Filters








804 Hits in 5.9 sec

Information Properties of Boundary Line Models for N2O Emissions from Agricultural Soils

Cairistiona Topp, Weijin Wang, Joanna Cloy, Robert Rees, Gareth Hughes
2013 Entropy  
Boundary line models for N 2 O emissions from agricultural soils provide a means of estimating emissions within defined ranges.  ...  Writing the numerical results from graphical two-threshold boundary line models as 3×3 prediction-realization tables facilitates calculation of expected mutual information, a measure of the amount of information  ...  Acknowledgments The research on prediction of N 2 O emissions with the boundary line model was funded by the Department of Climate Change and Energy Efficiency (via ex-AGO), Australia.  ... 
doi:10.3390/e15030972 fatcat:ijgssh5bzrbfdcacrisq6tcv7m

Biochar suppresses N2O emissions while maintaining N availability in a sandy loam soil

Sean D.C. Case, Niall P. McNamara, David S. Reay, Andy W. Stott, Helen K. Grant, Jeanette Whitaker
2015 Soil Biology and Biochemistry  
Abstract 15 Nitrous oxide (N2O) from agricultural soil is a significant source of greenhouse gas emissions. 16 Biochar amendment can contribute to climate change mitigation by suppressing emissions of  ...  N2O 17 from soil, although the mechanisms underlying this effect are poorly understood.  ...  Agricultural land contributes approximately 38 60 % to global anthropogenic N2O emissions; new agricultural practices are therefore needed to 39 minimise soil N2O emissions and mitigate the effects of  ... 
doi:10.1016/j.soilbio.2014.11.012 fatcat:yzwtfdxqcjfepmmh5pqcp356je

Nitrous oxide emission sources from a mixed livestock farm

N.J. Cowan, P.E. Levy, D. Famulari, M. Anderson, D.S. Reay, U.M. Skiba
2017 Agriculture, Ecosystems & Environment  
6 The primary aim of this study was to identify and compare the most significant sources of nitrous oxide (N2O) 7 emissions from soils within a typical mixed livestock farm in Scotland.  ...  21 months when manure heaps and animal barns continue to produce emissions while soils reach temperatures 22 unfavourable for microbial activity (< 5 C). 23  ...  Using a boundary line approach to analyze N2O flux data 501 from agricultural soils. Nutr. Cycl.  ... 
doi:10.1016/j.agee.2017.04.014 fatcat:njrqvpiixrhxxjnilhif32kjhe

Optimizing Nitrogen and Residue Management to Reduce GHG Emissions while Maintaining Crop Yield: A Case Study in a Mono-Cropping System of Northeast China

Jianzheng Li, Zhongkui Luo, Yingchun Wang, Hu Li, Hongtao Xing, Ligang Wang, Enli Wang, Hui Xu, Chunyu Gao, Tianzhi Ren
2019 Sustainability  
emissions from nitrogen fertilizer input (production and transportation) and direct N2O emissions from soil accounted for the majority (~60% of GHGL).  ...  In this paper, the agricultural production system model (APSIM) was applied to assess the long-term variations of crop yield and soil GHG emissions in a maize mono-cropping system of NEC, and the simulation  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/su11185015 fatcat:6ubkmqsgt5agjlyqs3tbuxm7pe

Quantifying methane and nitrous oxide emissions from the UK and Ireland using a national-scale monitoring network

A. L. Ganesan, A. J. Manning, A. Grant, D. Young, D .E. Oram, W. T. Sturges, J. B. Moncrieff, S. O'Doherty
2015 Atmospheric Chemistry and Physics  
We inferred average model errors of approximately 20 and 0.4 ppb and correlation timescales of 1.0 (0.72–1.43) and 2.6 (1.9–3.9) days for CH<sub>4</sub> and N<sub>2</sub>O, respectively.  ...  In this study, we present top-down emissions of methane (CH<sub>4</sub>) and nitrous oxide (N<sub>2</sub>O) for the UK and Ireland over the period August~2012 to August~2014.  ...  This modeling study was funded by the UK Department of Energy and Climate Change  ... 
doi:10.5194/acp-15-6393-2015 fatcat:rpyjgbtswzgd5exnmwsfqkuyti

Carbon Footprint of Mediterranean Pasture-Based Native Beef: Effects of Agronomic Practices and Pasture Management under Different Climate Change Scenarios

Giampiero Grossi, Andrea Vitali, Nicola Lacetera, Pier Paolo Danieli, Umberto Bernabucci, Alessandro Nardone
2020 Animals  
A better understanding of soil organic carbon (SOC) dynamics is needed when assessing the carbon footprint (CFP) of livestock products and the effectiveness of possible agriculture mitigation strategies  ...  on SOC dynamics, N2O fluxes, and crop yield.  ...  Limited information exists about the possible impacts of CC on soil N 2 O emissions.  ... 
doi:10.3390/ani10030415 pmid:32131471 pmcid:PMC7143649 fatcat:bvx2tlr2jjdwljpyl2znxcow5i

Fraction of nitrous oxide production in nitrification and its effect on total soil emission: A meta-analysis and global-scale sensitivity analysis using a process-based model

Motoko Inatomi, Tomohiro Hajima, Akihiko Ito, Jianlin Shen
2019 PLoS ONE  
We corrected observational values of gross nitrification and associated N2O emission rates from 71 records for various soils in the world spanning from 0.006% to 29.5%.  ...  Using a process-based biogeochemical model, we conducted a series of sensitivity analyses for the effects of different values of nitrification-associated N2O emission fraction on soil N2O emission.  ...  To obtain information on the general properties of the parameter, we gathered observational values reported from a wide range of studies.  ... 
doi:10.1371/journal.pone.0219159 pmid:31291317 pmcid:PMC6619742 fatcat:ly2cftqn4vagfg67hlu6wyeoci

Intra- and inter-year variability of agricultural carbon footprints – A case study on field-grown tomatoes

Julie Clavreul, Isabela Butnar, Victor Rubio, Henry King
2017 Journal of Cleaner Production  
The performance of agricultural systems and their environmental impacts can vary considerably within a single crop supply chain, due to differences in farming practices, soil properties, and yearly climatic  ...  This study is the first to present an analysis of the intra-and inter-year variability of GHG emissions from tomato production and to demonstrate the influence of yearly weather conditions.  ...  The CFT uses the model by Bouwman et al. (2002) for estimating emissions of N2O, NO and NH3.  ... 
doi:10.1016/j.jclepro.2017.05.004 fatcat:tfpquy5pobgovnzenko4pn2nnq

Closing the N-Budget: How Simulated Groundwater-Borne Nitrate Supply Affects Plant Growth and Greenhouse Gas Emissions on Temperate Grassland

Ralf Liebermann, Lutz Breuer, Tobias Houska, Steffen Klatt, David Kraus, Edwin Haas, Christoph Müller, Philipp Kraft
2018 Atmosphere  
We also found that inputs of nitrate-rich groundwater increased the modelled nitrous oxide (N2O) emissions, while soil water content was not affected.  ...  Simulated plant nitrate uptake compensated the measured N deficit for 2 of 3 plots and lead to substantial improvements regarding the match between simulated and observed plant biomass and CO2 emission  ...  We would like to further acknowledge the financial support provided by the Deutsche Forschungsgemeinschaft (DFG) for Tobias Houska (BR2238/13-1) and for Edwin Haas (BU1173/12-1).  ... 
doi:10.3390/atmos9100407 fatcat:jfpizxdtsbb4blt23mvccasnbu

Measuring N2O Emissions from Multiple Sources Using a Backward Lagrangian Stochastic Model

Cheng-Hsien Lin, Richard H. Grant, Cliff T. Johnston
2020 Atmosphere  
Nitrous oxide (N2O) emissions from agricultural soil are substantially influenced by nitrogen (N) and field management practices.  ...  A scanning open-path Fourier-transform infrared spectrometer (OP-FTIR), edge-of-field gas sampling and measurement, locally measured turbulence, and bLS emissions modeling were integrated to measure N2O  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/atmos11121277 fatcat:ayxbaqqofbevbfpgnhmdnmjqzi

