【摘要】 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。更多还原

【Abstract】 According to the result of disease investigation for 22 counties and cities in Heilongjiang Province, the clustering analysis was made through using 9 meteorological factors closely correlated with shoot blight of Pinus sylvestris var. mongolica as main indexes. The risk grade of shoot blight is divided into 4 districts: seriously occurring district, commonly occurring district, occasionally occurring district and safe district. It proves that the division of the risk grade is almost identical with the fact of disease investigation in field.更多还原