LOWER PLANETARY BOUNDARY-LAYER PROFILES OF ATMOSPHERIC CONIFER POLLENABOVE A SEED ORCHARD IN NORTHERN ONTARIO, CANADA

Atmospheric concentration profiles of pollen from jack pine (Pinus ban ksiana Lamb.) and black spruce (Picea mariana (Mill.) B.S.P.) were mea sured up to 300 m above ground level at the edge of a seed orchard in northern Ontario, Canada. Large amounts of pollen were found up to 300 m showing the occurrence of meso-scale transport of coniferous pollen and also possible long distance transport. The profile shapes were fo und to be a function of source characteristics and meteorological cond itions. Changes in profile shape were in general agreement to those fo und in previous work. If meso- or synoptic-scale transport of conifer pollen occurs, then the use of isolation zones would not be useful to stop this component of the contaminant pollen cloud entering a seed or chard, especially if pollen longevity in the atmosphere is long. Howev er, further work is required to determine if this component of the con tamination pollen cloud is large and whether or not the pollen is viab le.