模拟根系分区交替滴灌对茄子生长与水分利用的影响研究

通过玻璃土箱试验模拟了交替滴灌方式、固定滴灌方式和常规滴灌方式对茄子生长、根系分布和产量及水分利用的影响。结果表明，交替滴灌使灌溉用水效率明显增加，产量水平上的水分利用效率达58．0kg/m^3，可节约用水30％以上并增加产量；交替滴灌减少水分入渗深度，刺激根系生长，明显提高根密度．并在土壤中分布均匀：交替滴灌通过部分根区干燥产生根源信号调节气孔行为，使蒸腾速率明显降低，而植株光合作用没有受到明显影响，使单叶水分利用效率得以提高。

Study on Effects of Roots-divided Alternate-Drip Irrigation on Growth and Water Use Efficiency by Eggplant

Effects of root-divided alternate drip irrigation on growth,root distribution,yield and water use efficiency (WUE)of eggplant were studied by simulating soil boxes with controlled alternate-drip irrigation for half part of root zone, controlled fixed drip irrigation for half part of root zone and conventional drip irrigation for whole root zone. The results showed that alternate-drip irrigation obviously increased the water use efficiency. The irrigated water was saved by 30% compared with controlled fixed drip irrigation, the WUE computed by yield level was over 58.0kg/m3 and yield was the highest among the three irrigation treatments. The water infiltration depth was reduced by alternate drip irrigation. Meanwhile, the alternate drip irrigation stimulated root growth and enhanced root density, optimized the stomatal behavior, decreased the transpiration significantly and influenced the photosynthetic rates unremarkably so as to elevate the water use efficiency of single leaf.