Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 4 5 2007 10.5194/bg-4-803-2007 http://www.biogeosciences.net/4/803/2007/ http://www.biogeosciences.net/4/803/2007/bg-4-803-2007.html http://www.biogeosciences.net/4/803/2007/bg-4-803-2007.pdf 803 816 2007-10-08 Variability of annual CO2 exchange from Dutch grasslands C. M. J. Jacobs cor.jacobs@wur.nl A. F. G. Jacobs F. C. Bosveld D. M. D. Hendriks A. Hensen P. S. Kroon E. J. Moors L. Nol A. Schrier-Uijl E. M. Veenendaal Alterra, P.O. Box 47, 6700 AA Wageningen, The Netherlands Wageningen University, P.O. Box 47, 6700 AA Wageningen, The Netherlands KNMI, P.O. Box 201, 3730 AE De Bilt, The Netherlands Free University, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands ECN, Westerduinweg 3, 1755 LE Petten, The Netherlands Wageningen University, Nature Conservation and Plant Ecology Group, P.O. Box 47, 6700 AA Wageningen, The Netherlands An intercomparison is made of the Net Ecosystem Exchange of CO2, NEE, for eight Dutch grassland sites: four natural grasslands, two production grasslands and two meteorological stations within a rotational grassland region. At all sites the NEE was determined during at least 10 months per site, using the eddy-covariance (EC) technique, but in different years. The NEE does not include any import or export other than CO2. The photosynthesis-light response analysis technique is used along with the respiration-temperature response technique to partition NEE into Gross Primary Production (GPP) and Ecosystem Respiration (Re) and to obtain the eco-physiological characteristics of the sites at the field scale. Annual sums of NEE, GPP and Re are then estimated using the fitted response curves with observed radiation and air temperature from a meteorological site in the centre of The Netherlands as drivers. These calculations are carried out for four years (2002–2005). Land use and management histories are not considered. The estimated annual Re for all individual sites is more or less constant per site and the average for all sites amounts to 1390±30 gC m−2 a−1. The narrow uncertainty band (±2%) reflects the small differences in the mean annual air temperature. The mean annual GPP was estimated to be 1325 g C m−2 a−1, and displays a much higher standard deviation, of ±110 gC m−2 a−1 (8%), which reflects the relatively large variation in annual solar radiation. The mean annual NEE amounts to –65±85 gC m−2 a−1. From two sites, four-year records of CO2 flux were available and analyzed (2002–2005). Using the weather record of 2005 with optimizations from the other years, the standard deviation of annual GPP was estimated to be 171–206 gC m−2 a−1 (8–14%), of annual Re 227–247 gC m−2 a−1 (14–16%) and of annual NEE 176–276 gC m−2 a−1. The inter-site standard deviation was higher for GPP and Re, 534 gC m−2 a−1 (37.3%) and 486 gC m−2 a−1 (34.8%), respectively. However, the inter-site standard deviation of NEE was similar to the interannual one, amounting to 207 gC m−2 a−1. Large differences occur due to soil type. The grasslands on organic (peat) soils show a mean net release of CO2 of 220±90 g C m−2 a−1 while the grasslands on mineral (clay and sand) soils show a mean net uptake of CO2 of 90±90 g C m−2 a−1. If a weighing with the fraction of grassland on organic (20%) and mineral soils (80%) is applied, an average NEE of 28 ±90 g C m−2 a−1 is found. The results from the analysis illustrate the need for regionally specific and spatially explicit CO2 emission estimates from grassland. Ammann, C., Flechard, C. R., Leifeld, J., Neftel, A., and Fuhrer, J.: The carbon budget of newly established temperate grassland depends on management intensity, Agric. Ecosyst. Environ., 121, 5–20, 2007. Aubinet, M., Grelle, A., Ibrom, A., Rannik, J., Moncrieff, T., Foken, T., JKowalski, A. S., Martin, P. H., Grunwald, T., Morgenstern, K., Pilegaard, K., Rebmann, C., Snijder, W., Valentini, W., and Vesala, T.: Estimates of the annual net carbon and water exchange of forests: The EUROFLUX methodology, Adv. Ecol. Res., 30, 113–175, 2000. Aubinet, M. Heinesch, B., and Yermaux, M.,:Horizontal and vertical CO2 advection in a sloping forest, Bound.