【摘要】 以两个散叶生菜品种(弘农和绿领)为材料,研究了塑料大棚栽培条件下不同土壤含水量(分别为田间持水量的60%~100%、60%~90%、60%~80%、60%~70%)处理对生菜生长、品质和生理特性的影响。收获期测定的结果表明,以田间持水量的90%作为灌水量上限条件下生菜地上部干鲜质量、叶面积、叶片数均最高,田间持水量80%为灌水上限条件下生菜地上部的生长优于田间持水量100%为灌水上限处理。随着灌水量上限的降低,生菜可溶性糖、可溶性蛋白含量逐渐升高,田间持水量80%和70%为灌水量上限处理下的维生素C含量显著高于其他两个灌水量上限处理。田间持水量70%的灌水量上限处理下生菜叶片中的MDA(丙二醛)、SOD(超氧化物岐化酶)、CAT(过氧化氢酶)和Pro(脯氨酸)含量最高,膜脂过氧化程度最重。本试验的结果表明,以田间持水量90%为灌水量上限处理下生菜的产量最高,综合不同灌水上限处理对产量和品质的影响,认为田间持水量80%的灌水量上限处理是最适合生菜生长的灌水处理。更多还原

【Abstract】 The effects of different field water capacities(60%～100%,60%～90%,60%～80%,60%～70%) on the growth,quality and physiological characteristics of lettuce were investigated.The results showed that the greatest shoot fresh and dry weight,leaf area and leaf number were obtained by 90% irrigation maxima treatment,soluble sugar,soluble protein of lettuce gradually increased with the decrease of irrigation maxima,the vitamin C contents of lettuce under 80% and 70% irrigation maxima were significantly higher than those of other treatments.The highest contents of MDA,SOD,CAT and Pro were obtained by 70% irrigation maximum treatment.The highest yield was obtained by 90% irrigation maximum treatment,whereas the best irrigation maximum was 80% for the growth and quality of lettuce.更多还原