@article{
 title = {Full accounting of the greenhouse gas (CO2, N2O, CH4) budget of nine European grassland sites},
 type = {article},
 year = {2007},
 keywords = {Carbon sequestration,Livestock,Methane,Nitrogen cycle,Nitrous oxide},
 pages = {121-134},
 volume = {121},
 id = {3877cc1d-9373-3f5b-9ee8-8c54553d3610},
 created = {2018-01-18T16:07:29.098Z},
 file_attached = {false},
 profile_id = {5c1040db-25e3-36ea-a919-0994a44709e7},
 group_id = {c4af41cc-7e3c-3fd3-9982-bdb923596eee},
 last_modified = {2021-02-11T10:41:49.460Z},
 read = {false},
 starred = {false},
 authored = {false},
 confirmed = {true},
 hidden = {false},
 citation_key = {Soussana2007},
 private_publication = {false},
 abstract = {The full greenhouse gas balance of nine contrasted grassland sites covering a major climatic gradient over Europe was measured during two complete years. The sites include a wide range of management regimes (rotational grazing, continuous grazing and mowing), the three main types of managed grasslands across Europe (sown, intensive permanent and semi-natural grassland) and contrasted nitrogen fertilizer supplies. At all sites, the net ecosystem exchange (NEE) of CO2was assessed using the eddy covariance technique. N2O emissions were monitored using various techniques (GC-cuvette systems, automated chambers and tunable diode laser) and CH4emissions resulting from enteric fermentation of the grazing cattle were measured in situ at four sites using the SF6tracer method. Averaged over the two measurement years, net ecosystem exchange (NEE) results show that the nine grassland plots displayed a net sink for atmospheric CO2of -240 ± 70 g C m-2year-1(mean ± confidence interval at p > 0.95). Because of organic C exports (from cut and removed herbage) being usually greater than C imports (from manure spreading), the average C storage (net biome productivity, NBP) in the grassland plots was estimated at -104 ± 73 g C m-2year-1, that is 43% of the atmospheric CO2sink. On average of the 2 years, the grassland plots displayed annual N2O and CH4(from enteric fermentation by grazing cattle) emissions, in CO2-C equivalents, of 14 ± 4.7 and 32 ± 6.8 g CO2-C equiv. m-2year-1, respectively. Hence, when expressed in CO2-C equivalents, emissions of N2O and CH4resulted in a 19% offset of the NEE sink activity. An attributed GHG balance has been calculated by subtracting from the NBP: (i) N2O and CH4emissions occurring within the grassland plot and (ii) off-site emissions of CO2and CH4as a result of the digestion and enteric fermentation by cattle of the cut herbage. On average of the nine sites, the attributed GHG balance was not significantly different from zero (-85 ± 77 g CO2-C equiv. m-2year-1). The net exchanges by the grassland ecosystems of CO2and of GHG were highly correlated with the difference in carbon used by grazing versus cutting, indicating that cut grasslands have a greater on-site sink activity than grazed grasslands. However, the net biome productivity was significantly correlated to the total C used by grazing and cutting, indicating that, on average, net carbon storage declines with herbage utilisation for herbivores. © 2006 Elsevier B.V. All rights reserved.},
 bibtype = {article},
 author = {Soussana, J. F. and Allard, V. and Pilegaard, K. and Ambus, P. and Amman, C. and Campbell, C. and Ceschia, Eric and Clifton-Brown, J. and Czobel, S. and Domingues, R. and Flechard, C. R. and Fuhrer, J. and Hensen, A. and Horvath, L. and Jones, M. and Kasper, G. and Martin, C. and Nagy, Z. and Neftel, A. and Raschi, A. and Baronti, S. and Rees, R. M. and Skiba, U. and Stefani, P. and Manca, G. and Sutton, M. and Tuba, Z. and Valentini, R.},
 doi = {10.1016/j.agee.2006.12.022},
 journal = {Agriculture, Ecosystems and Environment},
 number = {1-2}
}

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The sites include a wide range of management regimes (rotational grazing, continuous grazing and mowing), the three main types of managed grasslands across Europe (sown, intensive permanent and semi-natural grassland) and contrasted nitrogen fertilizer supplies. At all sites, the net ecosystem exchange (NEE) of CO2was assessed using the eddy covariance technique. N2O emissions were monitored using various techniques (GC-cuvette systems, automated chambers and tunable diode laser) and CH4emissions resulting from enteric fermentation of the grazing cattle were measured in situ at four sites using the SF6tracer method. Averaged over the two measurement years, net ecosystem exchange (NEE) results show that the nine grassland plots displayed a net sink for atmospheric CO2of -240 ± 70 g C m-2year-1(mean ± confidence interval at p > 0.95). Because of organic C