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Modeling approaches for agricultural N2O fluxes from large scale areas: A case for sugarcane crops in the state of São Paulo - Brazil

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  • Dias de Oliveira, Marcelo Eduardo
  • Moraes, Sergio Oliveira

Abstract

Anthropogenic greenhouse gas (GHG) emissions and climate change are issues that currently receive a great deal of attention, both from society and the scientific community. Combustion of fossil fuels is considered the main reason for the increasing concentrations of GHG in the atmosphere and therefore, the main cause of climate change. In such context, biofuels are usually presented as an energy source that considerably reduces GHG emissions when compared to the use of fossil fuels. However, some issues of biofuel production such as the emissions associated with both change in land use and the use of nitrogen fertilizers are still under scrutiny. The focus of this study is related to N2O soil emissions associated with sugarcane ethanol production in Brazil. Signatory countries of the United Nation's Framework Convention on Climate Change (UNFCCC) are required to prepare and periodically update an inventory of GHG emissions and sinks. The International Panel of Climate Change (IPCC), through the Agriculture, Forest and Other Land Use (AFOLU), establishes guidelines to calculate N2O soil emissions on three different levels, or tiers. The simplest Tier 1 uses few equations and default emissions factors. The most elaborated, Tier 3, uses computation modeling, field measurements and Geographic Information Systems (GIS). This study proposes using the limited data available, procedures for Tier 3 estimates of N2O soil emissions in sugarcane crops in the state of São Paulo - Brazil. It also compares N2O sugarcane emissions calculated by Tier 1 and Tier 3 methods. Results show that in most cases the difference in results from Tier 1 and Tier 3 methods are beyond the error margin of the Brazilian Inventory.

Suggested Citation

  • Dias de Oliveira, Marcelo Eduardo & Moraes, Sergio Oliveira, 2017. "Modeling approaches for agricultural N2O fluxes from large scale areas: A case for sugarcane crops in the state of São Paulo - Brazil," Agricultural Systems, Elsevier, vol. 150(C), pages 1-11.
    • Handle: RePEc:eee:agisys:v:150:y:2017:i:c:p:1-11
    DOI: 10.1016/j.agsy.2016.09.015
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    References listed on IDEAS

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    1. Emilio Lebre La Rovere & Andre Santos Pereira & Andre Felipe Simoes, 2011. "Biofuels and Sustainable Energy Development in Brazil," Post-Print hal-00715546, HAL.
    2. La Rovere, Emilio Lèbre & Pereira, André Santos & Simões, André Felipe, 2011. "Biofuels and Sustainable Energy Development in Brazil," World Development, Elsevier, vol. 39(6), pages 1026-1036, June.
    3. Searchinger, Timothy & Heimlich, Ralph & Houghton, R. A. & Dong, Fengxia & Elobeid, Amani & Fabiosa, Jacinto F. & Tokgoz, Simla & Hayes, Dermot J. & Yu, Hun-Hsiang, 2008. "Use of U.S. Croplands for Biofuels Increases Greenhouse Gases Through Emissions from Land-Use Change," Staff General Research Papers Archive 12881, Iowa State University, Department of Economics.
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