Ranking factors affecting emissions of GHG from incubated agricultural soils

S. Garcia-Marco, S. R. Ravella, D. Chadwick, A. Vallejo, A. S. Gregory, L. M. Cardenas*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Citations (SciVal)
142 Downloads (Pure)

Abstract

Agriculture significantly contributes to global greenhouse gas (GHG) emissions and there is a need to develop effective mitigation strategies. The efficacy of methods to reduce GHG fluxes from agricultural soils can be affected by a range of interacting management and environmental factors. Uniquely, we used the Taguchi experimental design methodology to rank the relative importance of six factors known to affect the emission of GHG from soil: nitrate (NO3−) addition, carbon quality (labile and non-labile C), soil temperature, water-filled pore space (WFPS) and extent of soil compaction. Grassland soil was incubated in jars where selected factors, considered at two or three amounts within the experimental range, were combined in an orthogonal array to determine the importance and interactions between factors with a L16 design, comprising 16 experimental units. Within this L16 design, 216 combinations of the full factorial experimental design were represented. Headspace nitrous oxide (N2O), methane (CH4) and carbon dioxide (CO2) concentrations were measured and used to calculate fluxes. Results found for the relative influence of factors (WFPS and NO3− addition were the main factors affecting N2O fluxes, whilst glucose, NO3− and soil temperature were the main factors affecting CO2 and CH4 fluxes) were consistent with those already well documented. Interactions between factors were also studied and results showed that factors with little individual influence became more influential in combination. The proposed methodology offers new possibilities for GHG researchers to study interactions between influential factors and address the optimized sets of conditions to reduce GHG emissions in agro-ecosystems, while reducing the number of experimental units required compared with conventional experimental procedures that adjust one variable at a time.
Original languageEnglish
Pages (from-to)573-583
Number of pages11
JournalEuropean Journal of Soil Science
Volume65
Issue number4
Early online date18 Jun 2014
DOIs
Publication statusPublished - 07 Jul 2014

Keywords

  • GREENHOUSE-GAS EMISSIONS
  • FERTILIZER NITROGEN
  • GASEOUS EMISSIONS
  • LAND-USE
  • TEMPERATURE
  • N2O
  • GRASSLAND
  • METHANE
  • NITRATE
  • FLUXES

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