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Mais für Ethanol-Produktion: Regionalisierung von Klimaszenarien Einfluss, N-Nutzungseffizienz und Wirksamkeit von Anpassungsstrategien.

Lana, Marcos, Alberto and Eulenstein, Frank and Schlindwein, Sandro L. and Tauschke, Marion and Guevara, Edgardo and Santiago , Santiago (2013) Mais für Ethanol-Produktion: Regionalisierung von Klimaszenarien Einfluss, N-Nutzungseffizienz und Wirksamkeit von Anpassungsstrategien. In: Böden - Lebensgrundlage und Verantwortung, 7. – 12. September 2013, Rostock.

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Abstract

Maize, besides a source of food, is also a source of energy. As any other crop, maize yield – and therefore the ethanol produced – is a response to environmental factors such as soil, weather and management. In a context of climate change, understanding responses is crucial to determine mitigation and adaptation strategies. Crop models are an effective tool to address this. The objective is to present a procedure to assess the impacts of climate scenarios on N use efficiency, yield, so as the effect of crop variety (n=2) and planting date (n=5) as adaptation strategy. The study region is Santa Catarina State, Brazil, where maize is cultivated in more than 800000 ha (average yield: 4,63 ton ha-1). Besides not yet expressive in the region, there is a growing tendency for using maize as biofuel source. Allocation of crop land was done using satellite data, allowing the coupling of weather and 253 complete soil profiles in single polygons (n=4135). DSSAT crop model was calibrated and validated using field data (2004-2010 observations). Weather scenarios generated by RCMs were selected according capability of reproducing observed weather. Simulations run for the 2012-2040 period (437 ppm of [CO2]) without adaptation strategies showed reductions of 12.5% in maize total production. By only using the best maize variety for each polygon (soil + weather), total production was increased by 6%; when using both adaptation strategies – variety and best planting date – total production was increase by 15%. The modeling process indicates N use efficiency increment ranged from 1 – 3% (mostly due [CO2] increment, but also due soil properties and leaching). This analysis showed that N use efficiency rises in high [CO2] scenarios, so as that crop variety and planting date are effective tools to mitigate deleterious effects of climate change, supporting energy crops in the study region.

Item Type: Conference or Workshop Item (Contribution to "Reports of the DBG")
Uncontrolled Keywords: Climate change, crop model, efficiency use
Divisions: Kommissionen > Kommission VI: Bodenschutz und Bodentechnologie
Depositing User: Frank Eulenstein
Date Deposited: 02 Nov 2013 12:57
Last Modified: 02 Nov 2013 12:57
URI: http://eprints.dbges.de/id/eprint/1000

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