亚高寒草甸不同生境植物群落物种多度分布格局的拟合

物种多度分布是群落生态学研究的核心内容。通过对青藏高原东部亚高寒草甸3种不同生境草本植物群落的抽样调查，结合16个物种多度分布模型的两种曲线拟合优度检验得出如下结果：多种不同模型可以拟合同一生境的物种多度分布。相比于其他可拟合模型，几何级数模型在3种生境中两种拟合优度检验方法下的平均拟合效果是最好的，拟合优度值均在最优拟合优度值10左右波动。次优模型鉴于不同生境不同的检验方法表现不一。除了几何级数模型外，Sugihara分数模型在最小二乘法的拟合方法下，也可以拟合3种生境的物种多度分布。研究结果表明，仅用拟合优度检验区分产生不同物种分布格局的模型和机制是不可靠的，需要做进一步的检验性实验研究。

Fitting different models to species abundance distribution patterns in three plant communities in sub-alpine meadow

Species coexistence mechanisms and species abundance distribution patterns at different time and spatial scale have been and may continue to be key research issues in community ecology,whereas species abundance distribution(SAD) or relative species abundance distribution(RSAD) curve is the common way to describe the species diversity distribution patterns in a community.Species abundance distribution curves have also been used to distinguish different mechanisms for species coexistence.Although there are ma...