太行山南端野皂荚群落优势种群的分布格局

Patterns of Dominant Populations of Gleditsia heterophylla Communities in the South of Taihang Mountains

根据野外调查的样方资料,应用方差/均值法(扩散系数)及其t检验、聚集指数、平均拥挤度、Green指数、聚集强度、Poisson分布和负二项分布的χ2拟合检验等方法研究了山西太行山南端野皂荚群落优势种群的分布格局。结果表明:野皂荚、荆条、冰草和中亚苔草等具有较强的竞争能力和较宽的生态位而呈聚集分布,小叶鼠李、毛黄栌、黄刺梅和北柴胡等由于特殊的土壤条件、相对较弱的竞争能力和较窄的生态位而呈随机分布。方差/均值法及其t检验是一种较好的研究分布格局的方法,能很好地反映野皂荚群落中的优势种群的分布格局。

Based on the dataset investigated from the field, the patterns of dominant populations of Gleditsia heterophylla communities in the south tip of Taihang Mountains, Shanxi were studied by using v/m（ dispersal index） ratio t-test, clump intensity, mean crowding, intensity index, Green＇ s index, intensity index, X2-test for goodness-of-fit for Poisson distribution and negative binomial distribution, respectively. The results showed that G. heterophylla, Vitex negundo var. heterophylla, thraxon hispidu, Bothriochloa is Lespedeza davurica, L. floribunda, Agropyron cristatum, Carex stenophylloides, Archaemum and Siphonostegia chinensis in those communities followed clumped distribution because those dominants had more strongly competitive ability and more extensive niche than the others. However, Rhamnus parvifolia, Cotinus coggygria vat. Pubescens, Rosa xanthina, Bupleurum chinense Orostachys fimbriatus, Potentilla chinensis, Artemisia brachyloba, Polygala tenuifolia and Themeda japonica followed random distribution because they distributed in special soil types being random distribution and their competitive ability for resources was less than the others. Finally, the result suggested that the application of variance/mean ratio and its t-test together was one kind of fairly good method to analyze population pattern.