The nitrogen, carbon and greenhouse gas budget of a grazed, cut and fertilised temperate grassland

SK Jones, C Helfter, M Anderson, M Coyle, C Campbell, D Famulari, C Di Marco, N van Dijk, YS Tang, CFE Topp, R Kiese, R Kindler, J Siemens, M Schrumpf, K Kaiser, E Nemitz, PE Levy, RM Rees, MA Sutton, UM Skiba

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Abstract

Intensively managed grazed grasslands in temperate climates are globally important environments for the exchange of the greenhouse gases (GHGs) carbon dioxide (CO2), nitrous oxide (N2O) and methane (CH4). We assessed the N and C budget of a mostly grazed and occasionally cut and fertilised grassland in SE Scotland by measuring or modelling all relevant imports and exports to the field as well as changes in soil C and N stocks over time. The N budget was dominated by import from inorganic and organic fertilisers (21.9 g N m−2 a−1) and losses from leaching (5.3 g N m−2 a−1), N2 emissions (2.9 g N m−2 a−1), and NOx and NH3 volatilisation (3.9 g N m−2 a−1), while N2O emission was only 0.6 g N m−2 a−1. The efficiency of N use by animal products (meat and wool) averaged 9.9 % of total N input over only-grazed years (2004–2010). On average over 9 years (2002–2010), the balance of N fluxes suggested that 6.0 ± 5.9 g N m−2 a−1 (mean ± confidence interval at p > 0.95) were stored in the soil. The largest component of the C budget was the net ecosystem exchange of CO2 (NEE), at an average uptake rate of 218 ± 155 g C m−2 a−1 over the 9 years. This sink strength was offset by carbon export from the field mainly as grass offtake for silage (48.9 g C m−2 a−1) and leaching (16.4 g C m−2 a−1). The other export terms, CH4 emissions from the soil, manure applications and enteric fermentation, were negligible and only contributed to 0.02–4.2 % of the total C losses. Only a small fraction of C was incorporated into the body of the grazing animals. Inclusion of these C losses in the budget resulted in a C sink strength of 163 ± 140 g C m−2 a−1. By contrast, soil stock measurements taken in May 2004 and May 2011 indicated that the grassland sequestered N in the 0–60 cm soil layer at 4.51 ± 2.64 g N m−2 a−1 and lost C at a rate of 29.08 ± 38.19 g C m−2 a−1. Potential reasons for the discrepancy between these estimates are probably an underestimation of C losses, especially from leaching fluxes as well as from animal respiration. The average greenhouse gas (GHG) balance of the grassland was −366 ± 601 g CO2 eq. m−2 yr−1 and was strongly affected by CH4 and N2O emissions. The GHG sink strength of the NEE was reduced by 54 % by CH4 and N2O emissions. Estimated enteric fermentation from ruminating sheep proved to be an important CH4 source, exceeding the contribution of N2O to the GHG budget in some years.
Original languageEnglish
Pages (from-to)2069 - 2088
Number of pages20
JournalBiogeosciences
Volume14
Issue number8
Early online date24 Apr 2017
DOIs
Publication statusFirst published - 24 Apr 2017

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greenhouse gas
grassland
nitrogen
carbon
net ecosystem exchange
leaching
fermentation
import
soil
animal product
silage
animal
wool
volatilization
nitrous oxide
meat
sheep
confidence interval
manure
respiration

Bibliographical note

1020855

Keywords

  • Budget
  • Carbon sequestration
  • Carbon stocks
  • Grassland
  • Greenhouse gases
  • Nitrogen cycling

