TY  - JOUR
  - Gilmanov, Tagir G; Aires, L; Barcza, Z.; Baron, VS; Belelli, L; Beringer, J; Billesbach, D; Bonal, D; Bradford, J; Ceschia, E; Cook, D; Corradi, C; Frank, A; Gianelle, D; Gimeno, C; Gruenwald, T; Guo, Haiqiang; Hanan, N; Haszpra, L; Heilman, J; Jacobs, A; Jones, MB; Johnson, DA; Kiely, G; Li, Shenggong; Magliulo, V; Moors, E; Nagy, Z; Nasyrov, M; Owensby, C; Pinter, K; Pio, C; Reichstein, M; Sanz, MJ; Scott, R; Soussana, J. F; Stoy, PC; Svejcar, T; Tuba, Z; Zhou, Guangsheng
  - 2010
  - Unknown
  - Rangeland Ecology ; Management
  - Productivity, Respiration, and Light-Response Parameters of World Grassland and Agroecosystems Derived From Flux-Tower Measurements
  - Validated
  - ()
  - 63
  - 1
  - 16
  - 39
  - 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 sagebrushsteppe 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. Grunwald, K. Havrankova, 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: 1.424-1439). Maximum values of the quantum yield (alpha=75 mmol.mol(-1)), photosynthetic capacity (A(max)=3.4 mg CO2 . m(-2).s-1), gross photosynthesis (P-g,P-max=1.16 g CO2 . m(-2).d(-1)), and ecological light-use efficiency (epsilon(ecol)=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 (8 600 g CO2 . m(-2).yr(-1)), total ecosystem respiration (7 900 g CO2 . m(-2).yr(-1)), and net CO2 exchange (2 400 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(-1) for intensive grasslands and 933 g CO2 . m(-2).d(-1) for 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.
  - 10.2111/REM-D-09-00072.1
DA  - 2010/NaN
ER  - 

@article{V56528923,
   = {Gilmanov, Tagir G and  Aires, L and  Barcza, Z. and  Baron, VS and  Belelli, L and  Beringer, J and  Billesbach, D and  Bonal, D and  Bradford, J and  Ceschia, E and  Cook, D and  Corradi, C and  Frank, A and  Gianelle, D and  Gimeno, C and  Gruenwald, T and  Guo, Haiqiang and  Hanan, N and  Haszpra, L and  Heilman, J and  Jacobs, A and  Jones, MB and  Johnson, DA and  Kiely, G and  Li, Shenggong and  Magliulo, V and  Moors, E and  Nagy, Z and  Nasyrov, M and  Owensby, C and  Pinter, K and  Pio, C and  Reichstein, M and  Sanz, MJ and  Scott, R and  Soussana, J. F and  Stoy, PC and  Svejcar, T and  Tuba, Z and  Zhou, Guangsheng},
   = {2010},
   = {Unknown},
   = {Rangeland Ecology ; Management},
   = {Productivity, Respiration, and Light-Response Parameters of World Grassland and Agroecosystems Derived From Flux-Tower Measurements},
   = {Validated},
   = {()},
   = {63},
   = {1},
  pages = {16--39},
   = {{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 sagebrushsteppe 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. Grunwald, K. Havrankova, 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: 1.424-1439). Maximum values of the quantum yield (alpha=75 mmol.mol(-1)), photosynthetic capacity (A(max)=3.4 mg CO2 . m(-2).s-1), gross photosynthesis (P-g,P-max=1.16 g CO2 . m(-2).d(-1)), and ecological light-use efficiency (epsilon(ecol)=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 (8 600 g CO2 . m(-2).yr(-1)), total ecosystem respiration (7 900 g CO2 . m(-2).yr(-1)), and net CO2 exchange (2 400 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(-1) for intensive grasslands and 933 g CO2 . m(-2).d(-1) for 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.}},
   = {10.2111/REM-D-09-00072.1},
  source = {IRIS}
}