Abstract
The Danish part of a cooperative European research effort on experimental manipulation of forest ecosystems in Europe is described. The aim was to quantify the biogeochemical cycling of elements, turnover of biomass and the effects of atmospheric deposition on forest ecosystems under vayring atmopsheric deposition loads, soils, and environmental conditions. Studies on input-output ion balances have been performed in a Norway spruce plantation at Klosterhede, Lemvig (Denmark), since 1983. In 1987/88, manipulations of the ecosystem started by establishing research plots, where the atmospheric input of strong acids to the soil has been removed by a roof construction under the canopy. Under the roof, experimental plots were established with optimal irrigation, optimal nutrition and irrigation (fertigation), and drought. After 3-4 years of experimental manipulations the change of atmospheric input of ions to the experimental plots has only as yet changed the ion fluxes in the soil and the soil solution chemistry to a minor extent. But significant biological response on the biota are seen. Experimentally created drought periods during the summer period have shown a significantly negative effect on tree growth and canopy relations (needle loss and cone production). Drought has a negative effect on forest vitality, whereas removal of strong
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Citation Formats
Rasmussen, L, and Hansen, K.
Air pollution effects on forests examined by manipulation of the forest ecosystem.
Denmark: N. p.,
1992.
Web.
Rasmussen, L, & Hansen, K.
Air pollution effects on forests examined by manipulation of the forest ecosystem.
Denmark.
Rasmussen, L, and Hansen, K.
1992.
"Air pollution effects on forests examined by manipulation of the forest ecosystem."
Denmark.
@misc{etde_10144713,
title = {Air pollution effects on forests examined by manipulation of the forest ecosystem}
author = {Rasmussen, L, and Hansen, K}
abstractNote = {The Danish part of a cooperative European research effort on experimental manipulation of forest ecosystems in Europe is described. The aim was to quantify the biogeochemical cycling of elements, turnover of biomass and the effects of atmospheric deposition on forest ecosystems under vayring atmopsheric deposition loads, soils, and environmental conditions. Studies on input-output ion balances have been performed in a Norway spruce plantation at Klosterhede, Lemvig (Denmark), since 1983. In 1987/88, manipulations of the ecosystem started by establishing research plots, where the atmospheric input of strong acids to the soil has been removed by a roof construction under the canopy. Under the roof, experimental plots were established with optimal irrigation, optimal nutrition and irrigation (fertigation), and drought. After 3-4 years of experimental manipulations the change of atmospheric input of ions to the experimental plots has only as yet changed the ion fluxes in the soil and the soil solution chemistry to a minor extent. But significant biological response on the biota are seen. Experimentally created drought periods during the summer period have shown a significantly negative effect on tree growth and canopy relations (needle loss and cone production). Drought has a negative effect on forest vitality, whereas removal of strong acids from air pollution in combination with a small change in the hydrological and biogeochemical cycles has a positive effect on the vitality of the forest ecosystem. It is not clear if the removal of strong acids alone will improve the ecological conditions for the ecosystem. (AB) (86 refs.).}
place = {Denmark}
year = {1992}
month = {Jan}
}
title = {Air pollution effects on forests examined by manipulation of the forest ecosystem}
author = {Rasmussen, L, and Hansen, K}
abstractNote = {The Danish part of a cooperative European research effort on experimental manipulation of forest ecosystems in Europe is described. The aim was to quantify the biogeochemical cycling of elements, turnover of biomass and the effects of atmospheric deposition on forest ecosystems under vayring atmopsheric deposition loads, soils, and environmental conditions. Studies on input-output ion balances have been performed in a Norway spruce plantation at Klosterhede, Lemvig (Denmark), since 1983. In 1987/88, manipulations of the ecosystem started by establishing research plots, where the atmospheric input of strong acids to the soil has been removed by a roof construction under the canopy. Under the roof, experimental plots were established with optimal irrigation, optimal nutrition and irrigation (fertigation), and drought. After 3-4 years of experimental manipulations the change of atmospheric input of ions to the experimental plots has only as yet changed the ion fluxes in the soil and the soil solution chemistry to a minor extent. But significant biological response on the biota are seen. Experimentally created drought periods during the summer period have shown a significantly negative effect on tree growth and canopy relations (needle loss and cone production). Drought has a negative effect on forest vitality, whereas removal of strong acids from air pollution in combination with a small change in the hydrological and biogeochemical cycles has a positive effect on the vitality of the forest ecosystem. It is not clear if the removal of strong acids alone will improve the ecological conditions for the ecosystem. (AB) (86 refs.).}
place = {Denmark}
year = {1992}
month = {Jan}
}