不同施氮量条件下柑橘粉虱自然种群生命表的研究

Study on life table of natural population of Dialeurodes citri under different nitrogen quantities

系统调查柑橘粉虱在每百棵柑橘不同氮肥量N1(对照),N2(施氮肥0.25kg),N3(施氮肥0.50kg),N4(施氮肥0.75kg)条件下的自然种群,以作用因子组建在不同氮肥条件下的自然种群生命表。结果表明:不同氮肥水平下的柑橘树对柑橘粉虱的自然种群增长有着一定的影响,其中N3处理下的各作用因子作用一直处于相对稳定和较高的水平,其种群趋势指数为29.8,和施氮水平N2下的28.5很接近,明显低于施氮水平N4下的39.2,比N4水平下造成爆发成灾的可能性小,说明通过调节施氮量可控制柑橘粉虱的种群数量。

Based on an investigation of natural population dynamics of Dialeurodes citri in citrus treated with different nitrogen quantities for 100 trees [N1 （ck）, N2 （0. 25 kg nitrogen）, N3 （0. 50 kg nitrogen）, N4 （0. 75 kg nitrogen） ], the natural life table of this pest was formulated including the rey effecting factors. The results showed that the quantities of nitrogen influenced on the natural population of D. citri. The index of population trend under the treatment of N3 was similar with that under N2, with the value of 29.8 and 28.5, but lower than the index of population trend of N4, with the value of 39.2. This indicated the possibility of controlling the population of D. citri by adjusting the nitrogen supply for the citrus tree.