模拟调亏灌溉对玉米根系生长及水分利用效率的影响

Effect of Simulated Regulated Deficit Irrigation on Root Growth and Water Use Efficiency in Maize

以营养液培养的方法，在模拟调亏灌溉下研究玉米根系生长和蒸腾效率的变化，并确定了调亏灌溉的根系水势范围与调亏时间，证明调亏灌溉能够在一定土壤水势范围内刺激根系生长，减少作物蒸腾、提高作物水分利用效率。同时，通过实验证明了不同调亏方式下根系的生长状况有着明显的差异。选择适宜的水势范围和调亏周期对作物根系生长、光合作用、蒸腾效率的增加均有良好的效果。

The root growth and evapotranspiration efficiency of maize under simulated regulated deficit irrigation(RDI) were studied with nutrition solution culture. In this paper, the optimal time to conduct RDI and the appropriate range of solution water potential to be maintained are analyzed based on the basis of experimental data. It is shown that the differences of root growth in different regulated deficit treatment are significant. The results also confirm that root growth, photosynthesis, water use efficiency can be improved by conducting RDI in suitable stages and water potential range.