The effect of shelterbelt poplar on predatory natural enemies in corn fields
[Objective]This study aimed to find out effects of shelterbelt poplar on predatory natural enemies in corn field and its role in providing migration and survival of natural enemies.[Method]Effects of shelterbelts on the habitat distribution and population dynamics of major predatory natural enemies(Ladybirds and chrysoptera)were analyzed by means of mathematical statistics through field survey before and after the insecticide application and harvest.[Result]The relation between the number distribution of Ladybirds in corn fields and the distances from the forest was positively correlated,while the relation between the number distribution of Lacewings in corn fields and the distances from the forest was negatively correlated,and the correlation with Lacewings(chrysoptera)was significant(the correlation index is-0.917,P<0.05);the number distribution of predators in the forest at different distances from the corn field was also uneven;the number of ladybirds in the forest belt near the corn field was 3 times higher than that of lacewings,while the number of lacewings in the center forest belt was 2.5 times higher than that of ladybirds.[Conclusion]Under the influence of pesticide spraying and harvesting,shelterbelt poplar became an important habitat and transition site for natural enemies of ladybugs and chrysoplebons,which could shorten the time for the restoration and reconstruction of the natural enemy communities in farmland and provide population reservoir.Therefore,this played an important role in the ecological control of pest populations in farmland.
国家科技期刊平台
NSTL
万方数据
