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Publications

NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.

NIBIO's Scientific Publications →

1995

Authors

Praveen Sharma Anders Lönneborg

Abstract

No abstract has been registered

To document

Authors

Jens Kværner Per Kraft

Abstract

No abstract has been registered

Authors

Frederick Asiegbu Geoffrey Daniel Martin Johansson

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No abstract has been registered

Authors

B. Mankovska K. Vrana Eiliv Steinnes Richard Horntvedt

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No abstract has been registered

Authors

Dan Aamlid Kåre Olav Venn Svein Solberg Tord K. Rindal

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No abstract has been registered

Authors

Tore Skrøppa

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No abstract has been registered

Authors

Richard Frederic Wright Tor Erik Brandrud Anna Clemmensson-Lindell Hans Hultberg O. Janne Kjønaas Filip Moldan Hans Persson Arne Stuanes

Abstract

No abstract has been registered

Authors

Richard Frederic Wright J.G.M. Roelofs M. Bredemeier Kai Blanck Andries W. Boxman Bridget A. Emmett Per Gundersen H. Hultberg O. Janne Kjønaas Filip Moldan Albert Tietema N. van Breemen H.F.G. van Dijk

Abstract

In large regions of Europe and eastern North America atmospheric deposition of inorganic nitrogen compounds has greatly increased the natural external supply to forest ecosystems. This leads to nitrogen saturation, in which availability of inorganic nitrogen is in excess of biological demand and the ecosystem is unable to retain all incoming nitrogen. The large-scale experiments of the NITREX project (nitrogen saturation experiments) are designed to provide information regarding the patterns and rates of responses of coniferous forest ecosystems to increases in N deposition and the reversibility and recovery of impacted ecosystems following reductions in N deposition. The nitrogen input-output data from the NITREX sites are consistent with the general pattern of nitrogen fluxes from forest ecosystems in Europe. At annual inputs of less than about 10 kg ha-1 year-1, nearly all the nitrogen is retained and outputs are very small. At inputs above about 25 kg ha-1 year-1 outputs are substantial. In the range 10-25 kg ha-1 year-1 these forest ecosystems undergo a transition to nitrogen saturation. The 10 kg ha-1 year-1 apparently represents the minimum threshold for nitrogen saturation.The NITREX experiments indicate that nitrogen outputs respond markedly across the 10-25 kg ha-1 year-1 range of inputs. In contrast, the nutrient concentrations in foliage, a measure of tree response, is delayed by several years. Nitrogen saturation can apparently be induced or reversed within only a few years, at least with respect to the commonly used diagnostic of nitrogen saturation-nitrogen output in leachate or runoff.

To document

Authors

Richard F. Wright J.G.M. Roelofs M. Bredemeier K.. Blanck A.W. Boxman Bridget, A. Emmett Per Gundersen Hans Hultberg O. Janne Kjønaas Filip Moldan Albert Tietema Nico Van Breemen H.F.G. van Dijk

Abstract

No abstract has been registered

To document

Authors

Albert Tietema Richard F. Wright K.. Blanck A.W. Boxman M. Bredemeier Bridget A. Emmett Per Gundersen Hans Hultberg O. Janne Kjønaas Filip Moldan J.G.M. Roelofs Patrick Schleppi Arne O. Stuanes Nico Van Breemen

Abstract

No abstract has been registered