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Nitrogen in soil water of coniferous forests

effects of anthropogenic disturbances

Rappe George, Martin (2016). Nitrogen in soil water of coniferous forests. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2016:10
ISBN 978-91-576-8522-3
eISBN 978-91-576-8523-0
[Doctoral thesis]

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Abstract

In boreal and temperate forests, long-term elevated nitrogen (N) load may eventually saturate forest ecosystems with N, i.e. total N ecosystem input exceed ecosystem sinks for N, and N losses via soil water transport may then increase and negatively impact environmental quality.

This thesis is based upon four studies (reported in papers I-IV), and the overall aims were to assess and analyse effects on soil water N in coniferous forests of two types of anthropogenic disturbance: “chemical disturbance” (long-term experimental N addition and N deposition), and “physical disturbance” (clear-cutting and subsequent soil scarification). Effects of these disturbances were addressed in both field experiments and process-based ecosystem modelling. In the field experiments, soil water N was collected from both organic (O) horizons and mineral soil, at 0.5 m depth, during several growing seasons to assess temporal variation in the N concentration (Paper I). In addition, microbial variables in soil samples of the O-horizon were analysed in the laboratory to assess responses of the soil microbial community to long-term N addition in forest experiments and along a N deposition gradient (Papers II and IV). In the modelling, a process-based ecosystem carbon and N model (CoupModel) was calibrated to measurements obtained during the regeneration phase of a Scots pine (Pinus sylvestris L.) forest in an N fertilization experiment where soil scarification was applied (Paper III).

The results showed that long-term N addition to a boreal Norway spruce (Picea abies (L.) Karst) forest can alter the quantity and seasonal dynamics of dissolved organic nitrogen (DON) concentrations in soil water collected from the O-horizon. However, DON concentrations were low in soil water collected from mineral soil under all N treatments and probably only contributed to small net N losses in this forest. Although microbial variables of the O-horizon were affected by N loading they were similar under N loading that resulted in the leaching of small amounts of nitrate (<2 kg ha⁻¹ year⁻¹ of NO₃-N) and those that resulted in the leaching of large amounts (>15 kg ha⁻¹ year⁻¹ of NO₃-N). Further, soil scarification increased soil water N leaching from a Scots pine forest, as calculated with the CoupModel, during the regeneration phase, particularly in previously N-fertilized pine stands.

Authors/Creators:Rappe George, Martin
Title:Nitrogen in soil water of coniferous forests
Subtitle:effects of anthropogenic disturbances
Series/Journal:Acta Universitatis agriculturae Sueciae (1652-6880)
Year of publishing :2016
Depositing date:20 January 2016
Volume:2016:10
Number of Pages:83
Papers/manuscripts:
NumberReferences
IRappe George, M. O., Gärdenäs, A. I., Kleja, D. B. (2013). The impact of four decades of annual nitrogen addition on dissolved organic matter in a boreal forest soil. Biogeosciences 10, 1365-1377.
IIRappe George, M. O., Choma, M., Čapek, P., Börjesson, G., Kaštovská, E., Šantrůčková, H., Gärdenäs, A. I. (Manuscript). Effects of long-term nitrogen addition and deposition on microbial variables in the organic horizon of Norway spruce forest soils.
IIIRappe George, M. O., Hansson, L. I., Ring, E., Jansson, P.-E., Gärdenäs, A. I. (Manuscript). Nitrogen leaching following clear-cutting and soil scarification from a forest regeneration area in Sweden - a modelling study based upon a fertilization experiment.
IVChoma, M., Rappe George, M. O., Čapek, P., Bartá, J., Kaštovská, E., Gärdenäs, A. I., Šantrůčková, H. (Manuscript). Recovery of the ectomycorrhizal community after termination of long-term nitrogen fertilization of a boreal Norway spruce forest.
Place of Publication:Uppsala
Publisher:Department of Soil and Environment, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-8522-3
ISBN for electronic version:978-91-576-8523-0
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:P Natural resources > P33 Soil chemistry and physics
P Natural resources > P35 Soil fertility
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Agrovoc terms:boreal forests, pinus sylvestris, picea abies, forest soils, nitrogen, leaching, clear felling, soil scarification, fertilizer application, soil water, sweden
Keywords:nitrogen, forest, water
URN:NBN:urn:nbn:se:slu:epsilon-e-3183
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-3183
ID Code:12968
Faculty:S - Faculty of Forest Sciences
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
External funders:CLEO (Climate Change and Environmental Objectives) and FORMAS
Deposited By: Martin Rappe George
Deposited On:21 Jan 2016 07:32
Metadata Last Modified:05 Feb 2016 19:06

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