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Carbon and nitrogen dynamics in agricultural soils

model applications at different scales in time and space

Karlsson, Thord (2012). Carbon and nitrogen dynamics in agricultural soils. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2012:43
ISBN 978-91-576-7679-5
[Doctoral thesis]

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An understanding of soil organic carbon (C) and nitrogen (N) dynamics is essential for efficient and environmentally sustainable agricultural production. This thesis includes model studies of C mineralization at regional/national level with annual time steps, N balances at field level with annual time steps, and N dynamics at 34 locations within a single field with daily time steps. The same model family (ICBM) was used in all studies. Generally, carbon stocks in mineral soils increased from southern to northern Sweden and were near steady state. Temperature, crop type, and animal density were the main drivers for C fluxes at the regional scale. The inclusion of the changes in soil N stocks in field N balance sheets were necessary for obtaining unbiased estimates of N use efficiency or N surplus. Without these changes in soil N stocks, N surplus in low input systems was underestimated and was overestimated in systems with increasing soil organic matter. The model explained 56% of the total variation in apparent net N mineralization estimated for 34 locations within one field during two growing seasons; however, for a single year, only a small proportion of the variation could be explained. The sources of uncertainty in both measurements and the model at different scales in time and space were addressed, as the precision of available measurements limited model testing and the estimation of critical model parameters. From a decision support perspective, commonly available field data are usually sufficient for models such as ICBM/N in the long-term predicting of the effects of agricultural management on C and N stocks at the field or the regional scale. However, more detailed information and models that are more complex are required for short-term applications at small spatial scales, for example for decision support in a precision farming context.

Authors/Creators:Karlsson, Thord
Title:Carbon and nitrogen dynamics in agricultural soils
Subtitle:model applications at different scales in time and space
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2012
Number of Pages:72
I.Andrén O., Kätterer T., Karlsson T. (2004) ICBM regional model for estimations of dynamics of agricultural soil carbon pools. Nutrient Cycling in Agroecosystems 70:231-239.
II.Andrén O., Kätterer T., Karlsson T., Eriksson J. (2008) Soil C balances in Swedish agricultural soils 1990–2004, with preliminary projections. Nutrient Cycling in Agroecosystems 81:129-144.
III.Karlsson T., Andrén O., Kätterer T., Mattsson L. (2003) Management effects on topsoil carbon and nitrogen in Swedish long-term field experiments - budget calculations with and without humus pool dynamics. European Journal of Agronomy 20:137-147.
IV.Karlsson, T., Delin, S., Kätterer, T., Berglund, K. & Andrén, O. (2011). Simulating site-specific nitrogen mineralization dynamics in a Swedish arable field. Acta Agriculturae Scandinavica, Section B - Soil & Plant Science 61(4), 333-344.
Place of Publication:Uppsala
Publisher:Institutionen för mark och miljö, Sveriges lantbruksuniversitet
ISBN for printed version:978-91-576-7679-5
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:P Natural resources > P34 Soil biology
P Natural resources > P35 Soil fertility
Subjects:Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Soil science > Soil biology
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Agrovoc terms:agricultural soils, carbon, nitrogen, carbon cycle, mineralization, degradation, models, soil fertility, soil management
Keywords:carbon balances, carbon sequestration, decomposition, ICBM, modeling, nitrogen balances, scaling, SOM, SON
Permanent URL:
ID Code:8902
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
External funders:Royal Swedish Academy of Agriculture and Forestry and Stiftelsen Lantbruksforskning
Deposited By: Thord Karlsson
Deposited On:25 May 2012 11:17
Metadata Last Modified:02 Dec 2014 10:51

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