Linking flux network measurements to continental scale simulations: ecosystem carbon dioxide exchange capacity under non-water-stressed conditions

Owen, Katherine E.; Tenhunen, John; Reichstein, Markus; WANG, QUAN; Geyer, Ralf; Xiao, Xiangming; Stoy, Paul C.; Ammann, Christof; Arain, M. Altaf; Aubinet, Marc; Aurela, Mika; Bernhofer, Christian; Chojnicki, Bogdan H.; Granier, André; Gruenwald, T.; Hadley, Julian L.; Heinesch, Bernard; Hollinger, David Y.; Knohl, Alexander; Kutsch, Werner L.; Lohila, Annalea; Meyers, Tilden P.; Moors, E.J.; Moureaux, Christine; Pilegaard, Kim; Saigusa, Nobuko; Verma, Shashi B.; Vesala, Timo; Vogel, Christoph

doi:10.1111/j.1365-2486.2006.01326.x

Cited by 19 publications

(22 citation statements)

References 105 publications

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“…Average annual E (319 mm) was comparable to many other studies in other climates and over different plant functional types. It is comparable to 320 mm [ Kljun et al , 2006] and 321 mm [ Lee et al , 1999] over Boreal mixed forests in Canada, 303 mm [ Kljun et al , 2006] and 320 mm [ Owen et al , 2007] over Boreal evergreen needleleaf forests in Canada and Finland, and 321 mm over a mixed forest in Italy [ Owen et al , 2007]. A few sites reported less annual E than this study site, namely 126 mm over a broadleaf deciduous forest in Finland [ Aurela et al , 2001], 146 mm over a deciduous needleleaf forest in Russia [ Dolman et al , 2004], 180 mm over an open shrubland in Israel [ Grunzweig et al , 2003], 220 mm over a deciduous broadleaf forest in Denmark [ Owen et al , 2007], and 255 mm [ Wever et al , 2002], 225 mm [ Amiro et al , 2006], 237 mm [ Kljun et al , 2006] over a Boreal grassland, a mixed forest, and a evergreen deciduous forest in Canada.…”

Section: Discussionmentioning

confidence: 76%

Interannual variability of evapotranspiration and energy exchange over an annual grassland in California

Ryu¹,

Baldocchi²,

Ma³

et al. 2008

J. Geophys. Res.

189

128

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[1] We report on the interannual variability of evapotranspiration (E) and energy exchange of an annual grassland in the Mediterranean climate zone of California. They were measured directly with the eddy covariance technique over a 6-year period that spanned between July 2001 and June 2007 and experienced a large range in precipitation (376 mm to 888 mm). Despite a two-fold range in precipitation, annual E ranged much less, between 266 mm and 391 mm. We found that pronounced energy-limited and water-limited periods occurred within the same year. In the water-limited period, monthly integrated E scaled negatively with solar radiation and was restrained by precipitation. In the energy-limited period, on the other hand, the majority of E scaled positively with solar radiation (R g ) and was confined by potential E (E p ). E was most sensitive to the availability of soil moisture during the transition to the senescence period rather than onset of the greenness period, causing annual E to be strongly modulated by growing season length. Bulk surface conductance scaled consistently with Priestley-Taylor a coefficient regardless of interannual and seasonal variability of precipitation, E, and solar radiation.

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Section: Discussionmentioning

confidence: 76%

Interannual variability of evapotranspiration and energy exchange over an annual grassland in California

Ryu¹,

Baldocchi²,

Ma³

et al. 2008

J. Geophys. Res.

189

128

View full text Add to dashboard Cite

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“…suggesting that the plateau parameter of gross photosynthesis, Amax, was a good predictor for other light-response parameters, including quantum yield, a, ecosystem respiration rate, rd, and light-use efficiency, ε Owen et al 2007). Baldocchi and Xu (2005) found that Amax was a good predictor for another photosynthetic parameter, the maximum rate of carboxylation (Vc,max).…”

Section: Parameter Interrelationsmentioning

confidence: 99%

Productivity, Respiration, and Light-Response Parameters of World Grassland and Agroecosystems Derived From Flux-Tower Measurements

Gilmanov

Aires²,

Barcza³

et al. 2010

Rangeland Ecology & Management

151

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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

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“…Clearly, for increased confidence in satellite‐derived productivity estimates as well as to offer better diagnostics to large‐scale ecology, it is important to reduce the uncertainties affecting large‐scale LUE patterns and to identify the relevant drivers for its variation. The large number of net CO 2 flux data that are by now becoming available give an unprecedented access to estimates of ecosystem GPP, owing to effort in collecting and processing data in networks like FLUXNET [ Baldocchi et al , 2001; Friend et al , 2007; Owen et al , 2007]. For this study, we derive LUE from CO 2 flux time‐series to estimate LUE GPP over a variety of sites spanning the temperate, boreal and arctic ecosystems.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen controls plant canopy light‐use efficiency in temperate and boreal ecosystems

et al. 2008

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[1] Optimum daily light-use efficiency (LUE) and normalized canopy photosynthesis (GEE*) rate, a proxy for LUE, have been derived from eddy covariance CO 2 flux measurements obtained at a range of sites located in the mid to high latitudes. These two variables were analyzed with respect to environmental conditions, plant functional types (PFT) and leaf nitrogen concentration, in an attempt to characterize their variability and their potential drivers. LUE averaged 0.0182 mol/mol with a coefficient of variation of 37% (42% for GEE*). Foliar nitrogen N of the dominant plant species was found to explain 71% of LUE (n = 26) and 62% of GEE* (n = 44) variance, across all PFTs and sites. Mean Annual Temperature, MAT, explained 27% of LUE variance, and the two factors (MAT and N) combined in a simple linear model explain 80% of LUE and 76% GEE* variance. These results showed that plant canopies in the temperate, boreal and arctic zones fit into a general scheme closely related to the one, which had been established for plant leaves worldwide. The N-MAT-LUE relationships offer perspectives for LUE-based models of terrestrial photosynthesis based on remote sensing. On a continental scale, the decrease of LUE from the temperate to the arctic zone found in the data derived from flux measurements is not in line with LUE resulting from inversion of atmospheric CO 2 .

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Linking flux network measurements to continental scale simulations: ecosystem carbon dioxide exchange capacity under non-water-stressed conditions

Cited by 19 publications

References 105 publications

Interannual variability of evapotranspiration and energy exchange over an annual grassland in California

Interannual variability of evapotranspiration and energy exchange over an annual grassland in California

Productivity, Respiration, and Light-Response Parameters of World Grassland and Agroecosystems Derived From Flux-Tower Measurements

Nitrogen controls plant canopy light‐use efficiency in temperate and boreal ecosystems

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