亚高寒草甸植物群落的中性理论验证

 该文以物种组成较为复杂的青藏高原东部亚高寒草甸为背景，结合最新的群落中性理论，以解释亚高寒草甸草本植物群落的物种分布格局和生物多样性的维持机制。通过对阴坡、阳坡和滩地3个生境进行随机取样调查，用中性模型对所得多样性数据进行拟合，并分别应用置信区间检验、拟合优度检验和多样性指数检验3种方法对拟合效果进行检验。研究结果表明，在拟合优度检验中，3个生境中中性理论预测和实际物种多度分布之间没有显著差异(p>0.05)；实际观测值基本全部落入模型预测分布的95%的置信区间之内（仅滩地草本植物群落的63个物种中的1个以及阴坡草本植物群落75个物种中的2个偏离95%的置信区间）；对群落多样性的预测也和实际观测没有显著差异，其中丰富度预测拟合得最好(0.49

TESTING THE NEUTRAL THEORY OF PLANT COMMUNITIES IN SUBALPINE MEADOW

Aims We tested the neutral theory of biodiversity on subalpine meadows of the eastern Tibetan Plateau that exhibited comparatively complicated species composition. Our objective was to explain the species abundance distribution pattern and the underlying mechanism of biodiversity.  Methods We fit the neutral model to a randomly sampled data set obtained in three different habitats (north-facing slope, level field and south-facing slope) and used three methods to test the fitness of the neutral model to the real community: confidence interval, goodness of fit and diversity index. Important findings We found no significant difference (p>0.05) between the neutral theory predictions and observed species abundance distributions in the three habitats according to the goodness of fit method. The observed data nearly completely fall into 95% confidence intervals of the neutral model predictions (only one out of 63 species in level field communities and 2 out of 75 species in the north-facing slope communities deviate from the 95% confidence interval). There is no significant difference between the neutral theory predictions and observed species abundance patterns, in which the fit of richness predictions is the best (0.49