鲁北地区地膜覆盖对棉花需水量、作物系数及水分利用效率的影响

Effects of Plastic Mulching on ETc,Kc and WUE of Cotton in Northern Shandong Province

作物系数和需水量是制定作物灌溉制度和计算区域水资源平衡的重要参数,不同气候和不同栽培条件下作物系数和需水量会发生变化。本文通过大田试验,以水量平衡法计算作物需水量、以Penman-Monteith公式计算参照作物蒸散量和作物系数。结果表明,鲁北地区棉花地膜覆盖栽培比露地栽培生育期内作物需水量减少101.5mm,作物系数降低17.6%,水分利用效率增加29.3%。

Crop evapotranspiration （ETc） , crop coefficient （Kc） and water use efficiency （WUE） are basic parameters for establishing irrigation schedule and regional water resources balance. They are changeable under different climate region and cultivation. The aim of this experiment is to understand the effect of plastic mulching on ETc, Kc and WUE of cotton in northern Shandong province. Based on field experiment,ETc was calculated by water balance equation,reference crop evapotranspiration （ETo） and Kc were calculated by using Penman-Monteith equation. The results indicated that the ETc and Kc of cotton in plastic mulching filed decreased by 101.5ram and 17.6% than CK（ no mulch） respectively, and WUE increased by 29.3%.