Aerobiological investigation in Bitlis, Turkey.

A continuous aeropalynological survey of the atmosphere of Bitlis was carried out from January 2001 to December 2002 by means of the gravimetric method using Durham apparatus. Weekly pollen grains in per cm(2) were calculated. During two years, a total of 3,323 pollen grains/cm(2) which belong to 46 taxa, 21 of total belong to arboreal (AP) and 25 of total non-arboreal (NAP) plants, and unidentified pollen grains were recorded. In 2001, 1,833 pollen grains and in 2002, 1,490 pollen grains were recorded. Total pollen grains consist of 39.39 % AP, 59.28 % NAP plants and 1.32 % unidentified pollen grains. Gramineae, Urticaceae, Juglans spp., Quercus spp., Umbellifereae, Cupressaceae/Taxaceae, Fraxinus spp., Salix spp., Plantago spp., Pinus spp., Rumex spp., Moraceae and Chenopodiaceae/Amaranthaceae were responsible for the greatest amounts of pollens in the investigated region. 58.38 % of total pollen grains were appeared during May and June.