-Layer Meteorol., 108, 397–417, 2003. Baldocchi, D., Falge, E., Gu, L., Olson, R., Hollinger, D., Running, S., Anthoni, P., Bernhofer, C., Davis, K., Evans, R., Fuentes, J., Goldstein, A., Katul, G., Law, B., Lee, X., Malhi, Y., Meyers, T., Munger, W., Oechel, W., Paw, K. T., Pilegaard, K., Schmid, H. P., Valentini, R., Verma, S., Vesala, T., Wilson, K., and Wofsy, S.: FLUXNET: A New Tool to Study the Temporal and Spatial Variability of Ecosystem-Scale Carbon Dioxide, Water Vapor, and Energy Flux Densities, Bull. Am. Meteorol. Soc., 82, 2415–2434, 2001. Beljaars A. C. M. and Bosveld, F. C.: Cabauw data for the validation of land surface parameterization schemes, J. Climate, 10, 1172–1193, 1997. Brandes, L. J., Ruyssenaars, P. G., Vreuls, H. H. J., Coenen, P. W. H. G., Baas, K., van den Berghe, G., van den Born, G. J., Guis, B., Hoen, A., te Molder, R., Nijdam, D. S., Olivier, J. G. J., Peek, C. J., and van Schijndel, M. W.: Greenhouse Gas Emissions in the Netherlands 1990–2005, National Inventory Report 2007, MNP Report 500080006, Netherlands Environmental Assessment Agency (MNP), Bilthoven, Netherlands, 218 pp., 2007. CBS, Central Dutch Statistical Bureau: www.cbs.nl, 2007. EEA: The European environment. State and outlook 2005. European Environment Agency, 576 pp., 2005. Falge, E., Baldocchi, D., Olson, R., Anthoni, P., Aubinet, M., Bernhofer, C., Burba, G., Ceulemans, R., Clement, R., Dolman, H., Granier, A., Gross, P., Grunwald, T., Hollinger, D., Jensen, N. O., Katul, G., Keronen, P., Kowalski, A., Lai, C.T., Law, B. E., Meyers, T., Moncrieff, H., Moors, E., Munger, J. W., Pilegaard, K., Rannik, U., Rebmann, C., Suyker, A., Tenhunen, J., Tu, K., Verma, S., Vesala, T., Wilson, K., and Wofsy, S.: Gap filling strategies for defensible annual sums of net ecosystem exchange, Agric. For. Meteorol., 107, 43–69, 2001. Friedlingstein, P., Cox, P., Betts, R., Bopp, L., von Bloh, W., Brovkin, V., Cadule, P., Doney, S., Eby, M., Fung, I., Bala, G., John, J., Jones, C., Joos, F., Kato, T., Kawamiya, M., Knorr, W., Lindsay, K., Matthews, H. D., Raddatz, T., Rayner, P., Reick, C., Roeckner, E., Schnitzler, K.-G., Schnur, R., Strassmann, K., Weaver, A. J., Yoshikawa, C., and Zeng, N.: Climate-Carbon Cycle Feedback Analysis: Results from the C4MIP Model Intercomparison, J. Climate, 19, 3337–3353, 2006. Gilmanov, T. G., Soussana, J.-F., Allards, A. L., Ammann, C., Balzarolo, M., Barza, Z., Bernhofer, C., Campbell, C. L., Cescatti, A., Clifton-Brown, J., Dirks, B. O. M., Dore, S., Eugster, W., Fuhrer, J., Gimenco, C., Gruenwald, C., Haszpra, L., Hensen, A., Ibrom, A., Jacobs, A. F. G., Jones, M. B., Laurila, G., Lohila, A., Manca, G., Marcolla, B., Nagy, Z., Pilegaard, K., Pinter, K., Pio, C., Raschi, A., Rogiers, N., Sanz, M. J., Stefani, P., Sutton, M., Tuba, Z., Valentini, R., Williams, M. L., and Wohlfahrt, G.: Partitioning European grassland net ecosystem CO2 exchange into gross primary productivity and ecosystem respiration using light response function analysis, Agric. Ecosyst. Environ., 121, 93–120, 2007. Goudriaan, J. and Van Laar, H. H.: Modelling Potential Crop Growth Processes. Kluwer Ac. Publ., Dordrecht, 238 pp., 1994. Hadley, M.: Grasslands for sustainable ecosystems, in: Grasslands for our world, edited by: Baker, M. J., SIR publishing, Wellington, New Zealand, 12–18, 1993. Hartley, I. P., Armstrong, A. F., Murthy, R., Barron-Gafford, G., Ineson, P., and Atkin, O. K.: The dependence of respiration on photosynthetic substrate supply and temperature: integrating leaf, soil and ecosystem measurements, Global Change Biol., 12, 1954–1968, 2006. Hendriks, D. M. D., Van Huissteden, J., Dolman, A. J., and Van der Molen, M. K.: