干旱胁迫对土壤水分动态及玉米水分利用效率影响研究

为研究干旱胁迫效应下土壤的水分动态及玉米水分利用效率,设置干旱胁迫处理和正常灌水处理2种模式,比较不同处理下土壤的水分特征、耗水规律和水分利用效率。结果表明:作物进入拔节期以后,干旱胁迫效应明显,土壤水分开始显著低于正常灌水处理;灌溉后的作物耗水量显著高于干旱胁迫处理,灌溉是影响研究区域玉米生长水分条件的主要因素,玉米进入生殖生长阶段后灌水较不灌水处理的日耗水量增长幅度达到了1.4~7.0倍;干旱胁迫对玉米产量造成严重影响,产量下降54.6%,但是水分利用效率较正常灌水处理高27.3%。

Effects of Drought Stress on Soil Moisture Dynamics and Water Use Efficiency in Corn

To study the soil moisture dynamics and water use efficiency under drought stress condition, the authors designed an experiment with two modes including drought stress and normal irrigation treatment, to compare the soil water character, water consumption rules and water use efficiency. The results showed that: after the jointing period, the drought stress effects were obvious and the soil moisture under drought stress treatment was significantly lower than that under normal irrigation treatment. The water consumption after irrigation was significantly higher than that under drought stress treatment. Irrigation was the main factor affected the growth moisture condition of corn in this research area. The corn water consumption per day under normal irrigation treatment increased 1.4-7.0 times compared with that under drought stress treatment after entering reproductive growth stage. The corn yield was seriously affected by drought and declined 54.6%. But the corn water use efficiency under drought stress increased 27.3% than that under normal irrigation treatment.