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根据水量平衡方程式计算,雨养麦田三个试验麦季的耗水量分别为435.5、326和293.8mm,它们可代表该区过湿、一般和干旱年分的小麦耗水量。小麦地上部分生物量(茎杆+籽实)与其耗水量成正比,以第一麦季为100,第二、第三麦季分别为85和70;但籽实产量的反应与地上部生物量的反应并不一致,它们分别为100、102、70,以第二麦季最高。由于该麦季的耗水量相对较少,故有很高的水分利用率(1.73×10~(-3)kg/1)为华北地区所罕见。在耗水量中,土嚷储水的贡献约占50%。在降雨少而土壤储水丰足的年份,其贡献高达60%,是小麦水分的重要来源。在充分施肥条件下,小麦的水分利用率≥1.26×10~(-3)kg/1,它是建立预测小麦产量的经验模型的重要参数。
According to the equation of water balance, the water consumption of wheat in three rainy season wheat fields was 435.5, 326 and 293.8 mm, respectively, which could represent the water consumption of wheat in over-wet, normal and drought years. The above-ground biomass (stems + seeds) of wheat was proportional to the water consumption, with the first wheat season at 100 and the second and third wheat seasons at 85 and 70, respectively. However, the response of seed yield to shoot biomass Are not consistent, they were 100,102,70, the highest in the second wheat season. Due to the relatively low water consumption during this season, high water use efficiency (1.73 × 10 -3 kg / 1) is rare in North China. In the water consumption, soil shout water contribution of about 50%. It contributes as much as 60% of the total rainfall in a year with low rainfall and abundant soil water, making it an important source of water for wheat. Under sufficient fertilization, the water use efficiency of wheat is more than or equal to 1.26 × 10 ~ (-3) kg / 1, which is an important parameter for establishing an empirical model for forecasting wheat yield.