Stand Conditions Associated with Roundheaded Pine Beetle (Coleoptera: Scolytidae) Infestations in Arizona and Utah

Autor:	John A. Anhold, Jose F. Negron, Jill L. Wilson
Rok vydání:	2000
Předmět:	Dendroctonus adjunctus animal structures Ecology fungi food and beverages Sowing Forestry Biology medicine.disease_cause complex mixtures Basal area Stocking Disturbance (ecology) Insect Science Infestation medicine PEST analysis Ecology Evolution Behavior and Systematics Woody plant
Zdroj:	Environmental Entomology. 29:20-27
ISSN:	1938-2936 0046-225X
DOI:	10.1603/0046-225x-29.1.20
Popis:	Stand conditions associated with outbreak populations of the roundheaded pine beetle, Dendroctonus adjunctus Blandford, in ponderosa pine, Pinus ponderosa Dougl. ex Laws., forests were studied in the Pinaleno Mountains, AZ, and the Pine Valley Mountains, UT. Classification tree models to estimate the probability of infestation based on stand attributes were built for both study areas using growth rate and ponderosa pine basal area information. Cross-validation estimates of correct classification were 0.60 for the Pinaleno Mountains and 0.58 and 0.78 for the Pine Valley Mountains. Regression tree and linear regression models to estimate amount of mortality caused by the beetles were also built for both sites using growth rate, ponderosa pine basal area, and trees per hectare information. The occurrence and mortality levels caused by the roundheaded pine beetle are positively related at both the stand and tree scale with reduced growth rates caused by high stocking densities.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::76778acef08d864576be54557336893f https://doi.org/10.1603/0046-225x-29.1.20 Zobrazit plný text záznamu