Urticaceae pollen concentration in the atmosphere of North Western Spain.

Roberto Fraile 1, Rosa Valencia-Barrera 1, Delia Fernandez-Gonzalez 1, Ana Maria Vega-Maray 2
1 -
2 - Departamento de Biologia Vegetal (Botanica), Facultad de Ciencias Biologicasy Ambientales, Universidad de Leon. Campus de Vegazana, 24071 Leon, Spain. dbvavm@unileon.es
Ann Agric Environ Med
2003; 10 (2):
ICID: 142701
Plants of the Urticaceae family can develop into a pest on soils enrichedwith nitrogen. Urticaceae pollen is a biohazard because it elicits severe pollinosis. Pollen grains weresampled by using a Lanzoni seven-day-recording trap from February 1995-December 2000 in the atmosphereof the city of Ponferrada (Leon, North Western Spain). The Spearman test was used to analyse the statisticalcorrelation between Urticaceae pollen and certain meteorological factors in different main pollinationperiods. Maximum values are reached in June and July, minimum levels are recorded in January and December.The parameters bearing the greatest positive influence on the occurrence of Urticaceae pollen grainsare: temperature (maximum, minimum and mean), humidity (absolute, wet-bulb temperature, dew point andmixing ratio) and south western wind direction; negative parameters are: relative humidity, rainfalland period without wind. The highest correlation coefficients were obtained with temperature and wet-bulb.Absolute humidity and wet-bulb temperature yielded better correlation than relative humidity; hence,these two parameters must be included in this type of study. The use of one main pollination period oranother in statistical analysis has an influence on the coefficient value. The behaviour of the pollengrains in the atmosphere during the year also influences the results.
PMID 14677920 - click here to show this article in PubMed

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