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Impacts of climate change on carbon and nitrogen cycles in boreal forest ecosystems

Eliasson, Peter (2007). Impacts of climate change on carbon and nitrogen cycles in boreal forest ecosystems. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2007:89
ISBN 978-91-576-7388-6
[Doctoral thesis]

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It is well known that soil carbon stocks decrease considerably in response to soil warming, but experimental data have shown that the loss of carbon declines within decades in apparent acclimation. An explanation to such findings is offered under the theoretical framework of ecosystem models in this thesis. Simulations of forest ecosystem responses to increased soil temperatures showed that the labile carbon in soil was reduced considerably within years after warming, although the structure and function of decomposer organisms remained intact. Simulations of increased CO2 also confirmed positive growth response in the short term. The response of soil carbon was similar, however predicted to be less than the increase of biomass. Nitrogen availability and negative feedback mechanisms of the plant soil system were critical to the results, indicating that nitrogen progressively limited the growth response. Assumptions concerning the response of decomposing organisms to changes in soil nitrogen are crucial to the interpretation of the above. Positive nitrogen feedback was therefore implemented to test consequences of nitrogen additions, allowing for improved decomposer efficiency when inorganic nitrogen becomes available in the soil. Responses compared well with experimental results. Simulations of moderate inputs of slowly increasing inorganic nitrogen loads in the long term revealed counteracting feedback responses: the positive nitrogen feedback resulted in increased decomposer efficiency and biomass growth also increased as expected; negative nitrogen feedback appeared in the sense that the growth response was reduced due to decreased mineralisation. An economic estimation of the net value of carbon sink capacity was also performed. The value of the carbon sink was given in relation to conservative estimates of total net values of important stocks and flows of forest natural capital – factors such as recreational values or hydrological services omitted. The net value of the carbon sink was suggested to amount to 3-50% of the net value of Swedish forests.

Authors/Creators:Eliasson, Peter
Title:Impacts of climate change on carbon and nitrogen cycles in boreal forest ecosystems
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2007
Number of Pages:41
ALLI. Eliasson, P. (1997). Carbon fixation in Swedish forests in the context of environmental national accounts. In: Climate change mitigation and European land-use policies (eds. W.N. Adger, D. Pettenella & M. Whitby). Guilford and King's Lynn, UK, CAB International: 239-253. II. Eliasson, P.E., McMurtrie, R.E., Pepper, D.A. et al. (2005). The response of heterotrophic CO2-flux to soil warming. Global Change Biology 11(1): 167-181. III. Pepper, D.A., Eliasson, P.E. McMurtrie. R.E et al. (2006). Simulated mechanisms of N feedback on positive forest CO2 response. Global Change Biology 13(6): 1265-1281. IV. Eliasson, P.E. & Ågren, G.I.A. Feedback mechanisms of soil mineralisation rate and timing of growth response in a boreal forest ecosystem. (Manuscript).
Place of Publication:Uppsala
ISBN for printed version:978-91-576-7388-6
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:boreal forests, climatic change, greenhouse effect, carbon cycle, mineralization, nitrogen cycle, photosynthesis, primary productivity, soil temperature, environmental impact, valuation, ecosystems, models
Keywords:boreal forest, climate change, continuous-quality theory, decomposer efficiency, G’DAY, generic decomposition and yield model, natural capital, satellite net national accounts, nitrogen productivity, Q-model, soil decomposition, soil warming
Permanent URL:
ID Code:1525
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
Deposited By: Dr Peter Eliasson
Deposited On:29 Aug 2007 00:00
Metadata Last Modified:02 Dec 2014 10:12

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