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推算作物生育期、害虫发生期、各种虫期以及病害潜育期等等数值时，往往都要依据有效积温,而有效积温的计算以往多根据日平均气温(以下简称平均法)。如某一害虫的发育起点温度为10℃,在1981年328日,最高气温(Tx)为15.4℃,最低气温(Tn)为0.8℃,日平均气温(T)为8.1℃,如果按平均法推算,该日有效积温为“0”,然而,追踪24小时气温的变化曲线(图1),就会发现在达到最高气温前后10小时里气温超过了10℃,必然积累了有效温量,这个害虫
Calculating the crop growth period, the pest occurrence, various stages of insects and disease latent period and so on are often based on effective accumulated temperature, and effective calculation of accumulated temperature in the past based on the daily average temperature (hereinafter referred to as the average). For example, the starting temperature of a pest is 10 ℃. In 1981, the highest temperature (Tx) was 15.4 ℃, the lowest temperature (Tn) was 0.8 ℃, and the average daily temperature (T) was 8.1 ℃. However, tracking the curve of 24-hour temperature (Figure 1), you will find that 10 hours before and after reaching the maximum temperature over 10 ℃, the inevitable accumulation of an effective temperature, this Pests