Joseph J. OBrien

Contact Info

Southern Research Station
USDA Forest Service
320 Green Street
Athens , GA 30602, United States

Publications in Fire Ecology

Comparing Techniques for Estimating Flame Temperature of Prescribed Fires
Pages: 75-84
DOI: 10.4996/fireecology.0101075

A variety of techniques that estimate temperature and/or heat output during fires are available. We assessed the predictive ability of metal and tile pyrometers, calorimeters of different sizes, and fuel consumption to time-temperature metrics derived from thick and thin thermocouples at 140 points distributed over 9 management-scale burns in a longleaf pine forest in the southeastern US.  [Read More]

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Acute Physiological Stress and Mortality Following Fire in a Long-Unburned Longleaf Pine Ecosystem
Pages: 1-12
DOI: 10.4996/fireecology.0602001

One important legacy of fire exclusion in ecosystems dependent upon frequent fire is the development of organic soil horizons (forest floor) that can be colonized by fine roots. When fire is re-introduced, the forest floor is often consumed by fire and heavy overstory mortality, often delayed by months, results. We hypothesized that the delayed post-fire tree mortality is a manifestation of a cascade of physiological stresses initiated by root damage that can also magnify the impact of other kinds of damage. We investigated the physiological impact of forest floor consumption on longleaf pines (Pinus palustris Mill.) subjected to a wildfire in 2005 in a long-unburned (> 50 years) forest by measuring forest floor consumption, whole tree water use, and leaf chlorophyll content.  [Read More]

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