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Title:   Author  item
                                            GILMANOV, T. - South Dakota State Universityitem
                                            AIRES, L - Bielefeld Universityitem
                                            BARCZA, Z. - Eotvos Lorand Universityitem
                                            BARON, V.S. - Agriculture And Agri-Food Canadaitem
                                            BELELLI, L. - University Of Tusciaitem
                                            BERINGER, J. - Monash Universityitem
                                            BILLESBACH, D. - University Of Nebraskaitem
                                            BONAL, D. - Ecolab Resesearch Centeritem
                                            BRADFORD, J. - Us Forest Service (FS)item
                                            CESCHIA, E. - Center For The Study Of The Biosphère From Space(CESBIO)item
                                            COOK, D. - Oak Ridge National Laboratoryitem
                                            CORRADI, C. - Universita Di Padovaitem
                                            Frank, Amiitem
                                            GIANELLE, D. - Campus Montecilloitem
                                            GIMENO, C. - Fundacion Chileitem
                                            GRUNWALD, T. - Dresden Universityitem
                                            GUO, H. - Tallinn University Of Technologyitem
                                            HANAN, N. - Colorado State Universityitem
                                            HASZPRA, L. - Hungarian Academy Of Sciencesitem
                                            HEILMAN, J. - West Texas A & M Universityitem
                                            JACOBS, A. - University Of Wageningenitem
                                            JONES, M.B. - University Of Londonitem
                                            JOHNSON, D.A. - Utah State Universityitem
                                            KIELY, G. - National University Of Irelanditem
                                            LI, S. - University Of Beijingitem
                                            MAGLIULO, V. - National Center For Agricultural Research (CNRA)item
                                            MOORS, E. - Alterra-Ilri, Netherlandsitem
                                            NAGY, Z. - Brookhaven National Laboratoryitem
                                            NASYROV, M. - University Of Budapestitem
                                            OWENSBY, C. - Kansas State Universityitem
                                            PINTER, K. - Hungarian Academy Of Sciencesitem
                                            PIO, C. - Universidade Catolica Portuguesaitem
                                            REICHSTEIN, M. - Max Planck Societyitem
                                            SANZ, M.J. - Fundacion Chileitem
                                            Scott, Russell

                                                         - *Russ*item
                                            SOUSSANA, J.F. - Institut National De La Recherche Agronomique (INRA)item
                                            STOY, P. - University Of Edinburghitem
                                            Svejcar, Anthonyitem
                                            TUBA, Z. - Flux Expertsitem
                                            ZHOU, G. - University Of Oklahoma
  Submitted to: Rangeland Ecology and Management
                                    Publication Type: Peer Reviewed Journal
                                    Publication Acceptance Date: 7/13/2009
                                    Publication  Date: 1/20/2010
                                    Citation: Gilmanov, T.G., Aires, L.M., Barcza, Z., Baron, V., Belelli, L., Beringer, J., Billesbach, D., Bonal, D., Bradford, J., Ceschia, E., Cook, D., Corradi, C., Frank, A.T., Gianelle, D., Gimeno, C., Grunwald, T., Guo, H., Hanan, N., Haszpra, L., Heilman, J., Jacobs, A., Jones, M., Johnson, D., Kiely, G., Li, S., Magliulo, V., Moors, E., Nagy, Z., Nasyrov, M., Owensby, C., Pinter, K., Pio, C., Reichstein, M., Sanz, M., Scott, R.L., Soussana, J., Stoy, P.C., Svejcar, A.J., Tuba, Z., Zhou, G. 2010. Productivity, respiration, and light-response parameters of world grassland and agroecosystems derived from flux-tower measurements. Rangeland Ecology and Management. 63:16-39. https://doi.org/10.2111/REM-D-09-00072.1.DOI: https://doi.org/10.2111/REM-D-09-00072.1                                                              
                                Interpretive Summary: 
Grasslands and cultivated lands occupy one-third of the earth’s land surface area, but their contribution to the global carbon cycle remains uncertain. We used a large dataset of carbon dioxide exchange measurements to quantify plant productivity, respiration, and growth parameters of grasslands, shrublands/savanna, wetlands, and cropland ecosystems worldwide.  We found that the growth of these types of ecosystems exceeded those of most forest ecosystems, indicating the potential of non-forest ecosystems for uptake of atmospheric carbon dioxide. Maximum values of plant productivity, respiration, and net carbon dioxide exchange were observed for intensively managed grasslands and high-yield crops, and were comparable to or higher than those for forest ecosystems, excluding some tropical forests. On average, 80% of these sites were apparent sinks for atmospheric carbon dioxide. However, part of these apparent sinks is accumulated in crops and forage, which are carbon pools that are harvested, transported, and decomposed off site. 


.
                                Technical Abstract: Grasslands and agroecosystems occupy one-third of the terrestrial area, but their contribution to the global carbon cycle remains uncertain. We used a set of 316 site-years of CO2 exchange measurements to quantify gross primary productivity, respiration, and light-response parameters of grasslands, shrublands/savanna, wetlands, and cropland ecosystems worldwide. We analyzed data from 72 global flux-tower sites partitioned into gross photosynthesis and ecosystem respiration with the use of the light response
method (Gilmanov, T. G., D. A. Johnson, and N. Z. Saliendra. 2003. Growing season CO2 fluxes in a sagebrush-steppe ecosystem in Idaho: Bowen ratio/energy balance measurements and modeling. Basic and Applied Ecology 4:167–183) from the RANGEFLUX and WORLDGRASSAGRIFLUX data sets supplemented by 46 sites from the FLUXNET La Thuile data set partitioned with the use of the temperature-response method (Reichstein, M., E. Falge, D. Baldocchi, D. Papale, R. Valentini, M. Aubinet, P. Berbigier, C. Bernhofer, N. Buchmann, M. Falk, T. Gilmanov, A. Granier, T. Gru ̈ nwald, K. Havra ́nkova ́, D. Janous, A. Knohl, T. Laurela, A. Lohila, D. Loustau, G. Matteucci, T. Meyers, F. Miglietta, J. M. Ourcival, D. Perrin, J. Pumpanen, S. Rambal, E. Rotenberg, M. Sanz, J. Tenhunen, G. Seufert, F. Vaccari, T. Vesala, and D. Yakir. 2005. On the separation of net ecosystem exchange into assimilation and ecosystem respiration: review and improved algorithm. Global Change Biology 11:1424–1439). Maximum values of the quantum yield (a = 75 mmol mol-1), photosynthetic capacity (Amax= 3.4 mg CO2 m-2 s-1), gross photosynthesis (Pg,max=116 g CO2 m-2 d-1), and ecological light-use efficiency (eecol=59 mmol mol-1) of managed grasslands and high-production croplands exceeded those of most forest ecosystems, indicating the potential of nonforest ecosystems for uptake of atmospheric CO2. Maximum values of gross primary production (8600 g CO2 m-2 yr-1), total ecosystem respiration (7900 g CO2 m-2 yr-1), and net CO2 exchange (2400 g CO2 m-2 yr-1) were observed for intensively managed grasslands and high-yield crops, and are comparable to or higher than those for forest ecosystems, excluding some tropical forests. On average, 80% of the nonforest sites were apparent sinks for atmospheric CO2, with mean net uptake of 700 g CO2 m-2 yr-1for intensive grasslands and 933 g CO2 m-2 yr-1for croplands. However, part of these apparent sinks is accumulated in crops and forage, which are carbon pools that are harvested, transported, and decomposed off site. Therefore, although agricultural fields may be predominantly sinks for atmospheric CO2, this does not imply that they are necessarily increasing their carbon stock.


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