Birch pollen production,transport and deposition for the period 1984–1993 at Kevo,northernmost Finland |
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Authors: | Sheila Hicks Marjo Helander Saini Heino |
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Institution: | (1) Department of Geology, University of Oulu, Linnanmaa, FIN-90570 Oulu, Finland;(2) Department of Biology, University of Turku, FIN-20500 Turku, Finland;(3) Kevo Subarctic Research Institute, University of Turku, FIN-20500 Turku, Finland |
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Abstract: | Summary
Betula pollen production and flowering, pollen transport and pollen deposition are considered for the mountain birch region of northern
Finland for the ten-year period 1984–1993. The most abundant flowering year was 1989 and, after that, 1985. In these years
the highest values were also recorded for pollen in the air. There is a significant correlation between the amount of pollen
released and the thermal sum of the previous year. In terms of pollen deposition the peak years were 1989 and 1986. The correlation
between the amount of pollen in the air and that being deposited on the ground is also statisticaly significant. It is evident
that some birch pollen is already present in the air before local flowering begins and that, in some years, this non-local
pollen can account for more than 20% of the yearly total. This preflowering proportion was highest in 1985 and 1993, the latter
being a prolific flowering year in the south of the country. There is a clear relationship between the proportion of the non-local
pollen in the air and the proportion ofBetula pubescens/pendula type pollen deposited on the ground and, conversely, there is a significant correlation between the amount of local pollen
in the air and the amount ofBetula tortuosa plusB. nana type pollen being deposited on the ground. The questions both of the viability of this long-distance pollen and of its ability
to cause allergic reactions are considered. An assessment is also made of the degree to which fossil birch pollen assemblages
can be realistically interpreted in terms of local vegetation if a varying proportion of the same pollen type is non-local. |
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Keywords: | Birch pollen pollen production pollen transport pollen deposition Finland |
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