一、引言在农、林、气象以及生物学的研究中,常常需要应用温度的积累值,也就是温度对时间的积分值,简称“积温”。一般农作物最适宜的生长温度为3°～40℃(温度过高或过低都不利于植物的生长,甚至会造成停止生长)。这一温度范围通常称为作物生长的“有效温度”。作物生长不但需要一个有效温度范围, I. INTRODUCTION In the research of agriculture, forestry, meteorology and biology, it is often necessary to apply the accumulated temperature value, that is, the integrated value of temperature with respect to time, referred to as “accumulated temperature” for short. The most suitable growth temperature of general crops is 3 ° ~ 40 ℃ (the temperature is too high or too low are not conducive to the growth of plants, and even cause the growth to stop). This temperature range is commonly referred to as the “effective temperature” of crop growth. Crop growth not only requires an effective temperature range,