Partitioning European grassland net ecosystem CO2 exchange into gross primary productivity and ecosystem respiration using light response function analysis

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dc.contributor.author Bernhofer, C.
dc.contributor.author Balzarolo, M.
dc.contributor.author Clifton-Brown, John C.
dc.contributor.author Gilmanov, T. G.
dc.contributor.author Aires, L.
dc.contributor.author Allard, V.
dc.contributor.author Barcza, Z.
dc.contributor.author Campbell, C. L.
dc.contributor.author al, et
dc.contributor.author Soussana, J. F.
dc.contributor.author Ammann, Christof
dc.date.accessioned 2009-07-09T08:58:40Z
dc.date.available 2009-07-09T08:58:40Z
dc.date.issued 2009-07-09
dc.identifier.citation Bernhofer , C , Balzarolo , M , Clifton-Brown , J C , Gilmanov , T G , Aires , L , Allard , V , Barcza , Z , Campbell , C L , al , Soussana , J F & Ammann , C 2009 , ' Partitioning European grassland net ecosystem CO2 exchange into gross primary productivity and ecosystem respiration using light response function analysis ' Agriculture , pp. 1-2 . en
dc.identifier.other PURE: 117982
dc.identifier.other dspace: 2160/2592
dc.identifier.uri http://hdl.handle.net/2160/2592
dc.description Gilmanov, T. G., Soussana, J. F., Aires, L., Allard, V., Ammann, C., Balzarolo, M., Barcza, Z., Bernhofer, C., Campbell, C. L., Cernusca, A., Cescatti, A., Clifton-Brown, J. C., Dirks, B. O. M., Dore, S., Eugster, W., Fuhrer, J., Gimeno, C., Gruenwald, T., Haszpra, L., Hensen, A., Ibrom, A., Jacobs, A. F. G., Jones, M. B., Lanigan, G., Laurila, T., Lohila, A., Manca, G., Marcolla, B., Nagy, Z., Pilegaard, K., Pinter, K., Pio, C., Raschi, A., Rogiers, N., Sans, M. J., Stefani, P., Sutton, M. A., Tuba, Z., Valentini, R., Williams, M. L., Wohlfahrt, G. (2007). Partitioning European grassland net ecosystem CO2 exchange into gross primary productivity and ecosystem respiration using light response function analysis. Agriculture, Ecosystems and Environment, 121, (1-2), 93-120 The Greenhouse Gas Balance of Grasslands in Europe, Edited by Jean-François Soussana, Jürg Fuhrer, Mike Jones and Andre Van Amstel en
dc.description.abstract Tower CO2 flux measurements from 20 European grasslands in the EUROGRASSFLUX data set covering a wide range of environmental and management conditions were analyzed with respect to their ecophysiological characteristics and CO2 exchange (gross primary production, Pg, and ecosystem respiration, Re) using light-response function analysis. Photosynthetically active radiation (Q) and top-soil temperature (Ts) were identified as key factors controlling CO2 exchange between grasslands and the atmosphere at the 30-min scale. A nonrectangular hyperbolic light-response model P(Q) and modified nonrectangular hyperbolic light¿temperature-response model P(Q, Ts) proved to be flexible tools for modeling CO2 exchange in the light. At night, it was not possible to establish robust instantaneous relationships between CO2 evolution rate rn and environmental drivers, though under certain conditions, a significant relationship rn=r0 ekTTs was found using observation windows 7¿14 days wide. Principal light-response parameters¿apparent quantum yield, saturated gross photosynthesis, daytime ecosystem respiration, and gross ecological light-use efficiency, = Pg/Q, display patterns of seasonal dynamics which can be formalized and used for modeling. Maximums of these parameters were found in intensively managed grasslands of Atlantic climate. Extensively used semi-natural grasslands of southern and central Europe have much lower production, respiration, and light-use efficiency, while temperate and mountain grasslands of central Europe ranged between these two extremes. Parameters from light¿temperature-response analysis of tower data are in agreement with values obtained using closed chambers and free-air CO2 enrichment. Correlations between light-response and productivity parameters provides the possibility to use the easier to measure parameters to estimate the parameters that are more difficult to measure. Gross primary production (Pg) of European grasslands ranges from 1700 g CO2 m¿2 year¿1 in dry semi-natural pastures to 6900 g CO2 m¿2 year¿1 in intensively managed Atlantic grasslands. Ecosystem respiration (Re) is in the range 1800 <Re <6000 g CO2 m¿2 year¿1. Annual net ecosystem CO2 exchange (NEE) varies from significant net uptake (>2400 g CO2 m¿2 year¿1) to significant release ( en
dc.format.extent 2 en
dc.language.iso eng
dc.relation.ispartof Agriculture en
dc.title Partitioning European grassland net ecosystem CO2 exchange into gross primary productivity and ecosystem respiration using light response function analysis en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.contributor.institution Institute of Biological, Environmental and Rural Sciences en
dc.description.status Peer reviewed en


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