Nitrogen saturation experiments (NITREX) in coniferous forest ecosystems in Europe: a summary of results
| Autor: | Albert Tietema, Richard F. Wright, Filip Moldan, Patrick Schleppi, Bridget A. Emmett, A.W. Boxman, Michael Bredemeier, Per Gundersen |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Biogeochemical cycle
Health Toxicology and Mutagenesis Population 010501 environmental sciences Toxicology 01 natural sciences chemistry.chemical_compound Nitrate Forest ecology Ecosystem education Nitrogen cycle 0105 earth and related environmental sciences Forest floor education.field_of_study Ecology 04 agricultural and veterinary sciences General Medicine 15. Life on land Throughfall Pollution chemistry Agronomy 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science |
| Zdroj: | University of Copenhagen |
| ISSN: | 0269-7491 |
| DOI: | 10.1016/s0269-7491(98)80065-1 |
| Popis: | The effect of changes in dissolved inorganic nitrogen (N) deposition on ecosystem functioning was investigated in the NITREX (NITRogen saturation EXperiments) project. Field-scale manipulation experiments were carried out over four to six years in seven coniferous forest ecosystems in northwestern Europe. At sites with low or moderate ambient N deposition, N was experimentally added to throughfall. At sites with high N deposition, N was removed from throughfall. We found that the capacity of the ecosystem to retain N was correlated to its internal N status. Some of the components of this N status like the N concentrations in foliage and forest floor are relatively easy to measure. The C/N ratio of the forest floor is especially closely related to the onset of nitrate leaching. Changes in N input may, in the long run, change the N status of an ecosystem due to for instance a decrease in C/N ratio in the forest floor. Decreased N input resulted in a rapid and large reduction in N concentration in drainage water. Significant improvement in tree nutritional status, tree growth, fine root biomass and diversity of ground vegetation and mycorrhizal fungi population were observed in one site only. The time period of four to six years of manipulated N deposition may have been too short for changes to be manifested in the other sites. |
| Databáze: | OpenAIRE |
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