A Tracer Investigation of Pheromone Dispersion in Lodgepole and Ponderosa Pine Forest CanopiesVolume 16, No. 4, 2010 • Manuscript
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Environmental science, environment, USDA Forest Service, University of Montana, Missoula, mountain pine beetle, dendroctonus, Montana Tech of the University of Montana, Botany, dispersion, Environmental Engineering Department, pheromones, pheromone dispersion, tracer experiments, forest canopy, Plant Ecology, government agencies, plume, wind speed, forest service, tracer investigation pheromone dispersion, ponderosa pine forest canopies, average plume spread, bark beetles, dispersion coefficients, lodgepole pine forest canopies
Tracer experiments were conducted in 2000 and 2001 to study spread of insect pheromone plumes in forest canopies. The field sites consisted of lodgepole pine (Pinus contorta) and ponderosa pine (P. ponderosa) canopies in 2000 and 2001, respectively. Ranges of temperature, wind speed, and turbulence conditions were similar in the two campaigns, and field data showed comparable variability on near-instantaneous time scales of wind speed, wind direction, and plume behavior. We developed simple empirical equations to estimate average horizontal and vertical plume spread as functions of standard turbulence statistics, downwind distance from the source, and wind speed. For horizontal plume spread, predicted dispersion coefficients were within a factor of 3, or better, for 97 percent of the observed values in the combined dataset from 2000 and 2001. Likewise, 99 percent of the predicted vertical dispersion coefficients were within a factor of 3 of the observed data.
This material is based upon work supported by the U. S. Department of Agriculture under Award No. 02-DG-11244225 and USDA-FS FHP/ FHTET TD.00.03.
Peterson, M. E., Peterson, H. G., Thistle, H. W., Lamb, B. K., Allwine, G., Strand, T., A 2010. Tracer Investigation of Pheromone Dispersion in Lodgepole and Ponderosa Pine Forest Canopies. Intermountain Journal of Sciences 16(4): 61-72.