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通过室内三组桶栽水平试验,在不同生育期对棉花根系进行取样,得到棉花根长密度分布函数,并在每次灌水前后对试验桶进行取土样及称重,进而得到土壤剖面的含水量和棉花的蒸腾量;由根长密度分布函数、土壤含水量及棉花蒸腾量,选定根系吸水模型为Feddes模型,经模型计算:土壤水分的模拟值与实测值吻合较好,该模型能够准确地描述膜下滴灌棉花根系吸水,表明建立的棉花根系吸水模型是可行的。
Through the indoor three groups of barreled horizontal test, cotton roots were sampled at different growth stages to obtain the cotton root length density distribution function, and the test barrel was sampled and weighed before and after each irrigation to obtain the soil profile Water content and transpiration of cotton. Root density function, soil moisture content and cotton transpiration were selected as Feddes model. The model was used to calculate the root water uptake model. The simulated values of soil moisture were in good agreement with the measured values. Accurately describe the cotton under water drip irrigation under the film, indicating that the establishment of the cotton root water absorption model is feasible.