大气CO2浓度升高对绿色型豌豆蚜生长发育和繁殖的影响

为了研究大气CO_2浓度升高对绿色型豌豆蚜生长发育和繁殖的影响,应用CO_2人工气候箱,CO_2浓度设置中等浓度(550±27)μL/L]和高浓度(750±37)μL/L],并以当前浓度(375±18)μL/L]为对照,观察并记录了饲养在蚕豆上的连续3代绿色型豌豆蚜的生长发育和繁殖指标。结果表明,随着CO_2浓度升高,连续3代绿色型豌豆蚜发育历期均缩短,初产若蚜体重、成蚜体重、体质量差和相对日均体重增长率均呈增加趋势;各世代的繁殖期延长,平均产蚜量和最大产蚜量均增加;各世代的净增殖率(R0)增大,平均世代周期(T)延长,内禀增长率(rm)和周限增长率(λ)均减小。因此,绿色型豌豆蚜的种群数量随着CO_2浓度升高而下降,故推测未来大气CO_2浓度的升高可能不利于豌豆蚜的发生。

Effects of elevated CO2 on development and reproduction of green pea aphid (Acyrthosiphon pisum)

To study the effect of elevated CO2 on development and reproduction of three consecutive generations of green pea aphid (Acyrthosiphon pisum),the reproductive performance of three consecutive generations of green pea aphid fed detached Vicia faba leaves was recorded under ambient CO2 (375±18) μL/L] and two elevated CO2 concentrations:moderate (550±27) μL/L] and double ambient (750±37) μL/L].It was found that developmental duration of three consecutive generations of green pea aphid was shortened,while larval weight,adult weight,weight difference and mean daily relative growth rate all displayed increasing trends under elevated CO2 conditions.Also,the reproductive period was prolonged,and the average and maximum fecundity of larvae were both increased.Net reproductive rate (R0) of three consecutive generations of green pea aphid was increased and generation time (T) prolonged,while intrinsic rate of increase (rm) and finite rate of increase (λ) were decreased.The population of green pea aphid declined under elevated CO2 conditions.Hence,elevated CO2 may have negative effects on green pea aphid population numbers.