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Association between local airborne tree pollen composition and surrounding land cover across different spatial scales in Northern Belgium
Journal Contribution - Journal Article
Airborne pollen are important aeroallergens affecting human health. Local airborne pollen compositions can posehealth-risks for the sensitized population, but at present little is known about fine-scale pollen compositionpatterns.The overall objective of this study is to determine local variations in tree pollen composition with passivesamplers and to identify the surrounding landscape characteristics that drive them. In February–May 2017,during the tree pollen season, airborne tree pollen were measured by passive sampling at 2 m height aboveground-level in 14 sites in the Flanders and Brussels-Capital region (Belgium). Non-metric multidimensionalscaling was used to investigate environmental gradients that determine the pollen composition and amounts.Land cover types were identified across spatial scales ranging between 20 m and 5 km.The passive samplers detected the same pollen taxa during the same time windows as the validated volumetricBurkard samplers. Using passive samplers, we were able to measure local airborne pollen compositions. Corylusand Platanus pollen were associated to urban areas; Populus, Juglans and Fraxinus pollen to agricultural areas;forests and wetlands were sources of Alnus and Quercus pollen. Salix, Populus and Betula pollen were also mainlyassociated to wetlands. The landscape context drives the airborne tree pollen composition at a meso-scale (1 5km) rather than at finer scale (20 500 m). Thus, land cover types (e.g. forest, bush land, agricultural lands andwetlands) surrounding urban areas may increase exposure to allergenic pollen in the urban area, potentiallyaffecting the health of a large proportion of the population.
Journal: Urban Forestry and Urban Greening
Number of pages: 10