半干旱区甜菜水分生产函数试验研究

为了研究甜菜的耗水规律和节水方法以达到在半干旱区大面积推广的目的,在具有典型半干旱区气候特征的甘南县,以不同生育期的土壤水分水平作为控制的纸筒甜菜盆栽试验,对甜菜蒸腾量和产量之间的函数关系和生育期耗水规律进行了研究,得出了不同生育期甜菜蒸腾量和产量之间的函数关系.采用Jensen模型进行了水分生产函数的求解,建立了甜菜的水分生产函数模型.试验结果表明,甜菜各个生育期耗水量从小到大依次是苗期、糖分积累期、叶丛生长期和块根增长期,需水高峰期在7月和8月;水分敏感指数的变化规律与甜菜的耗水规律相一致,叶丛生长期的λ值最大,说明这个时期甜菜对水分的需求特别敏感,应该重点进行补水灌溉.

Experimental Research on Water Production Functions of Beet in Semi-arid Area

In order to study the water consumption rule and the water-saving method of sugar beet and achieve the goal of spread the method with big area in the semi-arid region,the paper-potted planting sugar beet experiments,in which the soil moisture in different growth period is considered,are conducted in Gannan country,which has the typical semi-arid climate character.The relation function between transpiration and production and the water consumption rule in the whole growth period of sugar beet are obtained.Th...