Emission Rates, Survival, and Modeled Dispersal of Viable Pollen of Creeping Bentgrass
2007
Pfender, W. | Graw, R. | Bradley, W. | Carney, M. | Maxwell, L.
Dispersal and deposition of pollen of creeping bentgrass (Agrostis stolonifera L.) was estimated by using CALPUFF, a complex model originally developed to simulate dispersal of particulates and other air pollutants. In field experiments, peak pollen emission rates (8 × 10⁶ pollen grains per min per m² of a creeping bentgrass stand) occurred between 1000 and 1200 h. Pollen survival under outdoor conditions decreased exponentially with time, and only 1% survived for 2 h. CALPUFF simulations showed deposition of 100,000 viable pollen grains per m² at distances of 2 to 3 km from the source field, and deposition of one pollen grain per 10 m² at distances of 4.6 to 6.7 km from the source field. Pattern of simulated deposition varied with weather conditions and, to a lesser extent, source field size. Simulation of dispersal by a small thermal vortex produced deposition of one grain per 10 m² at 15.3 km from the source field. Overall, the deposition modeling results suggest that pollen-mediated gene flow is likely at distances of 2 to 3 km from a source field, and possible at distances up to 15 km.
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