根区交替地下滴灌对马铃薯产量及水分利用效率的影响

Effects of alternate partial root-zone subsurface drip irrigation on potato yield and water use efficiency

采用田间试验方法,研究了根区交替地下滴灌(APRI)对马铃薯生理指标、产量及水分利用效率的影响.结果表明:在马铃薯块茎生长期,与对照处理(CDI)相比,APRI处理的马铃薯叶片光合速率的降低不显著(4.7%),而蒸腾速率和气孔导度则明显降低,降幅分别达15.8%和15.4%,CDI处理略高的光合速率是以消耗更多的水分为代价;与CDI处理相比,APRI处理的马铃薯产量仅降低5.4%,但灌溉水量却节省了25.8%,使灌溉水分利用效率和总水分利用效率分别提高了27.5%和15.3%.对于马铃薯来说,根区交替地下滴灌是一种切实可行的节水灌溉技术.

Field experiment was conducted to investigate the effects of alternate partial root-zone subsurface drip irrigation （APRSDI） on the physiological responses,yield,and water use efficiency of potato.Compared with conventional drip irrigation （CDI）,APRSDI had less negative effects on the potato leaf photosynthesis rate （Pn）,but decreased the transpiration rate and stomatal conductance significantly.The slightly higher Pn under CDI was at the expense of consuming more water.No significant difference was observed in the potato yield under APRSDI and CDI,but APRSDI saved the irrigation amount by 25.8% and increased the irrigation water use efficiency and total water use efficiency by 27.5% and 15.3%,respectively,suggesting that APRSDI would be a feasible water-saving irrigation technique for the planting of potato.