exports (from cut and removed herbage) being usually greater than C imports (from manure spreading), the average C storage (net biome productivity, NBP) in the grassland plots was estimated at -104 ± 73 g C m-2year-1, that is 43% of the atmospheric CO2sink. On average of the 2 years, the grassland plots displayed annual N2O and CH4(from enteric fermentation by grazing cattle) emissions, in CO2-C equivalents, of 14 ± 4.7 and 32 ± 6.8 g CO2-C equiv. m-2year-1, respectively. Hence, when expressed in CO2-C equivalents, emissions of N2O and CH4resulted in a 19% offset of the NEE sink activity. An attributed GHG balance has been calculated by subtracting from the NBP: (i) N2O and CH4emissions occurring within the grassland plot and (ii) off-site emissions of CO2and CH4as a result of the digestion and enteric fermentation by cattle of the cut herbage. On average of the nine sites, the attributed GHG balance was not significantly different from zero (-85 ± 77 g CO2-C equiv. m-2year-1). The net exchanges by the grassland ecosystems of CO2and of GHG were highly correlated with the difference in carbon used by grazing versus cutting, indicating that cut grasslands have a greater on-site sink activity than grazed grasslands. However, the net biome productivity was significantly correlated to the total C used by grazing and cutting, indicating that, on average, net carbon storage declines with herbage utilisation for herbivores. © 2006 Elsevier B.V. All rights reserved.","bibtype":"article","author":"Soussana, J. F. and Allard, V. and Pilegaard, K. and Ambus, P. and Amman, C. and Campbell, C. and Ceschia, Eric and Clifton-Brown, J. and Czobel, S. and Domingues, R. and Flechard, C. R. and Fuhrer, J. and Hensen, A. and Horvath, L. and Jones, M. and Kasper, G. and Martin, C. and Nagy, Z. and Neftel, A. and Raschi, A. and Baronti, S. and Rees, R. M. and Skiba, U. and Stefani, P. and Manca, G. and Sutton, M. and Tuba, Z. and Valentini, R.","doi":"10.1016/j.agee.2006.12.022","journal":"Agriculture, Ecosystems and Environment","number":"1-2","bibtex":"@article{\n title = {Full accounting of the greenhouse gas (CO2, N2O, CH4) budget of nine European grassland sites},\n type = {article},\n year = {2007},\n keywords = {Carbon sequestration,Livestock,Methane,Nitrogen cycle,Nitrous oxide},\n pages = {121-134},\n volume = {121},\n id = {3877cc1d-9373-3f5b-9ee8-8c54553d3610},\n created = {2018-01-18T16:07:29.098Z},\n file_attached = {false},\n profile_id = {5c1040db-25e3-36ea-a919-0994a44709e7},\n group_id = {c4af41cc-7e3c-3fd3-9982-bdb923596eee},\n last_modified = {2021-02-11T10:41:49.460Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n citation_key = {Soussana2007},\n private_publication = {false},\n abstract = {The full greenhouse gas balance of nine contrasted grassland sites covering a major climatic gradient over Europe was measured during two complete years. 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Because of organic C exports (from cut and removed herbage) being usually greater than C imports (from manure spreading), the average C storage (net biome productivity, NBP) in the grassland plots was estimated at -104 ± 73 g C m-2year-1, that is 43% of the atmospheric CO2sink. On average of the 2 years, the grassland plots displayed annual N2O and CH4(from enteric fermentation by grazing cattle) emissions, in CO2-C equivalents, of 14 ± 4.7 and 32 ± 6.8 g CO2-C equiv. m-2year-1, respectively. Hence, when expressed in CO2-C equivalents, emissions of N2O and CH4resulted in a 19% offset of the NEE sink activity. An attributed GHG balance has been calculated by subtracting from the NBP: (i) N2O and CH4emissions occurring within the grassland plot and (ii) off-site emissions of CO2and CH4as a result of the digestion and enteric fermentation by cattle of the cut herbage. On average of the nine sites, the attributed GHG balance was not significantly different from zero (-85 ± 77 g CO2-C equiv. m-2year-1). The net exchanges by the grassland ecosystems of CO2and of GHG were highly correlated with the difference in carbon used by grazing versus cutting, indicating that cut grasslands have a greater on-site sink activity than grazed grasslands. However, the net biome productivity was significantly correlated to the total C used by grazing and cutting, indicating that, on average, net carbon storage declines with herbage utilisation for herbivores. © 2006 Elsevier B.V. All rights reserved.},\n bibtype = {article},\n author = {Soussana, J. F. and Allard, V. and Pilegaard, K. and Ambus, P. and Amman, C. and Campbell, C. and Ceschia, Eric and Clifton-Brown, J. and Czobel, S. and Domingues, R. and Flechard, C. 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