荒芜草坪杂草种群种间相遇机率(PIE)及密度(D)盖度(C)频度(F)的相关性研究

以西南民族大学南门侧草坪为研究对象,分析了草地早熟禾、多年生黑麦草、天胡荽、繁缕、蛇莓等 5个代表性物种的种间相遇机率(PIE)及密度(D)、盖度(C)、频度(F)的相关性。结果表明：当物种密度大时,株丛个体大小与盖度呈正相关,株丛呈随机分布则频度较大,株丛呈群聚分布则频度不一定高。而盖度大时, 频度大小亦与株丛分布的均匀度有关。据PIE分析,以蛇莓和草地早熟禾最大,其次为风轮草,再次为天胡荽、白三叶,最小的为甘油菜,符合实际分布状况。

The Study on Weeds Population in Desolation Lawn Encounter Incidence, and the Relationship to Density (D), Coverage (C) and Frequency (F)

This paper discusses the relationship of density (D), coverage (C), frequency (F) of weeds population in desolation lawn and the population encounter incidence (PIE). The relationships of the five representative species, such as Poa pratensis ,Lolium perenne ,Hydrocotyle sibthorioides,StaeU aria media (L) cyt and Duchesnea indica (Andrews) Focke were analyzed in this study. The results showed that,when the species is high in density,the individual is bigger and coverage degree is higher. A clump presents random distribution, distfi-bution frequency is higher while clump clustering distribution frequency might not be great.When coverage higher, frequency also relates to the degree of consistency of clump distribution. According to the PIE analysis,the PIE of Duchesnea indica (Andrews) Focke and Poa pratensis is the highest; the PIE of Cninopodium chinense (Benth) O. Kumtze ,Hydrocotyle sibthorioides and Trifolium repens are high; the Booippa montana is the lowest,which is corresponded to the actual distribution.