麦田杂草群落主要杂草种群主成分分析

Principal Component Analysis of Main Weed Populations in Wheat Field

对江苏省南京市和安徽省滁州市麦田杂草群落进行了调查,测定了隶属8科19属的20种杂草的重要值,并用主成分分析的方法,研究了主要杂草种群在群落中的地位。结果表明,2地杂草群落均以菵草(Beckmannia syzigachne)为优势种,但主要杂草种群的组成及其重要值有一定的差异。所调查的南京市的麦田中,杂草种群主要在菵草、大巢菜(Vicia sativa)、早熟禾(Poa annua)、泽漆(Euphorbia helioscopia)和黑麦草(Lolium perenne)等5个方向上分化,而滁州市麦田的杂草种群则主要在菵草、大巢菜、野老鹳草(Geranium carolinianum)、看麦娘(Alopecurus aequalis)和野燕麦(Avena fatua)等5个方向上分化。

Important values of 20 weed populations belong to 19 genera, 8 families in wheat fields of Nanjing City and Chuzhou City were investigated, and the principal component analysis （PCA） of main weed populations were conducted. Results showed that Beckmannia syzigachne was the dominant population in the weed communities of both Nanjing and Chuzhou. In the wheat fildeds investigated in Nanjing, weed population differentiation occurred mainly in five directions of Beckmannia syzigachrte, Vicia sativa, Poa annua, Euphorbia helioscopia and Lolium perenrte. While in that of Chuzhou, weed population differentiation mainly occurred in five directions of Beckmannia syzigachne, Vicio sativa, Geranium carolinianum, A Iopecurus aequalis and A vena fatua.