Diurnal variation of tree pollen in the air in finland
TLDR
In this paper, the Burkard spore traps in Turku and Jyvaskyla, in southern and central Finland, were used to collect the pollen and analyzed the results for hour to hour concentrations.Abstract:
The pollen was collected with Burkard spore traps in Turku and Jyvaskyla, in southern and central Finland. Selected days of high concentration were analysed for hour to hour concentrations. The diurnal variation of pollen concentration was variable in Alnus, Betula, Juniperus and Pinus, while Picea, Populus, Quercus, Salix and Ulmus had regular daytime maxima och nightly minima. The pollen concentrations were closely correlated with increasing temperatures and decreasing relative humidities. A significant relationship with wind speed was also found, except in Alnuts and Betula. The most significant relationships with wind speed were found in Salix and Quercus, the pollen of which tends to remain in lumps. Generally, the bigger the pollen grains are, the more their concentrations are dependent on wind speed. Pinus and Picea seem to have a threshold wind speed about 4 m/s above which concentrations become higher.read more
Citations
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Acclimation and adaptive responses of woody plants to environmental stresses
TL;DR: The predominant emphasis on harmful effects of environmental stresses on growth of woody plants has obscured some very beneficial effects of such stresses, including physiological adjustment that protects plants from the growth inhibition and/or injury that follow when environmental stresses are abruptly imposed.
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The effects of meteorological factors on atmospheric bioaerosol concentrations--a review.
Alan M. Jones,Roy M. Harrison +1 more
TL;DR: Measurements of the concentrations of airborne material near dominant sources are reviewed for both area sources, and for point sources such as sewage and waste treatment works, agricultural practices, and diseased animals.
Journal ArticleDOI
Theoretical daily variation patterns of airborne pollen in the southwest of spain
TL;DR: This work establishes theoretical daily pollen variation grains for the 24 taxa most frequently occurring in the atmosphere of Cordoba (Spain) during three consecutive years using a Burkard spore-trap to establish theoretical patterns of daily variation represented by an ideal day.
Journal ArticleDOI
Airborne Pollen Records in Denmark, 1977–1986
Journal ArticleDOI
Diurnal variation of pollen concentration in the air of north-central london
Jane Norris-Hill,Jean Emberlin +1 more
TL;DR: Pollen concentrations recorded during three years sampling in north-central London have shown distinctive diurnal variations for three pollen taxa and a hypothesis of pollen dispersal to the sampling site is suggested.
References
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Journal ArticleDOI
An automatic volumetric spore trap
TL;DR: Estimates of spore content of the air can be made, with higher efficiency than by previous traps, at different times of day and thus be more closely correlated with variations in weather.
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An evaluation of the microscopical counting methods of the tape in hirst-burkard pollen and spore trap
Markku Käpylä,Antti Penttinen +1 more
TL;DR: Three different sampling units in current use and different sampling strategies were tested and it is not safe to choose an “effectively collecting area”, instead the whole width of the tape should be studied.
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Untersuchungen über die Verbreitung des Blütenstaubes durch die Luftströmungen
TL;DR: Eine bessere Kenntnis der Verbreitung des Blfitenstaubes durch den Wind erscheint heute yon verschiedenen Gesiehtspunkten aus recht ~4inschenswert.