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capri:concept:dndcmeta [2011/04/11 12:47]
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capri:concept:dndcmeta [2011/04/11 12:48] (current)
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 +<​H2><​a class="​intext"​ HREF="/​dokuwiki/​doku.php?​id=capri:​concept:​spatialdownscaling">​Selected environmental indicators at 1x1 km grid resolution</​A><​BR>​ - DNDC link and Statistical Meta Model from DNDC</​H2>​
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 +Main Contributors for DNDC link: Adrian Leip<​BR>​
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 +Main Contributor for statistical meta model: Wolfgang Britz, Adrian Leip
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 +<hr style="​color:​ '​blue';​ height: '​2';​ text-align: '​left';​ width: 590">​
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 +<​P><​a class="​intext"​ href="​http://​www.dndc.sr.unh.edu">​DNDC</​a>​ for <​B>​DeNitrification-DeComposition</​B>​ is a computer simulation model of carbon and nitrogen biogeochemistry in agro-ecosystems.
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 +The model can be used for predicting crop growth, soil temperature and moisture regimes, soil carbon dynamics, nitrogen leaching, and emissions of trace gases including nitrous oxide (N2O),
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 +nitric oxide (NO), dinitrogen (N2), ammonia (NH3), methane (CH4) and carbon dioxide (CO2). At JRC, the DNDC model is currently used by the <a class="​intext"​ href="​http://​ccu.jrc.it">​Climate Change Unit,
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 +Greenhouse gases in Agriculture,​ Forestry and other Land Uses Action</​a>​ of JRC.</​P>​
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 +<​P>​For represenative combination of crops and soils for each NUTS II regions, DNDC runs were performed, systematically changing mineral and organic application rates, and allowing for irrigation or not.
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 +Each run covered 100 years to allow for a stabilization of the carbon and nitrogen content of the soil. The observations from those about 100.000 simulation runs were used to estimate
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 +statistical regression models per crop for selected output variables of DNDC:</​P>​
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 +<ul>
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 +   <​li>​Water and nitrogen leached</​li>​
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 +   <​li>​Gaseous emission of nitrogen: NO, N2, NH3</​li>​
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 +   <​li>​Water transpirated and water evaporated</​li>​
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 +   <​li>​Crop yields</​li>​
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 +</ul>
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 +<​P>​using soil and climatic parameters, as well as potential yields and fertilizer application rates as explanatory variables. In more then 70% of the cases, the R2 was above 85% with
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 +all variables at a significance level above 0.1%. Given that perfect calibration of the DNDC crop yields at the <a class="​intext"​ HREF="/​dokuwiki/​doku.php?​id=capri:​concept:​SpatFert">​estimated fertilizer application rates</​a>​
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 +to those <a HREF="/​dokuwiki/​doku.php?​id=capri:​concept:​SpatYields"​ class="​intext">​estimated from MARS potential yields and
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 +scaled to be consistent to the one observed at NUTS II level</​a>​ would be impossible, the potential yields are re-calibrated in the forecasting step.</​P>​
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 +<​P><​img src="​images\DNDC.jpg"​ width="​801"</​P>​
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 +<hr style="​color:​ '​blue';​ height: '​2';​ text-align: '​left';​ width: 590">​
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 +<​H3>​More information</​H3>​
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 +<P class="​pubparagraph"><​span class="​pubAuthor">​Wolfgang Britz and Adrian Leip:</​span><​BR>​
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 +<​I><​a HREF="​..\docs\dndc_meta.pdf"​ class="​intext">​A statistical meta model of DNDC to estimate nitrogen fate and the water cycle at 1x1 km grid at Pan-European scale, JRC, 2007 (pdf, foils)</​a></​I></​p>​
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 +<P class="​pubparagraph"><​span class="​pubAuthor">​Leip,​ A., Marchi, G., Koeble, R., Kempen, Britz W. and Li, C.</​span>:<​BR>​
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 +<​I><​A HREF="​http://​www.biogeosciences.net/​5/​73/​2008/​bg-5-73-2008.html">​Linking an economic model for European agriculture with a mechanistic model to estimate nitrogen losses from cropland
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 +soil in Europe</​A></​I><​BR>​Biogeosciences,​ 5(1): 73-94A</​P>​
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 +<font size=1>​Last Updated:​Tuesday,​ October 28, 2008
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