毛乌苏沙地膜下滴灌青贮玉米作物需水量研究

Study on Water Requirements and Crop Coefficients of Silage Maize under Mulched Drip Irrigation in Maowusu Sandlot

基于2011年内蒙古鄂尔多斯市乌审旗毛乌素沙地试验站气象数据,研究了充分供水条件下膜下滴灌青贮玉米的需水规律。结果表明,膜下滴灌下作物生长发育(株高和叶面积指数)好于常规滴灌,全生育期内青贮玉米的蒸发蒸腾量、平均日耗水强度低于常规滴灌,在青贮玉米整个生育期内有一定的节水保墒效果,有利于作物充分吸收水分。膜下滴灌和常规滴灌青贮玉米作物系数在整个生育期内是先增大后减小的单峰变化曲线,且膜下滴灌低于常规滴灌。

According to the meteorological data in Maowusu sandlot of Mongolia Erdos in 2011, the water requirements of silage maize under mulched drip irrigation in the sufficient water supply condition were analyzed. The results showed that the heights and LAI of silage maize under mulched drip irrigation were higher than conventional drip irrigation while evapotranspiration quantity and water consumption in the whole growth stages were lower than conventional drip irrigation. Drip irrigation under mulch could save and preserve the soil moisture, and promote the water uptake. Crop coefficient increased first, then decreased with a single-peak curve in the whole growth stages, and crop coefficient was lower under mulched drip irrigation than conventional drip irrigation.