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通过测定论述了成都平原区荒芜草坪2个群落及20个(直径30 cm)随机分布不同样圈中优势种之间及优势种与伴生种、偶见种之间的数量特征。重点探讨不同植物种间相遇机率(PIE)、种间联结与相关、物种相似性、种群密度(D)与频度(F)的关系。统计分析获知:优势种间的相遇机率较高,伴生种、偶见种较低。但2个群落的PIE均属较高,分别为0．8787和0．8166。种间联结关系是马唐与狗牙根、马兰与香附子均属正联结,相关关系显著,互为依存。
The quantitative characteristics of two communities of barren lawns and 20 species (30 cm in diameter) randomly distributed in different sampling circles and between dominant species, associated species and even species in Chengdu plain were discussed. It mainly focuses on the relationship among different plant species (PIE), interspecies association and species similarity, population density (D) and frequency (F). Statistics and analysis showed that there was a high probability of encountering dominant species, accompanying species and occasionally lower species. However, the PIEs of the two communities were all higher, 0.8787 and 0.8166 respectively. Interspecific association is the Crabgrass and Bermudagrass, Malan and Cyperus rotundus are positive, the correlation is significant and interdependent.