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在农业气象学中,活动积温指作物在某时期内活动温度的总和。每种作物都有一个生长发育的下限温度,这个下限温度一般用日平均气温表示。低于下限温度时,作物便停止生长发育,但不一定死亡;高于下限温度时,作物才能生长发育。活动温度即指大于生长下限温度的日平均温度,以t>Bt表示。如某天的日平均温度为15℃,而某作物的下限温度为10℃,则当天对该作物的活动温度就是15℃。因此活动积温表示为:
In agrometeorology, active accumulated temperature refers to the total temperature of the crop during a certain period of activity. Each crop has a growth and development of the lower limit temperature, the lower limit of the temperature is generally expressed as the average daily temperature. Below the lower limit temperature, the crop will stop growth and development, but not necessarily death; above the lower limit temperature, the growth and development of crops. Activity temperature refers to the daily average temperature above the growth limit temperature, expressed as t> Bt. If the daily average temperature for a day is 15 ° C and the minimum temperature for a certain crop is 10 ° C, then the activity temperature on that day is 15 ° C. Therefore, activity accumulated temperature is expressed as: