Using Agroecosystem Modeling to Improve the Estimates of N2O Emissions in the Life-Cycle Assessment of Biofuels

Nitrous oxide (N2O) is a potent fertilizer-derived greenhouse gas which plays a predominant role in the life-cycle assessment of biofuels. The use of generic emissions factors to estimate its emissions in such context has been widely criticized because of its lack of accuracy, since N2O emissions are highly dependent on local soil and climate conditions, as well as crop management. This paper proposes an alternative method using an agroecosystem model (CERES-EGC) at interconnected geographical scales (from plot to regional). This method was applied to a case study comparing 1st and 2nd generation bioethanol made from sugar beet and Miscanthus feedstock, respectively, in the Picardy region (France), using a spatially-explicit approach and simple land-use options. This new method made it possible to capture the variability in direct N2O emissions in relation to pedoclimatic conditions. Biomass supply options, minimizing N2O emissions or minimizing the land area used by maximizing high yielding units, were used to select the most suitable arable fields on which to grow the feedstock. There were few differences between the two options in terms of area of land cultivated for both crops. However for sugar beet, the effect of minimizing total direct N2O emissions was more noticeable. Regional yield and N2O emission maps resulted in supply curves useful to optimize the placement of biorefinery facilities and feedstock production fields. This method should be further completed with the estimation of changes in soil carbon stocks to take into account land-use change effects and with landscape-scale simulation to consider indirect downstream emissions.

[1]  Andreas de Neergaard,et al.  Turnover of organic matter in a Miscanthus field: effect of time in Miscanthus cultivation and inorganic nitrogen supply. , 2004 .

[2]  O. Maury,et al.  NitroScape: a model to integrate nitrogen transfers and transformations in rural landscapes. , 2011, Environmental pollution.

[3]  Ward N. Smith,et al.  Erratum to “A tool to link agricultural activity data with the DNDC model to estimate GHG emission factors in Canada” [Agric. Ecosyst. Environ. 136 (3–4) (2010) 301–309] , 2010 .

[4]  Josette Garnier,et al.  Modelling the N cascade in regional watersheds: The case study of the Seine, Somme and Scheldt rivers , 2009 .

[5]  Corinne Le Quéré,et al.  Climate Change 2013: The Physical Science Basis , 2013 .

[6]  Laurent Lardon,et al.  Inclusion of the variability of diffuse pollutions in LCA for agriculture: the case of slurry application techniques , 2010 .

[7]  André Faaij,et al.  Spatial variation of environmental impacts of regional biomass chains , 2012 .

[8]  Rodney T Venterea,et al.  Fertilizer management effects on nitrate leaching and indirect nitrous oxide emissions in irrigated potato production. , 2011, Journal of environmental quality.

[9]  Stefan Seuring,et al.  Supply chain and logistics issues of bio-energy production. , 2011 .

[10]  Marie-Hélène Jeuffroy,et al.  Biomass production and nitrogen accumulation and remobilisation by Miscanthus × giganteus as influenced by nitrogen stocks in belowground organs. , 2011 .

[11]  Dmitri Chatskikh,et al.  Simulation of Effects of Soils, Climate and Management on N2O Emission from Grasslands , 2005 .

[12]  James P. Muir,et al.  Switchgrass simulation by the ALMANAC model at diverse sites in the southern US. , 2005 .

[13]  Emanuele Lugato,et al.  Application of DNDC biogeochemistry model to estimate greenhouse gas emissions from Italian agricultural areas at high spatial resolution. , 2010 .

[14]  Jimmy R. Williams,et al.  Simulating soil C dynamics with EPIC: Model description and testing against long-term data , 2006 .

[15]  Arvin R. Mosier,et al.  DAYCENT model analysis of past and contemporary soil N2O and net greenhouse gas flux for major crops in the USA. , 2005 .

[16]  Wilfried Winiwarter,et al.  Statistical dependence in input data of national greenhouse gas inventories: effects on the overall inventory uncertainty , 2010 .

[17]  S. Hamilton,et al.  Nitrous oxide emission from denitrification in stream and river networks , 2010, Proceedings of the National Academy of Sciences.

[18]  Benoit Gabrielle,et al.  Predicting in situ soil N2O emission using NOE algorithm and soil database , 2005 .

[19]  Changsheng Li,et al.  A model of nitrous oxide evolution from soil driven by rainfall events: 1. Model structure and sensitivity , 1992 .

[20]  A. Hastings,et al.  The development of MISCANFOR, a new Miscanthus crop growth model: towards more robust yield predictions under different climatic and soil conditions , 2009 .

[21]  John Clifton-Brown,et al.  Miscanthus : European experience with a novel energy crop , 2000 .

[22]  C. Bauer,et al.  Key Elements in a Framework for Land Use Impact Assessment Within LCA (11 pp) , 2007 .

[23]  Ward N. Smith,et al.  A tool to link agricultural activity data with the DNDC model to estimate GHG emission factors in Canada , 2010 .

[24]  David Makowski,et al.  Bayesian calibration of the nitrous oxide emission module of an agro-ecosystem model , 2009 .

[25]  I. Mitsios,et al.  Potential growth and biomass productivity of Miscanthus×giganteus as affected by plant density and N-fertilization in central Greece , 2007 .

[26]  R. Dickinson,et al.  Couplings between changes in the climate system and biogeochemistry , 2007 .

[27]  J. R. Kiniry,et al.  CERES-Maize: a simulation model of maize growth and development , 1986 .

[28]  E. Cowling,et al.  The Nitrogen Cascade , 2003 .

[29]  Benoit Gabrielle,et al.  Predicting the net carbon exchanges of crop rotations in Europe with an agro-ecosystem model , 2010 .

[30]  Sabine Houot,et al.  Field-scale modelling of carbon and nitrogen dynamics in soils amended with urban waste composts , 2005 .

[31]  Benoit Gabrielle,et al.  Life-cycle assessment of straw use in bio-ethanol production: a case study based on biophysical modelling. , 2008 .

[32]  B. Gabrielle,et al.  Simulation of Nitrous Oxide Emissions from Wheat-cropped Soils using CERES , 2006, Nutrient Cycling in Agroecosystems.

[33]  Andrew B. Riche,et al.  Growth, yield and mineral content of Miscanthus × giganteus grown as a biofuel for 14 successive harvests , 2008 .

[34]  Petter Medeiros,et al.  Modifications et developpement d'un nouveau module contrainte hydrique dans le modele ceres-sorghum sucrier , 1997 .

[35]  S. Polasky,et al.  Land Clearing and the Biofuel Carbon Debt , 2008, Science.

[36]  B. Mary,et al.  Using a crop model to account for the effects of local factors on the LCA of sugar beet ethanol in Picardy region, France , 2012, The International Journal of Life Cycle Assessment.

[37]  J. Lammel,et al.  Cultivation of Miscanthus under West European conditions: Seasonal changes in dry matter production, nutrient uptake and remobilization , 1997, Plant and Soil.

[38]  Keith A. Smith,et al.  N 2 O release from agro-biofuel production negates global warming reduction by replacing fossil fuels , 2007 .

[39]  John Clifton-Brown,et al.  Carbon mitigation by the energy crop, Miscanthus , 2007 .

[40]  Steve Frolking,et al.  A model of nitrous oxide evolution from soil driven by rainfall events: 2. Model applications , 1992 .

[41]  W. Parton,et al.  Generalized model for N2 and N2O production from nitrification and denitrification , 1996 .

[42]  R. Stenger,et al.  Comparison of N2O emissions from soils at three temperate agricultural sites: simulations of year-round measurements by four models , 1998, Nutrient Cycling in Agroecosystems.

[43]  Anders Hammer Strømman,et al.  Life cycle assessment of bioenergy systems: state of the art and future challenges. , 2011, Bioresource technology.

[44]  Benoit Gabrielle,et al.  Process‐based modeling of nitrous oxide emissions from wheat‐cropped soils at the subregional scale , 2006 .

[45]  P Laville,et al.  High-resolution inventory of NO emissions from agricultural soils over the Ile-de-France region. , 2010, Environmental pollution.

[46]  Fausto Freire,et al.  Life-cycle studies of biodiesel in Europe: A review addressing the variability of results and modeling issues , 2011 .

[47]  C. A. Jones,et al.  Epic - a Model for Assessing the Effects of Erosion on Soil Productivity1 , 1983 .

[48]  H. Ding,et al.  Comparison of three modeling approaches for simulating denitrification and nitrous oxide emissions from loam‐textured arable soils , 2005 .

[49]  A. Hastings,et al.  Potential of Miscanthus grasses to provide energy and hence reduce greenhouse gas emissions , 2008, Agronomy for Sustainable Development.

[50]  S. Recous,et al.  STICS : a generic model for the simulation of crops and their water and nitrogen balances. I. Theory, and parameterization applied to wheat and corn , 1998 .

[51]  G. Francis,et al.  Improving Estimates of Nitrate Leaching for Quantifying New Zealand’s Indirect Nitrous Oxide Emissions , 2005, Nutrient Cycling in Agroecosystems.

[52]  R. Clift,et al.  Soil Organic Carbon Changes in the Cultivation of Energy Crops: Implications for GHG Balances and Soil Quality for Use in LCA , 2011 .

[53]  B. Mary,et al.  Modelling soil compaction impacts on nitrous oxide emissions in arable fields , 2010 .

[54]  Adrian Leip,et al.  Developing spatially stratified N(2)O emission factors for Europe. , 2011, Environmental pollution.

[55]  Benoit Gabrielle,et al.  Analysis and Field Evaluation of the Ceres Models Water Balance Component , 1995 .

[56]  B. Gabrielle,et al.  CERES-beet, a prediction model for sugar beet yield and environmental impact. , 2003 .

[57]  Hans-Jürgen Dr. Klüppel,et al.  The Revision of ISO Standards 14040-3 - ISO 14040: Environmental management – Life cycle assessment – Principles and framework - ISO 14044: Environmental management – Life cycle assessment – Requirements and guidelines , 2005 .

[58]  Iris Lewandowski,et al.  Delayed harvest of miscanthus—influences on biomass quantity and quality and environmental impacts of energy production , 2003 .

[59]  Llorenç Milà i Canals,et al.  Method for assessing impacts on life support functions (LSF) related to the use of ‘fertile land’ in Life Cycle Assessment (LCA) , 2007 .

[60]  J. Webb,et al.  Modelling Nitrogen Fluxes at the Landscape Scale , 2004 .

[61]  Cécile Bessou,et al.  Greenhouse gas emissions of biofuels: Improving Life Cycle Assessments by taking into account local production factors , 2010 .

[62]  Andreas Schwen,et al.  Emission of groundwater‐derived nitrous oxide into the atmosphere: model simulations based on a 15N field experiment , 2011 .

[63]  Markus Kempen,et al.  Linking an economic model for European agriculture with a mechanistic model to estimate nitrogen and carbon losses from arable soils in Europe , 2008 .

[64]  E. Stehfest,et al.  N2O and NO emission from agricultural fields and soils under natural vegetation: summarizing available measurement data and modeling of global annual emissions , 2006, Nutrient Cycling in Agroecosystems.

[65]  Gabriele Curci,et al.  Biophysical modelling of NO emissions from agricultural soils in northern France for use in regional chemistry-transport modelling , 2008 .

[66]  Wenzhi Song,et al.  Comparing a process-based agro-ecosystem model to the IPCC methodology for developing a national inventory of N2O emissions from arable lands in China , 2001, Nutrient Cycling in Agroecosystems.

[67]  Peter Bergamaschi,et al.  Estimation of N2O fluxes at the regional scale: data, models, challenges , 2011 .

[68]  Pierre Cellier,et al.  Influence of short-term transfers on nitrogen fluxes, budgets and indirect N 2 O emissions in rural landscapes , 2011 .

[69]  Kristian Kristensen,et al.  Carbon sequestration in soil beneath long-term Miscanthus plantations as determined by 13C abundance , 2004 .