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基于4a的田间试验资料,采用农田水分平衡法确定了旱稻出苗后各生育阶段的需水量;利用1971年-2000年北京地区逐日降水资料,计算了旱稻各生育阶段在不同降水保证率下的降水量,并选取25%、50%、75%和95%保证率作为典型的湿润年、平水年、干旱年和极枯水年,进行旱稻各生育阶段降水与作物需水的耦合度分析和补灌量估算。结果表明:旱稻出苗后总需水量平均为596.1mm,需水强度平均为4.3mm/d,需水强度峰值出现在孕穗-抽穗阶段。4种降水年型下旱稻出苗后降水和旱稻需水的耦合度分别为0.82、0.71、0.50和0.39,所需的补灌量分别为106.6、171.1、296.0和363.9mm。
Based on field data from field 4a, the water requirement of paddy rice at each growth stage was determined using the farmland water balance method. The daily precipitation data from 1971 to 2000 in Beijing were used to calculate the precipitation at different growth rates And choose 25%, 50%, 75% and 95% of the guaranteed rate as the typical wet years, flat water years, dry years and extremely dry years, carry on the analysis of the coupling degree of precipitation and crop water requirement Estimated irrigation. The results showed that the average water requirement of upland rice was 596.1 mm after emergence, the average water requirement was 4.3 mm / d, and the water demand peak appeared at booting stage. The coupling degree of dry-up rice after precipitation and water requirement of upland rice were 0.82,0.71,0.50 and 0.39 for the four types of precipitation years respectively, and the required supplementary irrigation amounts were 106.6,171.1,296.0 and 363.9mm, respectively.