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冬小麦返青期枯心苗空间分布规律及其抽样方法。结果表明，冬小麦返青期枯心苗空间分布(即地下害虫危害空间分布)呈聚集分布，聚集程度受种植环境影响较大。建立了冬小麦早春枯心苗最适抽样模型及序贯抽样模型。

The spatial distribution and sampling of the withered wheat seedling in the period of returning to green was studied by using the spatial distribution test， the aggregation intensity index test and the linear regression methods. The results showed that the spatial distribution of the dead wheat seedlings(or the underground pest damages) was clustered. The degree of aggregation was greatly affected by the planting environment. The theoretical sampling model of early winter wheat dead seedlings and its sequential sampling model were established.

S435.122