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影响并决定作物有机体生活机能的主要因素是热量,热量的指标多用“积温”来表示。积温又常指“气积温”而言,但气积温不易人为控制。经我们5年(1976—1980年)研究,当通过塑膜地面覆盖,提高“地积温”时,能够在一定范围内补偿因气积温不足而造成的热量歉缺,从而提高利用率。一、塑膜地面覆盖与土壤温度变化的关系(一)对土壤温度日变化的影响据每日3次(8、14、20时)观察,覆盖处理的一天内以14时地温最高,相对增温绝对值差值最大的是20时。如1979年4—6
The main factors affecting and determining the life function of crop organisms are the indicators of calories and calories, which are usually expressed as “accumulated temperature”. Accumulated temperature is often referred to as “gas accumulation temperature”, but the gas accumulation is not easy to artificially control. After our five years (1976-1980) study, when we increase the geotextile temperature through plastic film ground cover, we can compensate for the lack of heat due to lack of gas accumulated temperature to a certain extent, thus improving the utilization rate. First, the plastic film ground cover and soil temperature changes (A) of the diurnal variation of soil temperature According to the daily 3 times (8,14,20 hours) observation, covering the day at 14:00 the highest temperature, the relative increase The absolute value of the absolute temperature difference is 20 o’clock. Such as 1979 4-6