为了给大田玉米苗期藜科杂草科学防治和预测预报提供参考，采用空间分布型检验、聚集强度指标检验和线性回归方法，研究了苗期露地玉米田藜科杂草空间分布型及其抽样技术。结果表明:河西地区苗期露地玉米田藜科杂草空间分布型呈聚集分布，根据Iwao回归和Iwao理论抽样模型，得出其最适抽样模型为n=3.841 6/D2(1.360 2/■-0.101 6)，序贯抽样模型为T(1、 2)=4n±3.828■。

In order to provide the reference for the control and prediction of Chenopodiaceae weeds in corn fields at the seedling stage， the spatial distribution pattern and sampling technology of Chenopodiaceae weeds in open fields of corn without plastic film covering were studied by using spatial distribution pattern test，aggregation intensity index test and linear regression methods. The result showed that the spatial distribution of Chenopodiaceae weeds in open fields of corn at seedling stage in Hexi Area was aggregation distribution. According to Iwao regression and Iwao theoretical sampling model， the optimal sampling model was n=3.841 6/D2(1.360 2/■-0.101 6) and the sequential sampling model was T (1、 2)=4n±3.828■.

S513；S451