The full greenhouse gas balance of an abandoned peat meadow, Biogeosci., 4, 411–424, 2007. Hu, S., Chapin III, F. S., Firestone, M. K., Field, C. B., and Chiariello, N. R.: Nitrogen limitation of microbial decomposition in a grassland under elevated CO2, Nature, 409, 188–190, 2001. IPCC: Good Practice Guidance for land Use, Land-Use Change and Forestry. IPCC, Cambridge, UK, 2003. Jacobs, A. F. G., Heusinkveld, B. G., and Holtslag, A. A. M.: Carbon dioxide and water vapour flux densities over a grassland area in the Netherlands, Int. J. Climatol., 23, 1663–1675, 2003a. Jacobs, A. F. G., Ronda, R. J., and Holtslag, A. A. M.: Water vapour and carbon dioxide fluxes over bog vegetation, Agric. Forest Meteorol., 116, 103–112, 2003b. Jacobs, A. F. G., Heusinkveld, B. G., and Wichink Kruit, R. J.: Contribution of dew to the water budget of a grassland area in the Netherlands, Water Resour. Res., 42, W03415, doi:10.1029/2005WR004055, 2006. Keuning, J. A.: Grashoogtemeter hulpmiddel voor schatting grashoeveelheid. Meststoffen, 1, 1–3. (in Dutch), 1988. Lafleur, P. M., Moore, T. R., Roulet, N. T., and Frolking, S.: Ecosystem respiration in a cool temperate bog depends on peat temperature but not water table, Ecosyst., 8, 619–629, 2005. Lloyd, J. and Taylor, J. A.: On the temperature dependence of soil respiration, Funct. Ecol., 8, 315–323, 1994. Lloyd, C. R.: Annual carbon balance of a managed wetland meadow in the Somerset Levels, UK, Agric. Forest Meteorol., 138, 168–179, 2006. Nieveen, J. P., Jacobs, C. M. J., and Jacobs, A. F. G.: Diurnal and seasonal variation of carbon dioxide exchange from a former true raised bog, Global Change Biology, 4, 823–833, 1998. Nieveen, J. P., Campbell, D. I., and Schipper, L. A.: Carbon exchange of grazed pasture on a drained peat soil, Global Change Biol., 11, 607–618, 2005. Reichstein, M., Falge, E., Baldocchi, D., Papale, D., Aubinet, M., Berbigier, P., Bernhofer, C., Buchmann, N., Gilmanov, T., Granier, A., Grunwald, T., Havrankova, K., Ilvesniemi, H., Janous, D., Knohl, A., Laurila, T., Lohila, A., Loustau, D., Matteucci, G., Meyers, T., Miglietta, F., Ourcival, J. M., Pumpanen, J., Rambal, S., Rotenberg, E., Sanz, M., J., Seufert, G., Vaccari, F., Vesala, T., Yakir, D., and Valentini, R.: On the separation of net ecosystem exchange into assimilation and ecosystem respiration: review and improved algorithm, Global Change Biol., 11, 1424–1439, 2005. Ruppert, J., Mauder, M., Thomas, C., ane Luers, J.: Innovative gap-filling strategy for annual sums of CO2 net ecosystem exchange, Agric. For. Meteorol., 138, 5–18, 2006. Soussana, J.-F., Allard, V., Pilegaard, K., Ambus, P., Ammann, C., Campbell, C., Ceschia, E., Clifton-Brown, J., Dominques, R., Flechard, C., Fuhrer, J., Hensen, A., Horvath, L., Jones, M., Kasper, G., Martin, C., Nagy, Z., Neftel, A., Raschi, A., Rees, R. M., Skiba, U., Manca, G., Sutton, M., Tuba, Z., and Valentini, R.: A full accounting of the greenhouse gas (CO2, N2O, CH$_4)$ budget of nine European grassland sites, Agric. Ecosyst. Environ., 121, 121–134, 2007a. Soussana, J.-F., Fuhrer, J., Jones, M., and Van Amstel, A.: The greenhouse gas balance of grasslands in Europe, Agric. Ecosyst. Environ., 121, 1–4, 2007b. Van de Wiel, B. J. H, Moene, A. F., Hartogensis, O. K., De Bruin, H. A. R., and Holtslag, A. A. M.: Intermittent turbulence in the stable boundary layer over land. Part III: a classification for annual sums of CO2 net ecosystem exchange, J. Atmos. Sci., 60, 2509–2522, 2003. Van Dijk, A. and Dolman, A. J.: Estimates of CO2 uptake and release among European forests based on eddy covariance data, Global Change Biol., 10, 1445–1459, 2004. Veenendaal, E. M., Kolle, O., Leffelaar, P., Schrier, A., Van Huissteden, K., Van Walsum, J., Moller, F., and Berendse, F.: Land use dependent CO2 exchange and carbon balance in two grassland sites on eutropic drained peat soils. Biogeosci. Discuss., 4, 1633–1671, 2007.