成都平原区植物群落种间机遇机率(PIE)与种间联结测定分析

Determine and Analysis of the Meeting Rate of Different Plant Species(PIE) and Relationship between Species in the Chengdu Plain

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。

Through the analysis of the quantity characteristic between the advantages species and between the companion living species and the seldom-seen species in the 2 communities and 20 different circles at random in the Chengdu plain deserted lawn.Discussing the meeting rate of different plant species, the relationship between species, the resemblance of the species and the density and frequency of the plant species with emphase. The analysis of statistics showed that： the meeting rate of the advantaged species to other advantages species is higher, but that of the companion living species and the seldom-seen species is lower .The PIE of two communities is higher, the index is 0.878 7 and 0.816 6, respectively. The relationship between species is that Digitaria-sanguinalis and Cyodon-dactylon, Kalimer-indical and Cyperus-rotumdus falls to positive relationship, the relationship between them is remarkable and they depend on each other.