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Forest Science Database

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Abstract

Dry mixed-conifer forests are widespread in the interior Pacific Northwest, but their historical fire regimes are poorly characterized, in particular the relative mix of low- and high-severity fire. We reconstructed a multi-century history of fire from tree rings in dry mixed-conifer forests in...

Author(s)
Heyerdahl, E. K.; Loehman, R. A.; Falk, D. A.
Publisher
NRC Research Press, Ottawa, Canada
Citation
Canadian Journal of Forest Research, 2019, 49, 1, pp 76-86
Abstract

Concern over the effects of removing fire-scarred partial cross-sections may limit sampling of live ponderosa pine to reconstruct fire history. We report mortality rates for ponderosa pine trees 20 to 21 years after removing fire-scarred partial cross-sections to reconstruct fire history. In 2015,...

Author(s)
Heyerdahl, E. K.; McKay, S. J.
Publisher
Laboratory of Tree-Ring Research, University of Arizona, Tucson, USA
Citation
Tree-Ring Research, 2017, 73, 2, pp 149-153
Abstract

We reconstruct pandora moth (Coloradia pandora Blake) outbreaks and climate from a 1572-year (435-2006 CE) ponderosa pine (Pinus ponderosa Dougl. ex Laws.) chronology from a lava flow in central Oregon. We took samples from 128 living trees and remnant logs and crossdated the samples using skeleton ...

Author(s)
Clark, P. W.; Speer, J. H.; Winship, L. J.
Publisher
Laboratory of Tree-Ring Research, University of Arizona, Tucson, USA
Citation
Tree-Ring Research, 2017, 73, 2, pp 113-125
Abstract

Our objective is to report mortality rates for ponderosa pine trees in Oregon ten to eleven years after removing a fire-scarred partial cross-section from them, and five years after an initial survey of post-sampling mortality. We surveyed 138 live trees from which we removed fire-scarred partial...

Author(s)
Heyerdahl, E. K.; McKay, S. J.
Publisher
Laboratory of Tree-Ring Research, University of Arizona, Tucson, USA
Citation
Tree-Ring Research, 2008, 64, 1, pp 61-64
Abstract

There are two broad approaches to quantifying landscape C dynamics - by measuring changes in C stocks over time, or by measuring fluxes of C directly. However, these data may be patchy, and have gaps or biases. An alternative approach to generating C budgets has been to use process-based models,...

Author(s)
Williams, M.; Schwarz, P. A.; Law, B. E.; Irvine, J.; Kurpius, M. R.
Publisher
Blackwell Publishing, Oxford, UK
Citation
Global Change Biology, 2005, 11, 1, pp 89-105
Abstract

Anticipating the consequences of climatic change for fire requires understanding of the causes of variation in historical fire regimes. We assessed the influence of annual and decadal variation in climate on fire regimes of ponderosa pine-dominated forests in eastern Oregon and Washington using...

Author(s)
Heyerdahl, E. K.; Brubaker, L. B.; Agee, J. K.
Publisher
Arnold, London, UK
Citation
Holocene, 2002, 12, 5, pp 597-604
Abstract

Episodic outbreaks of pandora moth (Coloradia pandora Blake), a forest insect that defoliates ponderosa pine (Pinus ponderosa Dougl. ex Laws.) and other pine species in the western United States, have recurred several times during the 20th century in forests of south-central Oregon. We collected...

Author(s)
Speer, J. H.; Swetnam, T. W.; Wickman, B. E.; Youngblood, A.
Publisher
Ecological Society of America, Washington, USA
Citation
Ecology, 2001, 82, 3, pp 679-697
Abstract

Our objective was to infer the controls of spatial variation in historical fire regimes. We reconstructed a multicentury history of fire frequency, size, season, and severity from fire scars and establishment dates of 1426 trees sampled on grids in four watersheds (∼64 plots, over ∼1620 ha each)...

Author(s)
Heyerdahl, E. K.; Brubaker, L. B.; Agee, J. K.
Publisher
Ecological Society of America, Washington, USA
Citation
Ecology, 2001, 82, 3, pp 660-678
Abstract

The recent expansion of juniper into sagebrush steppe communities throughout the semiarid Intermountain West of the USA is most frequently attributed to the reduced role of fire, introduction and overstocking of domestic livestock in the late 1800s, and mild and wet climate around the turn of the...

Author(s)
Miller, R. F.; Rose, J. A.
Citation
Journal of Range Management, 1999, 52, 6, pp 550-559
Abstract

In a study to validate the use of increment cores for dating scarred trees as part of fire-history studies, 37 scarred conifers from four sites in California, Wyoming and Oregon were sampled both by coring and wedging (removing a partial cross section from the scar). For each tree the cores and...

Author(s)
Sheppard, P. R.; Means, J. E.; Lassoie, J. P.
Citation
Forest Science, 1988, 34, 3, pp 781-789

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