Tree pollen spectra in the Stockholm region (Sweden), 1973-1980

Abstract

By means of a Burkard Seven Day Recording Volumetric Spore Trap located in central Stockhom, about 20 m above ground level, pollen was sampled between March and August for eight consecutive years (1973-1980). The pollen spectra with special reference to trees, in particular Betula and Pinns, were compared as to amount and distribution of taxa. No co-variation between the two latter genera was noted. Betula showed a ± distinct biennial periodicity. The main pollen season is defined. Betula and Pinus showed slightly different patterns regarding beginning and duration of the pollen season; mean intensity is compared. © 1981 Taylor and Francis Group, LLC.