Cite this

Jones, SK., Helfter, C., Anderson, M., Coyle, M., Campbell, C., Famulari, D., ... Skiba, UM. (2017). The nitrogen, carbon and greenhouse gas budget of a grazed, cut and fertilised temperate grassland. Biogeosciences, 14(8), 2069 - 2088. https://doi.org/10.5194/bg-14-2069-2017
Jones, SK ; Helfter, C ; Anderson, M ; Coyle, M ; Campbell, C ; Famulari, D ; Di Marco, C ; van Dijk, N ; Tang, YS ; Topp, CFE ; Kiese, R ; Kindler, R ; Siemens, J ; Schrumpf, M ; Kaiser, K ; Nemitz, E ; Levy, PE ; Rees, RM ; Sutton, MA ; Skiba, UM. / The nitrogen, carbon and greenhouse gas budget of a grazed, cut and fertilised temperate grassland. In: Biogeosciences. 2017 ; Vol. 14, No. 8. pp. 2069 - 2088.
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abstract = "Intensively managed grazed grasslands in temperate climates are globally important environments for the exchange of the greenhouse gases (GHGs) carbon dioxide (CO2), nitrous oxide (N2O) and methane (CH4). We assessed the N and C budget of a mostly grazed and occasionally cut and fertilised grassland in SE Scotland by measuring or modelling all relevant imports and exports to the field as well as changes in soil C and N stocks over time. The N budget was dominated by import from inorganic and organic fertilisers (21.9 g N m−2 a−1) and losses from leaching (5.3 g N m−2 a−1), N2 emissions (2.9 g N m−2 a−1), and NOx and NH3 volatilisation (3.9 g N m−2 a−1), while N2O emission was only 0.6 g N m−2 a−1. The efficiency of N use by animal products (meat and wool) averaged 9.9 {\%} of total N input over only-grazed years (2004–2010). On average over 9 years (2002–2010), the balance of N fluxes suggested that 6.0 ± 5.9 g N m−2 a−1 (mean ± confidence interval at p > 0.95) were stored in the soil. The largest component of the C budget was the net ecosystem exchange of CO2 (NEE), at an average uptake rate of 218 ± 155 g C m−2 a−1 over the 9 years. This sink strength was offset by carbon export from the field mainly as grass offtake for silage (48.9 g C m−2 a−1) and leaching (16.4 g C m−2 a−1). The other export terms, CH4 emissions from the soil, manure applications and enteric fermentation, were negligible and only contributed to 0.02–4.2 {\%} of the total C losses. Only a small fraction of C was incorporated into the body of the grazing animals. Inclusion of these C losses in the budget resulted in a C sink strength of 163 ± 140 g C m−2 a−1. By contrast, soil stock measurements taken in May 2004 and May 2011 indicated that the grassland sequestered N in the 0–60 cm soil layer at 4.51 ± 2.64 g N m−2 a−1 and lost C at a rate of 29.08 ± 38.19 g C m−2 a−1. Potential reasons for the discrepancy between these estimates are probably an underestimation of C losses, especially from leaching fluxes as well as from animal respiration. The average greenhouse gas (GHG) balance of the grassland was −366 ± 601 g CO2 eq. m−2 yr−1 and was strongly affected by CH4 and N2O emissions. The GHG sink strength of the NEE was reduced by 54 {\%} by CH4 and N2O emissions. Estimated enteric fermentation from ruminating sheep proved to be an important CH4 source, exceeding the contribution of N2O to the GHG budget in some years.",
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Jones, SK, Helfter, C, Anderson, M, Coyle, M, Campbell, C, Famulari, D, Di Marco, C, van Dijk, N, Tang, YS, Topp, CFE, Kiese, R, Kindler, R, Siemens, J, Schrumpf, M, Kaiser, K, Nemitz, E, Levy, PE, Rees, RM, Sutton, MA & Skiba, UM 2017, 'The nitrogen, carbon and greenhouse gas budget of a grazed, cut and fertilised temperate grassland', Biogeosciences, vol. 14, no. 8, pp. 2069 - 2088. https://doi.org/10.5194/bg-14-2069-2017

The nitrogen, carbon and greenhouse gas budget of a grazed, cut and fertilised temperate grassland. / Jones, SK; Helfter, C; Anderson, M; Coyle, M; Campbell, C; Famulari, D; Di Marco, C; van Dijk, N; Tang, YS; Topp, CFE; Kiese, R; Kindler, R; Siemens, J; Schrumpf, M; Kaiser, K; Nemitz, E; Levy, PE; Rees, RM; Sutton, MA; Skiba, UM.

In: Biogeosciences, Vol. 14, No. 8, 24.04.2017, p. 2069 - 2088.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The nitrogen, carbon and greenhouse gas budget of a grazed, cut and fertilised temperate grassland

