Isolating the effect of soil properties on agricultural soil greenhouse gas emissions under controlled conditions

G A Miller, RM Rees, BS Griffiths, JM Cloy

Research output: Contribution to journalArticle

Abstract

Agricultural soils are important sources of greenhouse gases (GHGs). Soil properties and environmental factors have complex interactions which influence the dynamics of these GHG fluxes. Four arable and five grassland soils which represent the range of soil textures and climatic conditions of the main agricultural areas in the UK were incubated at two different moisture contents (50 or 80 % water holding capacity) and with or without inorganic fertiliser application (70 kg N ha-1 ammonium nitrate) over 22 days. Emissions of N2O, CO2 and CH4 were measured twice per week by headspace gas sampling and cumulative fluxes were calculated. Multiple regression modelling was carried out to determine which factors (soil mineral N, organic carbon and total nitrogen contents, C:N ratios, clay contents and pH) that best explained the variation in GHG fluxes. Clay, mineral N and soil C contents were found to be the most important explanatory variables controlling GHG fluxes in this study. However, none of the measured variables explained a significant amount of variation in CO2 fluxes from the arable soils. The results were generally consistent with previously published work. However, N2O emissions from the two Scottish soils were substantially more sensitive to inorganic N fertilisation at 80% water holding capacity than the other soils, with the N2O emissions being up to 107 times higher than the other studied soils.
Original languageEnglish
JournalSoil Use and Management
Early online date4 Oct 2019
DOIs
Publication statusFirst published - 4 Oct 2019

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soil gas
greenhouse gases
greenhouse gas emissions
agricultural soils
Gas emissions
Greenhouse gases
agricultural soil
soil properties
soil property
greenhouse gas
nitrous oxide
Soils
water holding capacity
soil
carbon dioxide
Fluxes
grassland soils
clay minerals
ammonium nitrate
arable soils

Keywords

  • GHG emissions
  • agricultural soils
  • inorganic fertiliser

Cite this

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title = "Isolating the effect of soil properties on agricultural soil greenhouse gas emissions under controlled conditions",
abstract = "Agricultural soils are important sources of greenhouse gases (GHGs). Soil properties and environmental factors have complex interactions which influence the dynamics of these GHG fluxes. Four arable and five grassland soils which represent the range of soil textures and climatic conditions of the main agricultural areas in the UK were incubated at two different moisture contents (50 or 80 {\%} water holding capacity) and with or without inorganic fertiliser application (70 kg N ha-1 ammonium nitrate) over 22 days. Emissions of N2O, CO2 and CH4 were measured twice per week by headspace gas sampling and cumulative fluxes were calculated. Multiple regression modelling was carried out to determine which factors (soil mineral N, organic carbon and total nitrogen contents, C:N ratios, clay contents and pH) that best explained the variation in GHG fluxes. Clay, mineral N and soil C contents were found to be the most important explanatory variables controlling GHG fluxes in this study. However, none of the measured variables explained a significant amount of variation in CO2 fluxes from the arable soils. The results were generally consistent with previously published work. However, N2O emissions from the two Scottish soils were substantially more sensitive to inorganic N fertilisation at 80{\%} water holding capacity than the other soils, with the N2O emissions being up to 107 times higher than the other studied soils.",
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year = "2019",
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T1 - Isolating the effect of soil properties on agricultural soil greenhouse gas emissions under controlled conditions

AU - Miller, G A

AU - Rees, RM

AU - Griffiths, BS

AU - Cloy, JM

PY - 2019/10/4

Y1 - 2019/10/4

N2 - Agricultural soils are important sources of greenhouse gases (GHGs). Soil properties and environmental factors have complex interactions which influence the dynamics of these GHG fluxes. Four arable and five grassland soils which represent the range of soil textures and climatic conditions of the main agricultural areas in the UK were incubated at two different moisture contents (50 or 80 % water holding capacity) and with or without inorganic fertiliser application (70 kg N ha-1 ammonium nitrate) over 22 days. Emissions of N2O, CO2 and CH4 were measured twice per week by headspace gas sampling and cumulative fluxes were calculated. Multiple regression modelling was carried out to determine which factors (soil mineral N, organic carbon and total nitrogen contents, C:N ratios, clay contents and pH) that best explained the variation in GHG fluxes. Clay, mineral N and soil C contents were found to be the most important explanatory variables controlling GHG fluxes in this study. However, none of the measured variables explained a significant amount of variation in CO2 fluxes from the arable soils. The results were generally consistent with previously published work. However, N2O emissions from the two Scottish soils were substantially more sensitive to inorganic N fertilisation at 80% water holding capacity than the other soils, with the N2O emissions being up to 107 times higher than the other studied soils.

AB - Agricultural soils are important sources of greenhouse gases (GHGs). Soil properties and environmental factors have complex interactions which influence the dynamics of these GHG fluxes. Four arable and five grassland soils which represent the range of soil textures and climatic conditions of the main agricultural areas in the UK were incubated at two different moisture contents (50 or 80 % water holding capacity) and with or without inorganic fertiliser application (70 kg N ha-1 ammonium nitrate) over 22 days. Emissions of N2O, CO2 and CH4 were measured twice per week by headspace gas sampling and cumulative fluxes were calculated. Multiple regression modelling was carried out to determine which factors (soil mineral N, organic carbon and total nitrogen contents, C:N ratios, clay contents and pH) that best explained the variation in GHG fluxes. Clay, mineral N and soil C contents were found to be the most important explanatory variables controlling GHG fluxes in this study. However, none of the measured variables explained a significant amount of variation in CO2 fluxes from the arable soils. The results were generally consistent with previously published work. However, N2O emissions from the two Scottish soils were substantially more sensitive to inorganic N fertilisation at 80% water holding capacity than the other soils, with the N2O emissions being up to 107 times higher than the other studied soils.

KW - GHG emissions

KW - agricultural soils

KW - inorganic fertiliser

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JO - Soil Use and Management

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SN - 0266-0032

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