Ecological controls on N2O emission in surface litter and near-surface soil of a managed grassland: modelling and measurements

Robert F. Grant, Albrecht Neftel, Pierluigi Calanca
2016 Biogeosciences  
Modelled N<sub>2</sub>O emissions were also found to be sensitive to surface soil properties.  ...  </strong> Large variability in N<sub>2</sub>O emissions from managed grasslands may occur because most emissions originate in surface litter or near-surface soil where variability in soil water content  ...  Computational facilities for ecosys were provided by the University of Alberta and by the Compute Canada high-performance computing infrastructure.  ... 
doi:10.5194/bg-13-3549-2016 fatcat:ktmqwq537faenfr7iaom32zyi4

Effect of Biochar on Soil Greenhouse Gas Emissions at the Laboratory and Field Scales

Rivka Fidel, David Laird, Timothy Parkin
2019 Soil Systems  
Here we investigate the impact of a mixed wood gasification biochar on CO2 and N2O emissions from loess-derived soils using: (1) controlled laboratory incubations at three moisture (27, 31 and 35%) and  ...  Biochar application to soil has been proposed as a means for reducing soil greenhouse gas emissions and mitigating climate change.  ...  We furthermore thank Ken Moore for assistance with statistical analysis.  ... 
doi:10.3390/soilsystems3010008 fatcat:wfa2u3wdxvhwjijwkvtlpf4xxe

KGML-ag: a modeling framework of knowledge-guided machine learning to simulate agroecosystems: a case study of estimating N2O emission using data from mesocosm experiments

Licheng Liu, Shaoming Xu, Jinyun Tang, Kaiyu Guan, Timothy J. Griffis, Matthew D. Erickson, Alexander L. Frie, Xiaowei Jia, Taegon Kim, Lee T. Miller, Bin Peng, Shaowei Wu (+4 others)
2022 Geoscientific Model Development  
Agricultural nitrous oxide (N2O) emission accounts for a non-trivial fraction of global greenhouse gas (GHG) budget.  ...  Importantly, KGML-ag always outperforms the PB model and ML models in predicting N2O fluxes, especially for complex temporal dynamics and emission peaks.  ...  In this study, involving IMVs like O 2 , CO 2 and N 2 , which already have boundary information like water freezing point, N pool volumes and other complicated boundaries related to soil and crop properties  ... 
doi:10.5194/gmd-15-2839-2022 fatcat:fghj4gmgunfohf3ybw4tsoa3ze

Environmental life cycle assessments of producing maize, grass-clover, ryegrass and winter wheat straw for biorefinery

Ranjan Parajuli, Ib Sillebak Kristensen, Marie Trydeman Knudsen, Lisbeth Mogensen, Andrea Corona, Morten Birkved, Nancy Peña, Morten Graversgaard, Tommy Dalgaard
2017 Journal of Cleaner Production  
The higher 18 GWP for maize was partly due to soil C changes and nitrous oxide emissions.  ...  Nitrogen and phosphorous emission at field level contributed 72%-23 84% of the EP.  ...  hotspots assessments 9 About 43%-61% of the gross GWP100 (excluding the soil C change) is due to the contribution from N2O-N 10 emissions.  ... 
doi:10.1016/j.jclepro.2016.10.076 fatcat:ayosckrzcbcoxn7vdgnvqo36nu

On Upscaling of Soil Microbial Processes and Biogeochemical Fluxes From Aggregates to Landscapes

Ali Ebrahimi, Dani Or
2018 Journal of Geophysical Research - Biogeosciences  
The modeling framework was evaluated using reported field data for seasonal N 2 O emissions from subarctic regions resulting in reasonable agreement.  ...  The upscaling of microbial processes from aggregates of different sizes to soil profiles and landscapes implements mechanistically derived microbial response functions with spatial information on soil  ...  E. acknowledges funding from the Swiss National Science Foundation (SNSF grant P2EZP2_175128) during his stay at MIT.  ... 
doi:10.1029/2017jg004347 fatcat:wlwmhtmlg5bjbdrjcl35jdhmym
« Previous Showing results 1 — 15 out of 804 results