AU - Jones, SK

AU - Helfter, C

AU - Anderson, M

AU - Coyle, M

AU - Campbell, C

AU - Famulari, D

AU - Di Marco, C

AU - van Dijk, N

AU - Tang, YS

AU - Topp, CFE

AU - Kiese, R

AU - Kindler, R

AU - Siemens, J

AU - Schrumpf, M

AU - Kaiser, K

AU - Nemitz, E

AU - Levy, PE

AU - Rees, RM

AU - Sutton, MA

AU - Skiba, UM

N1 - 1020855

PY - 2017/4/24

Y1 - 2017/4/24

N2 - Intensively managed grazed grasslands in temperate climates are globally important environments for the exchange of the greenhouse gases (GHGs) carbon dioxide (CO2), nitrous oxide (N2O) and methane (CH4). We assessed the N and C budget of a mostly grazed and occasionally cut and fertilised grassland in SE Scotland by measuring or modelling all relevant imports and exports to the field as well as changes in soil C and N stocks over time. The N budget was dominated by import from inorganic and organic fertilisers (21.9 g N m−2 a−1) and losses from leaching (5.3 g N m−2 a−1), N2 emissions (2.9 g N m−2 a−1), and NOx and NH3 volatilisation (3.9 g N m−2 a−1), while N2O emission was only 0.6 g N m−2 a−1. The efficiency of N use by animal products (meat and wool) averaged 9.9 % of total N input over only-grazed years (2004–2010). On average over 9 years (2002–2010), the balance of N fluxes suggested that 6.0 ± 5.9 g N m−2 a−1 (mean ± confidence interval at p > 0.95) were stored in the soil. The largest component of the C budget was the net ecosystem exchange of CO2 (NEE), at an average uptake rate of 218 ± 155 g C m−2 a−1 over the 9 years. This sink strength was offset by carbon export from the field mainly as grass offtake for silage (48.9 g C m−2 a−1) and leaching (16.4 g C m−2 a−1). The other export terms, CH4 emissions from the soil, manure applications and enteric fermentation, were negligible and only contributed to 0.02–4.2 % of the total C losses. Only a small fraction of C was incorporated into the body of the grazing animals. Inclusion of these C losses in the budget resulted in a C sink strength of 163 ± 140 g C m−2 a−1. By contrast, soil stock measurements taken in May 2004 and May 2011 indicated that the grassland sequestered N in the 0–60 cm soil layer at 4.51 ± 2.64 g N m−2 a−1 and lost C at a rate of 29.08 ± 38.19 g C m−2 a−1. Potential reasons for the discrepancy between these estimates are probably an underestimation of C losses, especially from leaching fluxes as well as from animal respiration. The average greenhouse gas (GHG) balance of the grassland was −366 ± 601 g CO2 eq. m−2 yr−1 and was strongly affected by CH4 and N2O emissions. The GHG sink strength of the NEE was reduced by 54 % by CH4 and N2O emissions. Estimated enteric fermentation from ruminating sheep proved to be an important CH4 source, exceeding the contribution of N2O to the GHG budget in some years.

AB - Intensively managed grazed grasslands in temperate climates are globally important environments for the exchange of the greenhouse gases (GHGs) carbon dioxide (CO2), nitrous oxide (N2O) and methane (CH4). We assessed the N and C budget of a mostly grazed and occasionally cut and fertilised grassland in SE Scotland by measuring or modelling all relevant imports and exports to the field as well as changes in soil C and N stocks over time. The N budget was dominated by import from inorganic and organic fertilisers (21.9 g N m−2 a−1) and losses from leaching (5.3 g N m−2 a−1), N2 emissions (2.9 g N m−2 a−1), and NOx and NH3 volatilisation (3.9 g N m−2 a−1), while N2O emission was only 0.6 g N m−2 a−1. The efficiency of N use by animal products (meat and wool) averaged 9.9 % of total N input over only-grazed years (2004–2010). On average over 9 years (2002–2010), the balance of N fluxes suggested that 6.0 ± 5.9 g N m−2 a−1 (mean ± confidence interval at p > 0.95) were stored in the soil. The largest component of the C budget was the net ecosystem exchange of CO2 (NEE), at an average uptake rate of 218 ± 155 g C m−2 a−1 over the 9 years. This sink strength was offset by carbon export from the field mainly as grass offtake for silage (48.9 g C m−2 a−1) and leaching (16.4 g C m−2 a−1). The other export terms, CH4 emissions from the soil, manure applications and enteric fermentation, were negligible and only contributed to 0.02–4.2 % of the total C losses. Only a small fraction of C was incorporated into the body of the grazing animals. Inclusion of these C losses in the budget resulted in a C sink strength of 163 ± 140 g C m−2 a−1. By contrast, soil stock measurements taken in May 2004 and May 2011 indicated that the grassland sequestered N in the 0–60 cm soil layer at 4.51 ± 2.64 g N m−2 a−1 and lost C at a rate of 29.08 ± 38.19 g C m−2 a−1. Potential reasons for the discrepancy between these estimates are probably an underestimation of C losses, especially from leaching fluxes as well as from animal respiration. The average greenhouse gas (GHG) balance of the grassland was −366 ± 601 g CO2 eq. m−2 yr−1 and was strongly affected by CH4 and N2O emissions. The GHG sink strength of the NEE was reduced by 54 % by CH4 and N2O emissions. Estimated enteric fermentation from ruminating sheep proved to be an important CH4 source, exceeding the contribution of N2O to the GHG budget in some years.

KW - Budget

KW - Carbon sequestration

KW - Carbon stocks

KW - Grassland

KW - Greenhouse gases

KW - Nitrogen cycling

U2 - 10.5194/bg-14-2069-2017

DO - 10.5194/bg-14-2069-2017

M3 - Article

VL - 14

SP - 2069

EP - 2088

JO - Biogeosciences

JF - Biogeosciences

SN - 1726-4170

IS - 8

ER -