Search Results - "North, Malcolm"

A Convolutional Neural Network Classifier Identifies Tree Species in Mixed-Conifer Forest from Hyperspectral Imagery by Fricker, Geoffrey A., Ventura, Jonathan D., Wolf, Jeffrey A., North, Malcolm P., Davis, Frank W., Franklin, Janet

“…In this study, we automate tree species classification and mapping using field-based training data, high spatial resolution airborne hyperspectral imagery, and…”
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Cross-scale interaction of host tree size and climatic water deficit governs bark beetle-induced tree mortality by Koontz, Michael J., Latimer, Andrew M., Mortenson, Leif A., Fettig, Christopher J., North, Malcolm P.

“…The recent Californian hot drought (2012–2016) precipitated unprecedented ponderosa pine ( Pinus ponderosa ) mortality, largely attributable to the western…”
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Operational resilience in western US frequent-fire forests by North, Malcolm P., Tompkins, Ryan E., Bernal, Alexis A., Collins, Brandon M., Stephens, Scott L., York, Robert A.

“…•With changing climate, resilience has become a management objective but is difficult to quantify.•Minimal competition supports vigorous tree growth which may…”
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Local forest structure variability increases resilience to wildfire in dry western U.S. coniferous forests by Koontz, Michael J., North, Malcolm P., Werner, Chhaya M., Fick, Stephen E., Latimer, Andrew M., Swenson, Nathan

“…A ‘resilient’ forest endures disturbance and is likely to persist. Resilience to wildfire may arise from feedback between fire behaviour and forest structure…”
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Changing spatial patterns of stand-replacing fire in California conifer forests by Stevens, Jens T., Collins, Brandon M., Miller, Jay D., North, Malcolm P., Stephens, Scott L.

“…•A novel metric for analyzing spatial pattern in stand-replacing fire is analyzed.•Stand-replacing patches have become larger and more regularly-shaped over…”
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Severity of an uncharacteristically large wildfire, the Rim Fire, in forests with relatively restored frequent fire regimes by Lydersen, Jamie M., North, Malcolm P., Collins, Brandon M.

“…•Pre-fire field data was used to assess Rim Fire severity in frequent-fire forests.•Regardless of forest conditions, plume-dominated fire burned at higher…”
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Using Fire to Increase the Scale, Benefits, and Future Maintenance of Fuels Treatments by North, Malcolm, Collins, Brandon M, Stephens, Scott

“…The USDA Forest Service is implementing a new planning rule and starting to revise forest plans for many of the 155 National Forests. In forests that…”
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Variable thinning and prescribed fire influence tree mortality and growth during and after a severe drought by Knapp, Eric E., Bernal, Alexis A., Kane, Jeffrey M., Fettig, Christopher J., North, Malcolm P.

“…•Forest thinning substantially reduced drought-related bark beetle mortality.•Variable thinning did not increase mortality relative to a more standard…”
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Efficacy of variable density thinning and prescribed fire for restoring forest heterogeneity to mixed-conifer forest in the central Sierra Nevada, CA by Knapp, Eric E., Lydersen, Jamie M., North, Malcolm P., Collins, Brandon M.

“…•Structural attributes were compared among forests treated with thinning and/or prescribed fire.•High variability thinning was designed to restore structural…”
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Climate‐Driven Tree Mortality and Fuel Aridity Increase Wildfire's Potential Heat Flux by Goodwin, Marissa J., Zald, Harold S. J., North, Malcolm P., Hurteau, Matthew D.

“…Wildfire is capable of rapidly releasing the energy stored in forests, with the amount of water in live and dead biomass acting as a regulator on the amount…”
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Tree growth responses to extreme drought after mechanical thinning and prescribed fire in a Sierra Nevada mixed-conifer forest, USA by Zald, Harold S.J., Callahan, Chance C., Hurteau, Matthew D., Goodwin, Marissa J., North, Malcolm P.

“…•Drought-induced tree mortality highlights need for climate mitigation treatments.•Thinning resulted in durable increases in tree growth, even during extreme…”
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Live fast, die young: Climate shifts may favor Great Basin bristlecone pine or limber pine in sub-alpine forest establishment by Smithers, Brian V., Alongi, Franklin, North, Malcolm P.

“…•Limber pine experienced greater height and diameter growth rates on average.•Great Basin bristlecone pine experienced greater overall survival on…”
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Growth and spatial patterns of natural regeneration in Sierra Nevada mixed-conifer forests with a restored fire regime by Fertel, Hannah M., North, Malcolm P., Latimer, Andrew M., Ng, Jan

“…•Forests with a restored fire regime had high natural regeneration rates.•Regardless of species, the majority of sampled stems, were found in clumps.•Young…”
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Mechanisms of species range shift: germination and early survival of Great Basin bristlecone pine and limber pine by Smithers, Brian V., North, Malcolm P.

“…Aims To examine the potential mechanistic predictors of germination and first-year survival in two species of Great Basin sub-alpine trees along an elevation…”
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Forest structure and pattern vary by climate and landform across active-fire landscapes in the montane Sierra Nevada by Jeronimo, Sean M.A., Kane, Van R., Churchill, Derek J., Lutz, James A., North, Malcolm P., Asner, Gregory P., Franklin, Jerry F.

“…•There are 30,379 ha of restored active-fire forest in the Sierra Nevada.•Eighty-one percent of active-fire forests are in National Parks.•Variation in…”
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Managing fire‐prone forests in a time of decreasing carbon carrying capacity by Hurteau, Matthew D, Goodwin, Marissa J, Marsh, Christopher, Zald, Harold SJ, Collins, Brandon, Meyer, Marc, North, Malcolm P

“…Changing climatic conditions are increasing overstory tree mortality in forests globally. This restructuring of the distribution of biomass is making already…”
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Quantifying spatial patterns of tree groups and gaps in mixed-conifer forests: Reference conditions and long-term changes following fire suppression and logging by Lydersen, Jamie M., North, Malcolm P., Knapp, Eric E., Collins, Brandon M.

“…•We assess changes in forest spatial structure following fire exclusion and logging.•The historical forest had greater structural heterogeneity.•The…”
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Mixed severity fire effects within the Rim fire: Relative importance of local climate, fire weather, topography, and forest structure by Kane, Van R., Cansler, C. Alina, Povak, Nicholas A., Kane, Jonathan T., McGaughey, Robert J., Lutz, James A., Churchill, Derek J., North, Malcolm P.

“…•Examined importance of controls on mixed-severity burn patterns.•Biophysical environment and fire history best explained burn severity patterns.•Spatial…”
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Leap frog in slow motion: Divergent responses of tree species and life stages to climatic warming in Great Basin subalpine forests by Smithers, Brian V., North, Malcolm P., Millar, Constance I., Latimer, Andrew M.

“…In response to climate warming, subalpine treelines are expected to move up in elevation since treelines are generally controlled by growing season…”
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Changing climate reallocates the carbon debt of frequent‐fire forests by Goodwin, Marissa J., North, Malcolm P., Zald, Harold S. J., Hurteau, Matthew D.

“…Ongoing climate change will alter the carbon carrying capacity of forests as they adjust to climatic extremes and changing disturbance regimes. In…”
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