【摘要】 在腾格里沙漠东南缘荒漠草原区研究了昆虫寄生对柠条种子命运的影响,结果表明:①种子库的虫寄生率高达69.7%,寄生性昆虫为柠条豆象(Kytorrhinus immxitusMotschulsky),柠条坚荚螟(Etiella zinckenellaTreitschke),柠条种子小蜂(Bruchophagus neocaragaeLiao),刺槐种子小蜂(Bruchophagus philorobinaeSphov);②整个种子库的发芽率为38.35%,无虫寄生的种子的发芽率为88.6%,柠条豆象寄生完全阻断种子的发芽率;种子小蜂类和柠条坚荚螟取食寄生的种子发芽率分别为19.2%和5.3%。③完好的种子和不同昆虫寄生的种子之间长度、宽度和重量之间有显著的差异。和正常种子相比较,柠条豆象寄生引起种子体积增大;柠条坚荚螟和种子小蜂寄生均使种子体积减小;柠条豆象、柠条坚荚螟和种子小蜂寄生引起种子的重量损耗分别为57.64%,49.13%和39.30%。结果证明昆虫寄生对种子的命运有重要影响,是影响种群更新的关键因素之一。更多还原

【Abstract】 Insect infestation and its effects on seed fate of Caragana korshinskii Kom were studied in southeast edge of the Tengger Desert in 2004.The results indicate that the seed germination rate is significantly affected by insect infestation.The insect-infested seeds show a lower germination rate than that of non-infested or die rapidly even after germination.On the average,69.7% of the total seeds are infested by insects,which is mainly involved with Kytorrhinus immxitus Motschulsky,Bruchophagus neocaragae Liao,Brchophagus philorobinae Sphov,and Etiella zinckenella Treitschke.The development and growth of seeds can also be effected by the insect parasitism through its size swelled by Kytorrhinus immxitus Motschulsky or shrunk by Etiella zinckenella Treitschke,Bruchophagus neocaragae Liao,and Bruchophagus philorobinae Sphov.Comparing with non-infested seeds,57.64% loss in weight is caused by Kytorrhinus immxitus, Etiella zinckenella and Bruchophagus sp.accounts for 49.13%,39.30% and 39.30%,respectively.Based on this study,it can be concluded that insect infestation is one of the main factors for regeneration of Caragana korshinskii through its effects on seeds fate.更多还原