摘要
【背景】莲草直胸跳甲是外来入侵杂草空心莲子草的专一性天敌,其田间种群密度直接影响对空心莲子草的控制效果。研究莲草直胸跳甲的种群动态和扩散速度对于适时和适量投放莲草直胸跳甲防治空心莲子草具有重要意义。【方法】2008年5月底,在湿地环境的空心莲子草上释放不同密度的莲草直胸跳甲后,对其进行了持续至12月的种群动态调查。【结果】莲草直胸跳甲种群在6～7月和10～11月分别出现2个明显的高峰期。在湿地、旱地和水田3种生境的空心莲子草上释放莲草直胸跳甲后的扩散动态调查表明,莲草直胸跳甲在旱地的扩散能力强于湿地和水田,放虫后18d,距释放中心点6m处,旱地生境的种群数目大于湿地生境和水田生境。【结论与意义】应用莲草直胸跳甲防治空心莲子草的释放适期为早春5～6月,在不同生境进行释放时,需根据其扩散能力确定适宜的释放点密度和释放量。
[Background]The flea beetle,Agasicles hygrophila,is an introduced natural enemy of alligator weed Alternanthera philoxeroides.The population density of A.hygrophila would effect the control effect on the alligator weed.It＇s important to determine the population dynamics and dispersal rate of A.hygrophila when making feasible release strategy for the control A.philoxeroides.[Method]In this study,we released A.hygrophila at different densities in a marsh land in May and investigated their population dynamics from then on till December 2008.[Result]There were two obvious seasonal activity peaks during June～July and October～November,The value of these peaks was positively correlated with the initial releasing densities.Eighteen days after release,A.hygrophila density at 6 m distance away from the release site in dry land was higher than in either marsh land or in paddy land.[Conclusion and significance]The best release period for A.hygrophila was from May to June in early spring and the suitable release strategy,including release site density and population density should be determined based on its dispersal ability at different environmental conditions.
出处
《生物安全学报》
2011年第4期275-280,共6页
Journal of biosafety
基金
国家"973"计划项目(2009CB119206)
国家"十一五"科技支撑计划项目(2006BAD08A18)
关键词
莲草直胸跳甲
密度
种群动态
扩散
Agasicles hygrophila
density
population dynamics
dispersal
