麦田泽漆的空间分布型及抽样技术研究

研究表明，麦田泽漆在各种密度下都是聚集分布，且聚集强度随密度升高而增强。其个体间相互吸引，分布的基本成分是个体群，聚集的主要原因是其自身种子集中散落的结果。棋盘式、平行线式和“Ｚ”字型取样均适合泽漆的田间调查，尤以棋盘式取样最佳。同时给出了不同密度下的最适抽样数。

Spacial Pattern and Sampling Techniques of Euphorbia heliosupia L.in Winter Wheat Field

The study showed that the distribution of Euphorbia heliosw pia L.in the winter wheat field was contagious in the different densities.The contagious intensity enhanced with the increase of the density of the weed.The individual plant drew each other and the basic element of the distribution was colony.The main reason for the contagious distribution pattern was due to the aggregated falling of the weed seed.The types of chessboard,parallel line and “Z” sampling were suitable for the field investigation of the weed.Among them the best one was the chessboard sampling.The optimum sampling number for the different densities of the weed was given in the paper.