苗期娃娃菜田藜科藜属杂草空间分布型及其抽样技术研究

Spatial Distribution Pattern and Sampling Technology of Chenopodiaceae Chenopodium Weeds in Baby Cabbage Fields at Seedling Stage

采用随机调查的方式,利用空间分布型检验、聚集强度指标检验和线性回归方法,研究了甘肃黄羊河农场苗期娃娃菜田藜科藜属杂草空间分布型及其抽样技术。结果表明,苗期娃娃菜田藜科藜属杂草空间分布型呈聚集分布。根据平均拥挤度(M*)与平均密度(■)Iwao回归关系,建立了娃娃菜田藜科藜属杂草防治最适抽样模型,N=3.8416/D2(1.4146/■+0.0524),序贯抽样模型T(1、2)=4n±4.9958√n。

The spatial distribution pattern and sampling technology of Chenopodiaceae Chenopodium weeds in baby cabbage fields of Gansu Huangyanghe farm were studied by random survey,spatial distribution pattern test and linear regression methods.The results showed that the spatial distribution pattern of Chenopodiaceae Chenopodium weeds in seedling baby cabbage fields was aggregated.According to the Iwao regression relationship between the average crowding degree(M*)and the average density(■),the control theoretical sampling number model of Chenopodiaceae Chenopodium weeds in baby cabbage fields was N=3.8416/D2(1.4146/■+0.0524),and its sequential sampling model was T(1、2)=4n±4.9958√n.