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- W2371302331 abstract "In order to understand the impact of increasing woodland plant diversity on degrees of insect pest occurrence,plant diversities of different deposition models for Pinus kesiya var.langbianensis plantations and the occurrence degrees of the three primary pests:Dendrolimus kikuchii,Retinia cristata and Dioryctria rubella were investigated from 2009 to 2010 in Simao County and Jinggu County,Yunnan Province.Plant diversities in different plantations were denoted by Shannon index,and the species evenness were denoted by Pielou index.Insect occurrence degree were denoted by percentage of insect-infesting trees.Results showed that the Shannon index for mixed stands of P.kesiya var.langbianensis versus Schima wallichii,Betula alnoides,Altingia chinensis,or stands of pine mixed with hardwoods was higher than monoculture pine stands.However,tree stands of higher Shannon index dose not necessarily have a higher Pielou indices.The occurrence degrees of the three main insect pests decreased with the increased of Shannon indices.In Qingshuihe of Simao County,the occurrence degree of Dendrolimus kikuchii(y =-29.929x + 70.61,R2 = 0.966 7;y =-14.57 8x + 34.213,R2 = 0.974 9) and Dioryctria rubella(y =-8.872 7x + 20.627,R2 = 0.994 6;y =-8.652 9x + 20.215,R2 = 0.935 1) showed good linear relationship with the Shannon indices of tree layer,whereas that of Retinia crstata showed good linear relationship with the Shannon indices of shrub layer.(y =-5.672 7x + 14.964,R2 = 0.835 8;y =-4.4756x + 12.27,R2 = 0.838 1).In Wenlang of Jinggu County,there were also good linear relationship between occurrence degree of Dendrolimus kikuchii(y =-55.454x + 135.16,R2 = 0.954 1) or Dioryctria rubella(y =-23.895x + 57.907,R2 = 0.983 1) with Shannon index of tree layer.Appropriately increasing tree species diversity in plantations can reduce the incidence of insect pests." @default.
- W2371302331 created "2016-06-24" @default.
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- W2371302331 date "2012-01-01" @default.
- W2371302331 modified "2023-09-24" @default.
- W2371302331 title "Primary insect pest occurrence and tree diversity in stands of Pinus kesiya var. langbianensis" @default.
- W2371302331 hasPublicationYear "2012" @default.
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