荧光灯下不同光周期对生菜形态指标、品质和离子吸收量的影响

Impact of Different Photoperiods on the Morphological Index,Quality and Absorptive Amount to Ions of Lettuce in Fluorescent Light Source

以"美国大速生"和"香港玻璃"2个散叶生菜品种为试材,研究了12、16、20h3个不同光周期对生菜形态指标、品质和离子吸收量的影响。结果表明:光周期的延长能够显著提高生菜的株高、叶数、第7叶叶长及叶宽、地上部分鲜重、地下部分鲜重和地上部分干重;随着光周期的延长,生菜可溶性糖含量显著增加,硝酸盐含量显著减少,以上二者呈负相关关系,蛋白质含量无显著变化;随着光周期的延长,生菜对硝酸根、磷酸根和钾离子的吸收量显著增加,铵根吸收量有所增加,但并不显著。

Taking ＇American Dasusheng＇ and ＇ Hongkong Boli＇ two scattered lettuce varieties as materials, three photoperiods（12 h, 16 h, 20 h） were set, the impact of different photoperiods on lettuce＇s morphological index, quality and absorptive amount to ions were conducted. The results showed that the photoperiod extension could improve lettuce＇s height,length and width of the seventh leaf, above-ground fresh weight, root fresh weight and shoot dry weight significantly the extension of photoperiod could increase soluble sugar content and reduce nitrate content of lettuce significantly in which there was a negative correlation between soluble sugar content and nitrate content,and the change of protein content had no significance the extension of photoperiod could result in the significant increase of absorptive amount of lettuce to nitrate ions,phosphate ions and potassium ions,and the increase of absorptive amount to ammonia ions was not significant.