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本文探讨了植物病害普遍率与严重度关系(I…S),并根据单利式和复利式病害的流行特征,提出了以下二个模型: (1) S=Smax/[1+a(1-I)~b] (2) S=Smax/[1+a((1-I)/I)~b] 这里,a、b均为大于零的常数,Smax为严重度的最大值,小于或等于1。文中对单季稻纹枯病,小麦赤霉病和油菜菌核病等的多组I…S关系数据进行拟合,并与Gompertz衍生模型(王振中等,1987)作了比较,表明(2)式拟合效果最佳。
In this paper, we discuss the relationship between plant disease prevalence and severity (I ... S) and propose the following two models according to the epidemiological characteristics of simple and compound diseases: (1) S = Smax / [1 + a (2) S = Smax / [1 + a ((1-I) / I) ~ b] where a and b are constants greater than zero, Smax is the maximum value of the severity less than Or equal to 1. In this paper, multiple sets of I ... S data were fitted to single season rice sheath blight, wheat scab and sclerotinia sclerotiorum, and compared with Gompertz’s derivative model (Wang Zhenzhong et al., 1987) Fitting best.