The research aimed at exploring quality and photosynthetic response of Allium sativum cv.‘Minlezipi’to altitude changes.The field determination of quality and photosynthetic parameters(Pn ,Tr , Ci ,Gs )of Allium sativum cv.‘Minlezipi’at three elevation sites were carried out.The result showed that the daily average values of Pn ,Tr ,Ci and Gs decreased with the increasing of elevation,but the water use ef-ficiency increased significantly.Compared with the lower altitude,soluble protein,vitamin C and allicin con-tents in garlic bulb were all higher at the higher altitude.Except the total sugar,other quality indicators showed peak value at the highest altitude.Analysis of the results implied that Alliumsativum cv.‘Minlezi-pi’had a good ecological adaptation to the changes of light and temperature of high altitude area.%通过测定甘州城区(海拔高度1500 m)、六坝(海拔高度1900 m)、洪水(海拔高度2300 m)3个示范园民乐紫皮大蒜的净光合速率(Pn )、蒸腾速率(Tr )、胞间 CO2浓度(Ci )和气孔导度(Gs )的日变化曲线,以及大蒜鳞茎中维生素C、可溶性蛋白质、大蒜素和总糖的含量,研究了民乐紫皮大蒜光合日变化和品质对海拔变化的响应。结果表明：随着海拔的增高,民乐紫皮大蒜Pn ,Tr ,Gs 和Ci 的日均值降低,水分利用效率(WUE)显著增加。大蒜中维生素 C、大蒜素的含量,与海拔基本呈正相关关系,均在洪水试验地表现出最大值。民乐紫皮大蒜对高海拔的自然环境变化呈现良好的适应性。高海拔环境可以促进民乐紫皮大蒜活性成分大蒜素的积累,并提高水分利用效率。
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