中文摘要：

为探讨不同浓度海水处理对植物水分利用效率的影响，以南芋2号为试材，研究了不同浓度海水浇灌对菊芋幼苗生长发育、光合特性及水分生理的影响。结果表明：随着浇灌海水的浓度的提高，株高和地下部生物量呈现出相似的变化趋势，即先增加后减少；净光合速率在海水浓度为10％时显著高于其他处理，而气孔导度同样在10％时具有最大值。低浓度的海水处理有助于提高植物水分利用效率；丙二醛含量在低浓度时差异不显著，40％时其含量明显升高。在叶片持水力上，随着海水浓度的增加，叶片保水性逐渐增加；土体上下盐分含量随着海水浓度的增加而增加，且上层盐分含量高于下层。

英文摘要：

In order to study the effects of the plants water use efficiency under different concentrations seawater treatments, Jerusalem artichoke （Nanyu 2） was used to study the effects of growth and development, photosynthesis characteristics and water physiology irrigated with different concentrations seawater. The results indicated that the changes of plant height and root biomass took on similar trend, that is, increased under 5% and 10% seawater, then reduced under 30% and 40% seawater. The treatment of 10% seawater concentration had much higher net photosynthetic rate and stomatal conductance than other treatments. And water use efficiency of plant was improved under 5% and 10% seawater treatments. There was no significance in the MDA contents with 5%, 10%, 20% and 30% seawater, but its content improved significantly with 40% seawater treatment. In the aspect of water retention capability, it augmented gradually with the seawater concentration increasing. When the seawater concentration increased, the soil salt content increased with the seawater concentration increasing, and it was higher in and in the top 0-5 cm than in the bottom 5-17 cm.