Analysis of Key Factors Affecting the Occurrence Degree of Agrilus planipennis Fairmaire in Xinjiang
[Objective]To clarify the key impact factors of the occurrence degree of Agrilus planipennis Fair-maire(emerald ash borer,EAB)and reduce the risk of further spread in Xinjiang.[Methods]"Five-spot"sample method was used to survey the occurrence degree of EAB and the stand characteristics in these samples,host plant bark structure were determined and environmental factors were recorded.Principal component analysis was used to clarify the key factors affecting EAB occurrence degree,and one-way ANOVA was used to analysis the effect of the impact factors on the population density of EAB.In addition,stepwise regression analysis was used to develop multiple regression models to verify the relationship between the occurrence degree of EAB and impact factors.[Results]The results showed that the host species was the key impact factor which affected the occurrence degree of EAB mostly,followed by tree species composition,bark crevice depth and cambium thickness.The population density of EAB on Fraxinus americana Linn.(13.92±1.50)was higher than that on Fraxinus sogdiana Bunge(4.76±0.76)(P≤0.001),and the population density of EAB on pure stand(11.51±1.66)was significantly higher than that of mixed stand(6.53±1.33)(P=0.037).On the same host plant,the population density of EAB was positively related to the bark fissure depth(F.sogdiana:P≤0.001;F.americana:P≤0.001)and cambium thickness(F.sogdiana:P≤0.001;F.americana:P≤0.001).The population density of EAB didn't show sig-nificant difference between the phloem thickness of the same host species(F.sogdiana:P=0.593;F.americana.:P=0.126),but which was significantly different between the same phloem thickness of differ-ent host species.[Conclusion]The key factor which affects the occurrence of EAB is the host species,bark fissure depth and cambium thickness significantly affect the population density of EAB.Adjusting the composition of host species can effectively reduce the damage and spread of EAB.
Agrilus planipennis Fairmaireoccurrence degreepopulation densitykey impact factorshost species
万方数据
维普
