微咸水灌溉对苗期玉米生长和生理性状的影响

Effects of NaCl on Growth and physiological processes of maize seedlings

以玉米为试验，研究了不同浓度ＮａＣｌ微咸水灌溉对玉米的出苗、干物质累积、光合速率、蒸腾速率、气孔阻力、根系活力及叶绿素浓度的影响。结果表明，３ｇ／Ｌ是灌溉水中ＮａＣｌ含量的上限。在含盐量低于３ｇ／Ｌ的情况下，盐分对苗期玉米的生长有不同程度的促进作用，超过３ｇ／Ｌ时，则会对作物生长产生危害。并简要分析了玉米苗期根系和冠对盐分和不同反应。

Effects of NaCl concentration on emergence, dry matter accumulation, net photosynthetic rate, transpiration rate, stomatal resistance and vigor of root of maize seedling were investigated. Results suggests that upper limit of NaCl concentration for maize seedling is about 3 g/L. The growth of maize seedling is stimulated to some extent as NaCl concentration increase, provided concentration is less than 3 g/L. After higher than 3 g/L, NaCl will be harmful to maize seedling. The differences between shoot's and root's response to NaCl are also presented in this paper.