Tree-ring reconstruction of western spruce budworm outbreaks in the Rio Grande National Forest, Colorado

Persistent Link:
http://hdl.handle.net/10150/278715
Title:
Tree-ring reconstruction of western spruce budworm outbreaks in the Rio Grande National Forest, Colorado
Author:
Ryerson, Daniel Eric
Issue Date:
1999
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Tree-ring records were used to reconstruct the spatial and temporal patterns of western spruce budworm (Choristoneura occidentalis Freeman) outbreaks in the Rio Grande National Forest (RGNF) of southern Colorado. Reconstructions at 11 host stands showed a synchronous pattern of outbreaks with a peak in the number of trees recording outbreaks over the entire RGNF on average every 24 years. These synchronous periods of outbreaks coincided with periods of increased moisture as indicated by an independently reconstructed summer Palmer Drought Severity Index, while relatively few trees recorded outbreaks during dry periods. The reconstruction on the RGNF does not support the hypothesis that human land use has significantly altered outbreak patterns. Tree response to outbreaks in the RGNF was different from prior studies as reductions in growth were typically detectable only when growth was compared to that of nonhost tree species.
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Biology, Ecology.; Biology, Entomology.; Agriculture, Forestry and Wildlife.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College; Renewable natural resources
Degree Grantor:
University of Arizona
Advisor:
Swetnam, Thomas W.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleTree-ring reconstruction of western spruce budworm outbreaks in the Rio Grande National Forest, Coloradoen_US
dc.creatorRyerson, Daniel Ericen_US
dc.contributor.authorRyerson, Daniel Ericen_US
dc.date.issued1999en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractTree-ring records were used to reconstruct the spatial and temporal patterns of western spruce budworm (Choristoneura occidentalis Freeman) outbreaks in the Rio Grande National Forest (RGNF) of southern Colorado. Reconstructions at 11 host stands showed a synchronous pattern of outbreaks with a peak in the number of trees recording outbreaks over the entire RGNF on average every 24 years. These synchronous periods of outbreaks coincided with periods of increased moisture as indicated by an independently reconstructed summer Palmer Drought Severity Index, while relatively few trees recorded outbreaks during dry periods. The reconstruction on the RGNF does not support the hypothesis that human land use has significantly altered outbreak patterns. Tree response to outbreaks in the RGNF was different from prior studies as reductions in growth were typically detectable only when growth was compared to that of nonhost tree species.en_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
dc.subjectBiology, Ecology.en_US
dc.subjectBiology, Entomology.en_US
dc.subjectAgriculture, Forestry and Wildlife.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineRenewable natural resourcesen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorSwetnam, Thomas W.en_US
dc.identifier.proquest1398039en_US
dc.identifier.bibrecord.b40274792en_US
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