Thistle, Harold W.; Shea, P. ; Holsten, E. ; Quilici, D. . 1998. Pheromone Dispersion in the Canopy Trunk Space. 9834 2838. Missoula, MT: U.S. Department of Agriculture, Forest Service, National Technology and Development Program.
Discusses a study to better understand air movement in the forest canopy trunk space so placement of passive pheromone dispensers can be optimized. This work concerns western pine beetle (Dendroctonus brevicomis) that typically fly in temperatures greater than 11 °C during daylight in the warm seasons. This study utilizes sulfur hexafluoride (SF6) as a tracer to study the dispersion patterns in a ponderosa pine (Pinus ponderosa) trunk space in the southern Cascade Range in northern California. Four hundred and fifty, 30-minute samples of SF6 concentration were collected per test day inside of a circle of 30-m radius, resulting in over 3500 samples over 9 test days. Atmospheric conditions ranging from stable through unstable were sampled. Extensive canopy architecture as well as heat and momentum flux data were also collected. Results showed substantially different mixing regimes as a function of stability.
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