Search Results - "Kjønaas, O. J."

Sources of errors and uncertainties in the assessment of forest soil carbon stocks at different scales—review and recommendations by Vanguelova, E. I., Bonifacio, E., De Vos, B., Hoosbeek, M. R., Berger, T. W., Vesterdal, L., Armolaitis, K., Celi, L., Dinca, L., Kjønaas, O. J., Pavlenda, P., Pumpanen, J., Püttsepp, Ü., Reidy, B., Simončič, P., Tobin, B., Zhiyanski, M.

“…Spatially explicit knowledge of recent and past soil organic carbon (SOC) stocks in forests will improve our understanding of the effect of human- and…”
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Increased nitrogen in runoff and soil following 13 years of experimentally increased nitrogen deposition to a coniferous-forested catchment at Gårdsjön, Sweden by Moldan, F., Kjønaas, O.J., Stuanes, A.O., Wright, R.F.

“…Beginning in 1991, we have added nitrogen (N) to the 0.5-ha, N-poor, coniferous-forested catchment G2 NITREX at Gårdsjön, Sweden, to investigate the…”
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Late stage pine litter decomposition: Relationship to litter N, Mn, and acid unhydrolyzable residue (AUR) concentrations and climatic factors by Berg, B., Kjønaas, O.J., Johansson, M.-B., Erhagen, B., Åkerblom, S.

“…•A method to study details in rate-regulating factors for litter decomposition.•Evaluated influence of 3 substrate-quality factors (N, Mn, and AUR) and…”
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Impact of nitrogen deposition on nitrogen cycling in forests: a synthesis of NITREX data by Gundersen, P., Emmett, B.A., Kjønaas, O.J., Koopmans, C.J., Tietema, A.

“…Impact of nitrogen (N) deposition was studied by comparing N fluxes, N concentrations and N pool sizes in vegetation and soil in five coniferous forest stands…”
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NITREX: responses of coniferous forest ecosystems to experimentally changed deposition of nitrogen by Wright, R.F., Roelofs, J.G.M., Bredemeier, M., Blanck, K., Boxman, A.W., Emmett, B.A., Gundersen, P., Hultberg, H., Kjønaas, O.J., Moldan, F., Tietema, A., van Breemen, N., van Dijk, H.F.G.

“…In large regions of Europe and eastern North America atmospheric deposition of inorganic nitrogen compounds has greatly increased the natural external supply…”
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Predicting the Effects of Atmospheric Nitrogen Deposition in Conifer Stands: Evidence from the NITREX Ecosystem-Scale Experiments by Emmett, B. A., Boxman, D., Bredemeier, M., Gundersen, P., Kjønaas, O. J., Moldan, F., Schleppi, P., Tietema, A., Wright, R. F.

“…The NITREX project, which encompasses seven ecosystem-scale experiments in coniferous forests at the plot or catchment level in northwestern Europe,…”
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Nitrogen deposition makes a minor contribution to carbon sequestration in temperate forests by Nadelhoffer, Knute J, Emmett, Bridget A, Gundersen, Per, Kjønaas, O. Janne, Koopmans, Chris J, Schleppi, Patrick, Tietema, Albert, Wright, Richard F

“…Humans have altered global nitrogen cycling such that more atmospheric N2 is being converted ('fixed') into biologically reactive forms by anthropogenic…”
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NITREX: the timing of response of coniferous forest ecosystems to experimentally-changed nitrogen deposition by Tietema, A, Wright, R.F, Blanck, K, Boxman, A.W, Bredemeier, M, Emmett, B.A, Gundersen, P, Hultberg, H, Kjonaas, O.J, Moldan, F

“…In large regions of Europe and eastern North America atmospheric deposition of inorganic nitrogen (N) compounds has greatly increased the natural external…”
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Effects of experimentally altered N input on foliage, litter production and increment in a Norway spruce stand, Gårdsjön, Sweden over a 12-year period by Kjønaas, O.J., Stuanes, A.O.

“…The effect of increased anthropogenic nitrogen (N) input was studied by increasing the ambient throughfall from 11 kg N ha −1 yr −1 to approximately 51 kg ha…”
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Nitrogen leaching from N limited forest ecosystems: the MERLIN model applied to Gårdsjön, Sweden by Kjønaas, O. J., Wright, R. F.

“…Chronic deposition of inorganic nitrogen (N) compounds from the atmosphere to forested ecosystems can alter the status of a forest ecosystem from N-limited…”
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Nitrogen deposition makes a minor contribution to carbon sequestration in temperate forests by NADELHOFFER, K. J, EMMETT, B. A, GUNDERSEN, P, KJØNAAS, O. J, KOOPMANS, C. J, SCHLEPPI, P, TIETEMA, A, WRIGHT, R. F

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Natural abundance of (15)N in forests across a nitrogen deposition gradient by Emmett, B.A. (Wales Univ of Bangor, Bangor, Gwynedd (United Kingdom). Inst. of Terrestrial Ecology), Kjoenaas, O.J, Gundersen, P, Koopmans, C, Tietema, A, Sleep, D

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Effects of experimentally altered N input on foliage, litter production and increment in a Norway spruce stand, GÅrdsjön, Sweden over a 12-year period : Nitrogen deposition by KJØNAAS, O. J, STUANES, A. O

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Potential nitrogen transformations in mineral soils of two coniferous forests exposed to different N inputs by Vestgarden, Live S, Kjønaas, O.Janne

“…The objective of this study was to quantify the net potential N mineralisation and nitrification rates in mineral soils of two coniferous forest soils…”
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In Situ Efficiency of Ion Exchange Resins in Studies of Nitrogen Transformation by Kjonaas, O Janne

“…Mixed‐bed ion‐exchange resin bags have previously been used in studies of soil N transformation rates with NH4‐N and NO3‐N being adsorbed from the solution…”
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Factors Affecting Stability and Efficiency of Ion Exchange Resins in Studies of Soil Nitrogen Transformation by Kjonaas, O. Janne

“…Mixtures of cation and anion exchange resins are used as part of the resin core technique to determine nitrogen transformation in forest soils as they adsorb…”
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Soil solution chemistry during four years of NH4NO3 addition to a forested catchment at Gardsjön, Sweden: The whole ecosystem experiments of the NITREX and EXMAN projects by STUANES, A. O, KJØNAAS, O. J

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Nitrate leaching in coniferous forest ecosystems: the European field-scale manipulation experiments NITREX (nitrogen saturation experiments) and EXMAN (experimental manipulation of forest ecosystems) by Tietema, A. (University of Amsterdam, Amsterdam, Netherlands.), Beier, C, Visser, P.H.B. de, Emmett, B.A, Gundersen, P, Kjonaas, O.J, Koopmans, C.J

“…The results of two European field‐scale manipulation projects (NITREX (nitrogen saturation experiments) and EXMAN (experimental manipulation of forest…”
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Effects of weekly nitrogen additions on N cycling in a coniferous forest catchment, Gardsjön, Sweden: The whole ecosystem experiments of the NITREX and EXMAN projects by KJØNAAS, O. J, STUANES, A. O, HUSE, M

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Use of super(1) super(5)N-labelled nitrogen deposition to quantify the source of nitrogen in runoff at a coniferous-forested catchment at Gardsjon, Sweden by Kjonaas, O J, Wright, R F

“…To determine the source of dissolved inorganic nitrogen (N) in runoff, approx. 35kg N enriched with the stable isotope super(1) super(5)N (2110%% d super(1)…”
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