Abstract
The purpose of the monitoring programme is to quantify sulphur and nitrogen deposition to forests, and to illustrate possible acidification of the soil. The deposition is investigated by precipitation studies in open field areas and by throughfall studies in forest stands . Soilwater chemistry is examined in the forest stands and used as indicator of soil condition. Most locations were established during 1992 and this report concerns the hydrological year from October 1992 through September 1993 for 17 locations in the four most northern counties of Sweden. Monitoring has shown a gradient from coastal to inland locations. The lowest pH and highest deposition of sulphur and nitrogen have been registered in coastal areas. Precipitation from coastal locations has an average pH between 4.5 and 4.8. Corresponding values for inland locations averaged 4.8-5.0. Sulphur deposition at coastal locations amounted 3-5 kg per hectare. This exceeds the critical load of sulphur for this area: 2.5 kg sulphur per hectare and year. Deposition of nitrogen showed higher amounts in open field areas than in throughfall, due to considerable biosorption of nitrogen in the tree canopies. The largest nitrogen deposition was found around Umeaa, where open field measurements showed 5 kg nitrogen deposited per
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Citation Formats
Hallgren Larsson, E, and Westling, O.
Air pollution in northern Sweden. Deposition and effect Oct 1992 - Sep 1993; Luftfoeroreningar i norra Sverige; Nedfall och effekter oktober 1992 till september 1993.
Sweden: N. p.,
1994.
Web.
Hallgren Larsson, E, & Westling, O.
Air pollution in northern Sweden. Deposition and effect Oct 1992 - Sep 1993; Luftfoeroreningar i norra Sverige; Nedfall och effekter oktober 1992 till september 1993.
Sweden.
Hallgren Larsson, E, and Westling, O.
1994.
"Air pollution in northern Sweden. Deposition and effect Oct 1992 - Sep 1993; Luftfoeroreningar i norra Sverige; Nedfall och effekter oktober 1992 till september 1993."
Sweden.
@misc{etde_10142946,
title = {Air pollution in northern Sweden. Deposition and effect Oct 1992 - Sep 1993; Luftfoeroreningar i norra Sverige; Nedfall och effekter oktober 1992 till september 1993}
author = {Hallgren Larsson, E, and Westling, O}
abstractNote = {The purpose of the monitoring programme is to quantify sulphur and nitrogen deposition to forests, and to illustrate possible acidification of the soil. The deposition is investigated by precipitation studies in open field areas and by throughfall studies in forest stands . Soilwater chemistry is examined in the forest stands and used as indicator of soil condition. Most locations were established during 1992 and this report concerns the hydrological year from October 1992 through September 1993 for 17 locations in the four most northern counties of Sweden. Monitoring has shown a gradient from coastal to inland locations. The lowest pH and highest deposition of sulphur and nitrogen have been registered in coastal areas. Precipitation from coastal locations has an average pH between 4.5 and 4.8. Corresponding values for inland locations averaged 4.8-5.0. Sulphur deposition at coastal locations amounted 3-5 kg per hectare. This exceeds the critical load of sulphur for this area: 2.5 kg sulphur per hectare and year. Deposition of nitrogen showed higher amounts in open field areas than in throughfall, due to considerable biosorption of nitrogen in the tree canopies. The largest nitrogen deposition was found around Umeaa, where open field measurements showed 5 kg nitrogen deposited per hectare and year. At this station, as well as at four locations in the county of Vaesternorrland, deposition of nitrogen exceeded the critical load of nitrogen: 3 kg nitrogen per hectare and year. Soilwater studies confirmed results from last year with the regions lowest pH-values (4.6-4.7) and highest aluminium concentrations in soilwater from the two coastal sites nearby Umeaa and Luleaa. The ratio between base cations and aluminium in soilwater is used as indicator of soil acidification status, and potential risk of harmful effects of aluminium towards roots. The lowest ratios (greatest ecological risk) were found in soilwater from nearby Umeaa and Luleaa. 7 refs, 49 figs, 5 tabs}
place = {Sweden}
year = {1994}
month = {Mar}
}
title = {Air pollution in northern Sweden. Deposition and effect Oct 1992 - Sep 1993; Luftfoeroreningar i norra Sverige; Nedfall och effekter oktober 1992 till september 1993}
author = {Hallgren Larsson, E, and Westling, O}
abstractNote = {The purpose of the monitoring programme is to quantify sulphur and nitrogen deposition to forests, and to illustrate possible acidification of the soil. The deposition is investigated by precipitation studies in open field areas and by throughfall studies in forest stands . Soilwater chemistry is examined in the forest stands and used as indicator of soil condition. Most locations were established during 1992 and this report concerns the hydrological year from October 1992 through September 1993 for 17 locations in the four most northern counties of Sweden. Monitoring has shown a gradient from coastal to inland locations. The lowest pH and highest deposition of sulphur and nitrogen have been registered in coastal areas. Precipitation from coastal locations has an average pH between 4.5 and 4.8. Corresponding values for inland locations averaged 4.8-5.0. Sulphur deposition at coastal locations amounted 3-5 kg per hectare. This exceeds the critical load of sulphur for this area: 2.5 kg sulphur per hectare and year. Deposition of nitrogen showed higher amounts in open field areas than in throughfall, due to considerable biosorption of nitrogen in the tree canopies. The largest nitrogen deposition was found around Umeaa, where open field measurements showed 5 kg nitrogen deposited per hectare and year. At this station, as well as at four locations in the county of Vaesternorrland, deposition of nitrogen exceeded the critical load of nitrogen: 3 kg nitrogen per hectare and year. Soilwater studies confirmed results from last year with the regions lowest pH-values (4.6-4.7) and highest aluminium concentrations in soilwater from the two coastal sites nearby Umeaa and Luleaa. The ratio between base cations and aluminium in soilwater is used as indicator of soil acidification status, and potential risk of harmful effects of aluminium towards roots. The lowest ratios (greatest ecological risk) were found in soilwater from nearby Umeaa and Luleaa. 7 refs, 49 figs, 5 tabs}
place = {Sweden}
year = {1994}
month = {Mar}
}