Abstract
Atmospheric deposition is the main input of plant nutrients as well as of acidifying elements in Danish forest ecosystems. The aim was to investigate further the element balance and production of the forests under changing environmental conditions, possible counter actions and the significance of acids and cations deposition which may affect general forest health. Measurements on bulk precipitation, gas and aerosols etc. were carried out at the Danish forest districts of Frederiksborg, Ulborg and Lindet. It was found that ozone limits are highest in the summer, when conifers are most sensitive to ozone. 1-hour maximum values exceeded the 75 ppb-level, the critical level, in episodes of a few days duration. The corresponding critical level for the 7-hour daily mean is 30 ppb. This level was constantly exceeded during April-June. High day and night values of SO{sub 2} and NO{sub 2} occurred in the winter. Sulphur deposition was 11-23 kgS/ha p.a. at Ulborg with a small decrease during 1985-92. Ammonia concentration was 10{sup m}u{sup g} NH{sub 3}-N/m{sup 3} at Lindet and 0.5 {mu}g/m{sup 3} and 1.5 {mu}/m{sup 3} in the other two districts. Dry deposition of ammonia to coniferous forest at Ulborg was 7 kg N/ha, 3 times larger than hitherto.
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Hovmand, M F;
Andersen, H V;
[1]
Bille-Hansen, J;
[2]
Ro-Poulsen, H
[3]
- Danmarks Miljoeundersoegelser (Denmark)
- Forksningscentret for Skov og Landskab (Denmark)
- Koebenhavns Universitet (Denmark)
Citation Formats
Hovmand, M F, Andersen, H V, Bille-Hansen, J, and Ro-Poulsen, H.
Atmospheric deposition of substances to Danish forest ecosystems; Atmosfaerens stoftilfoersel til danske skovoekosystemer.
Denmark: N. p.,
1994.
Web.
Hovmand, M F, Andersen, H V, Bille-Hansen, J, & Ro-Poulsen, H.
Atmospheric deposition of substances to Danish forest ecosystems; Atmosfaerens stoftilfoersel til danske skovoekosystemer.
Denmark.
Hovmand, M F, Andersen, H V, Bille-Hansen, J, and Ro-Poulsen, H.
1994.
"Atmospheric deposition of substances to Danish forest ecosystems; Atmosfaerens stoftilfoersel til danske skovoekosystemer."
Denmark.
@misc{etde_10196348,
title = {Atmospheric deposition of substances to Danish forest ecosystems; Atmosfaerens stoftilfoersel til danske skovoekosystemer}
author = {Hovmand, M F, Andersen, H V, Bille-Hansen, J, and Ro-Poulsen, H}
abstractNote = {Atmospheric deposition is the main input of plant nutrients as well as of acidifying elements in Danish forest ecosystems. The aim was to investigate further the element balance and production of the forests under changing environmental conditions, possible counter actions and the significance of acids and cations deposition which may affect general forest health. Measurements on bulk precipitation, gas and aerosols etc. were carried out at the Danish forest districts of Frederiksborg, Ulborg and Lindet. It was found that ozone limits are highest in the summer, when conifers are most sensitive to ozone. 1-hour maximum values exceeded the 75 ppb-level, the critical level, in episodes of a few days duration. The corresponding critical level for the 7-hour daily mean is 30 ppb. This level was constantly exceeded during April-June. High day and night values of SO{sub 2} and NO{sub 2} occurred in the winter. Sulphur deposition was 11-23 kgS/ha p.a. at Ulborg with a small decrease during 1985-92. Ammonia concentration was 10{sup m}u{sup g} NH{sub 3}-N/m{sup 3} at Lindet and 0.5 {mu}g/m{sup 3} and 1.5 {mu}/m{sup 3} in the other two districts. Dry deposition of ammonia to coniferous forest at Ulborg was 7 kg N/ha, 3 times larger than hitherto. Total nitrogen deposition at Ulborg was 17-20 kg N/ha p.a. The highest deposition of sea salt was found in the 1980s during which periods the health of Norway spruces was poor. A marked decrease in the pH of soil water, especially under Sitka spruce plots, was observed. The content of available cations in the soil is lowest at Lindet and highest at Frederiksborg. It is indicated that atmospheric deposition of base cations is of major importance to the nutrient supply of forests. (AB) (21 refs.)}
place = {Denmark}
year = {1994}
month = {Dec}
}
title = {Atmospheric deposition of substances to Danish forest ecosystems; Atmosfaerens stoftilfoersel til danske skovoekosystemer}
author = {Hovmand, M F, Andersen, H V, Bille-Hansen, J, and Ro-Poulsen, H}
abstractNote = {Atmospheric deposition is the main input of plant nutrients as well as of acidifying elements in Danish forest ecosystems. The aim was to investigate further the element balance and production of the forests under changing environmental conditions, possible counter actions and the significance of acids and cations deposition which may affect general forest health. Measurements on bulk precipitation, gas and aerosols etc. were carried out at the Danish forest districts of Frederiksborg, Ulborg and Lindet. It was found that ozone limits are highest in the summer, when conifers are most sensitive to ozone. 1-hour maximum values exceeded the 75 ppb-level, the critical level, in episodes of a few days duration. The corresponding critical level for the 7-hour daily mean is 30 ppb. This level was constantly exceeded during April-June. High day and night values of SO{sub 2} and NO{sub 2} occurred in the winter. Sulphur deposition was 11-23 kgS/ha p.a. at Ulborg with a small decrease during 1985-92. Ammonia concentration was 10{sup m}u{sup g} NH{sub 3}-N/m{sup 3} at Lindet and 0.5 {mu}g/m{sup 3} and 1.5 {mu}/m{sup 3} in the other two districts. Dry deposition of ammonia to coniferous forest at Ulborg was 7 kg N/ha, 3 times larger than hitherto. Total nitrogen deposition at Ulborg was 17-20 kg N/ha p.a. The highest deposition of sea salt was found in the 1980s during which periods the health of Norway spruces was poor. A marked decrease in the pH of soil water, especially under Sitka spruce plots, was observed. The content of available cations in the soil is lowest at Lindet and highest at Frederiksborg. It is indicated that atmospheric deposition of base cations is of major importance to the nutrient supply of forests. (AB) (21 refs.)}
place = {Denmark}
year = {1994}
month = {Dec}
}