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通过不同氮水平处理,研究瓜蚜Aphis gossypii生殖力、黄瓜叶片游离氨基酸、可溶性糖含量的变化,探讨施肥水平与蚜虫繁殖的关系。结果显示,高氮水平(210、280mg/L)处理瓜蚜生殖力明显高于低氮水平(70、140mg/L)处理,其中140 mg/L氮水平处理,蚜虫的内禀增长率、单雌平均每日产仔量、净增值率等最低,种群数量增加量最小;不同氮水平处理黄瓜叶片内游离氨基酸和可溶性糖含量有明显变化,随着氮水平增加,16种游离氨基酸的总量增加、可溶性糖的含量降低;蚜虫内禀增长率与叶片内游离氨基酸增加量和对照增加量的比值呈现正相关,与可溶性糖的含量呈负相关,且均达到显著水平。结果表明不同氮水平通过改变叶片内游离氨基酸和可溶性糖的含量而影响蚜虫的繁殖和种群的增长。
Through the treatment of different nitrogen levels, the fertility of Aphis gossypii, the changes of free amino acids and soluble sugar in cucumber leaves were studied, and the relationship between fertilization and aphid reproduction was discussed. The results showed that the fertility of A. gossypii treated with high nitrogen (210 and 280 mg / L) was significantly higher than that with low nitrogen (70 and 140 mg / L), including 140 mg / L N treatment, intrinsic rate of aphid growth The average daily live birth weight and net increment rate of female were the lowest while the increase of the population quantity was the smallest. The contents of free amino acids and soluble sugar in cucumber leaves under different nitrogen levels changed obviously. With the increase of nitrogen level, the total amount of 16 kinds of free amino acids increased , The content of soluble sugar decreased. The intrinsic rate of increase of aphids was positively correlated with the increase of free amino acids and the increase of the control, and negatively correlated with the content of soluble sugar, all reaching significant levels. The results showed that different nitrogen levels affected aphid reproduction and population growth by changing the content of free amino acids and soluble sugar in leaves.