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根据黑龙江省 2 2个市县病害调查的结果 ,选择与病害密切相关的 9项气象因子为指标进行聚类分析 ,将黑龙江省樟子松枯梢病危险等级划分为重发区、常发区、偶发区和安全区 4级。经证实 ,等级的划分与病害调查的实际情况基本一致。
According to the survey results of 22 cities and counties in Heilongjiang Province, nine meteorological factors closely related to the disease were chosen as the index to carry on the cluster analysis. The classification of the risk level of Shoot Pinus sylvestris var.mongolica in Heilongjiang Province was divided into the recurrent area, , Sporadic Zone and Safety Zone Level 4. It has been confirmed that the division of levels is basically the same as the actual situation of the disease investigation.