Increased nitrogen in runoff and soil following 13 years of experimentally increased nitrogen deposition to a coniferous-forested catchment at Gårdsjön, Sweden
| Autor: | A.O. Stuanes, Filip Moldan, Richard F. Wright, O.J. Kjønaas |
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| Rok vydání: | 2005 |
| Předmět: |
Time Factors
Nitrogen Health Toxicology and Mutagenesis Ammonium nitrate chemistry.chemical_element Toxicology chemistry.chemical_compound Soil Nutrient Soil Pollutants Leaching (agriculture) Nitrites Forest floor Hydrology Sweden Forestry General Medicine Pinus Pollution Soil contamination Quaternary Ammonium Compounds chemistry Environmental chemistry Environmental science Acid rain Adsorption Surface runoff Environmental Pollution Water Pollutants Chemical |
| Zdroj: | Environmental pollution (Barking, Essex : 1987). 144(2) |
| ISSN: | 0269-7491 |
| Popis: | Beginning in 1991, we have added nitrogen (N) to the 0.5-ha, N-poor, coniferous-forested catchment G2 NITREX at Gardsjon, Sweden, to investigate the consequences of chronic elevated N deposition. We have added 40 kg N ha −1 yr −1 in fortnightly doses of NH 4 NO 3 to the ambient 15 kg N ha −1 yr −1 by means of a sprinkling system. NO 3 concentrations in runoff increased during 13 years from −1 , and in 2004 comprised about 10% of N input. Inhibition of NO 3 immobilisation due to increased availability of NH 4 might explain the increased leaching of NO 3 . C and N pools in the forest floor increased but C/N ratio has not changed. The increase in NO 3 leaching thus occurred independently of change in C/N ratio. The results from Gardsjon demonstrate that increased leaching of inorganic N and decrease in C/N ratio respond to increased N deposition at greatly different time scales. |
| Databáze: | OpenAIRE |
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