Fire History of Montane Grasslands and Ecotones of the Valles Caldera, New Mexico, USA

Persistent Link:
http://hdl.handle.net/10150/216950
Title:
Fire History of Montane Grasslands and Ecotones of the Valles Caldera, New Mexico, USA
Author:
Dewar, Jacqueline Joy
Issue Date:
2011
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.
Embargo:
Embargo: Release after 07/09/2012
Abstract:
We reconstructed historical fire regimes of montane forest-grassland ecotones in the ~40,000 ha Valles Caldera National Preserve, New Mexico. We used a targeted approach to sample ancient fire-scarred trees along the ecotone, and compared variations in historical fire occurrence within and among valles in the grassland-forest. The resulting tree-ring record extends from 1240-2008 C.E., comprised of 2,443 fire scars from 330 trees representing 238 fire years during the period of analysis, 1601-1902 C.E. Our results confirm pre-1900 historical occurrence of high-frequency, low-severity surface fires over multiple centuries in the ecotone. Mean fire intervals for all fires were 5.5-22.5 years (~6-123 ha) at individual sites, 2.7-10 years (~67-4955 ha) in individual valles, and 1.6 years (~10 386 ha) across the landscape. Synchronous fires burned extensively and occurred at ~10 year intervals during years with significantly low PDSI. Results will be useful in planning forest/grassland restoration actions and reinstituting fire regimes.
Type:
text; Electronic Thesis
Keywords:
Fire history; Fire regime; Montane grasslands; Spatial analysis; Natural Resources; Dendrochronology; Ecotone
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College; Natural Resources
Degree Grantor:
University of Arizona
Advisor:
Falk, Donald A.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleFire History of Montane Grasslands and Ecotones of the Valles Caldera, New Mexico, USAen_US
dc.creatorDewar, Jacqueline Joyen_US
dc.contributor.authorDewar, Jacqueline Joyen_US
dc.date.issued2011-
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.releaseEmbargo: Release after 07/09/2012en_US
dc.description.abstractWe reconstructed historical fire regimes of montane forest-grassland ecotones in the ~40,000 ha Valles Caldera National Preserve, New Mexico. We used a targeted approach to sample ancient fire-scarred trees along the ecotone, and compared variations in historical fire occurrence within and among valles in the grassland-forest. The resulting tree-ring record extends from 1240-2008 C.E., comprised of 2,443 fire scars from 330 trees representing 238 fire years during the period of analysis, 1601-1902 C.E. Our results confirm pre-1900 historical occurrence of high-frequency, low-severity surface fires over multiple centuries in the ecotone. Mean fire intervals for all fires were 5.5-22.5 years (~6-123 ha) at individual sites, 2.7-10 years (~67-4955 ha) in individual valles, and 1.6 years (~10 386 ha) across the landscape. Synchronous fires burned extensively and occurred at ~10 year intervals during years with significantly low PDSI. Results will be useful in planning forest/grassland restoration actions and reinstituting fire regimes.en_US
dc.typetexten_US
dc.typeElectronic Thesisen_US
dc.subjectFire historyen_US
dc.subjectFire regimeen_US
dc.subjectMontane grasslandsen_US
dc.subjectSpatial analysisen_US
dc.subjectNatural Resourcesen_US
dc.subjectDendrochronologyen_US
dc.subjectEcotoneen_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineNatural Resourcesen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorFalk, Donald A.en_US
dc.contributor.committeememberSwetnam, Thomas W.en_US
dc.contributor.committeememberAllen, Craig D.en_US
dc.contributor.committeememberFalk, Donald A.en_US
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