discussed. Taking the arbor (≥1 cm) in the 9.6 hm2 forest dynamic monitoring plots in Wuyishan of Fujian as the research object, the sampling scale (5 m × 3 m, 10 m × 6 m, 20 m × 12 m, 40 m × 24 Simpson diversity index, Shannon-Wiener diversity index and Pielou evenness index were calculated on the basis of variance, coefficient of variation Variation characteristics and the relationship between each index and sampling scale. The results showed that all three indices were related to the sampling scale and showed strong regional distribution. In addition, the diversity of species is not only closely related to the spatial scale, but also its distribution characteristics have scale rules. Therefore, in the future when analyzing the species diversity of plant communities, the scale of species diversity should be deduced with caution. At the same time, the spatial differences due to the sampling scale and sampling area should be considered.