Modelling Net Photosynthetic Rate of Temperate Dry Grassland Species and Winter Wheat at Elevated Air Co2 Concentration

Harnos, N.; Nagy, Zoltán; Balogh, János; Tuba, Zoltán

doi:10.15666/aeer/0402_047053

Cited by 7 publications

(5 citation statements)

References 10 publications

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“…Photosynthetic activity of Katy was significantly increased in greenhouse, particularly when the CO 2 concentration was above 400 μmol mol -1 . The results corroborate the conclusions of earlier investigations (Szente et al 1998, Harnos et al 2002. The two cultivars differed greatly in response to irradiance (Table 2).…”

Section: Discussionsupporting

confidence: 92%

Photosynthetic responses of apricot (Prunus armeniaca L.) to photosynthetic photon flux density, leaf temperature, and CO<sub>2</sub> concentration

Wang¹,

Wang²,

Wang³

2007

Photosynt.

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Two cultivars (Katy and Erhuacao) of apricot (Prunus armeniaca L.) were evaluated under open-field and solar-heated greenhouse conditions in northwest China, to determine the effect of photosynthetic photon flux density (PPFD), leaf temperature, and CO 2 concentration on the net photosynthetic rate (P N ). In greenhouse, Katy registered 28.3 μmol m -2 s -1 for compensation irradiance and 823 μmol m -2 s -1 for saturation irradiance, which were 73 and 117 % of those required by Erhuacao, respectively. The optimum temperatures for cvs. Katy and Erhuacao were 25 and 35 ºC in open-field and 22 and 30 ºC in greenhouse, respectively. At optimal temperatures, P N of the field-grown Katy was 16.5 μmol m -2 s -1 , 21 % less than for a greenhouse-grown apricot. Both cultivars responded positively to CO 2 concentrations below the CO 2 saturation concentration, whereas Katy exhibited greater P N (18 %) and higher carboxylation efficiency (91 %) than Erhuacao at optimal CO 2 concentration. Both cultivars exhibited greater photosynthesis in solar-heated greenhouses than in open-field, but Katy performed better than Erhuacao under greenhouse conditions.

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Section: Discussionsupporting

confidence: 92%

Photosynthetic responses of apricot (Prunus armeniaca L.) to photosynthetic photon flux density, leaf temperature, and CO<sub>2</sub> concentration

Wang¹,

Wang²,

Wang³

2007

Photosynt.

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“…Earlier results suggested that the Farquhar model was suitable for the description of the net photosynthesis of winter wheat under various environmental conditions (radiation, temperature, atmospheric CO 2 concentration) and could thus be usefully incorporated into wheat growth simulation models [7]. In the course of the present work the Farquhar model was thus incorporated into the module of the AFRCWHEAT2 model that describes net CO 2 assimilation, thus developing the AF2MOD model.…”

Section: Discussionmentioning

confidence: 91%

Applicability of the Af Rcwheat2 Wheat Growth Simulation Model in Hungary

Harnos¹

2006

Appl Ecol Env Res

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Harnos: Applicability of the AFRCWHEAT2 wheat growth simulation model in Abstract. The aim of the present work was to determine the applicability of the AFRCWHEAT2 wheat growth model under Hungarian conditions. The Farquhar model, which, when properly calibrated, gives a satisfactory description of the net photosynthesis of Hungarian winter wheat varieties at various atmospheric CO 2 concentrations, temperatures and light conditions, was incorporated into the model. Both the original AFRCWHEAT2 model and the modified AF2MOD model were tested on long-term yield and climatic data series from Győr-Moson-Sopron County. It was observed that the average yield over the period 1980-1990 was well simulated by both models, but the AF2MOD simulated the annual fluctuations much better: the determination coefficients describing the correlation between the actual wheat yield in Győr-Moson-Sopron county over the whole period and the values generated using the models were r² = 0.32 for the AFRCWHEAT2 model and r² = 0.86 for AF2MOD.A comparison of the results simulated using the AFRCWHEAT2 and AF2MOD models demonstrated that detailed physiological submodels are required for the mathematical description of plant growth if yields are to be accurately estimated and the effects of environmental changes adequately described. A good example of this is the description of the effect of atmospheric CO 2 concentration on simulated yield figures, which depended on the climate of the given year in the AF2MOD model, but was described by a simple linear function in the AFRCWHEAT2 model.

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“…The accuracy of biomass predictions demonstrated that the model could complement field studies and serve as a valuable tool in evaluating management of these grasses and their impact on forage productivity of a site, soil erosion, water use, nutrient cycling, and wildlife habitat. Future applications of more detailed CO 2 photosynthetic simulation models [37][38][39][40] in this context will be interesting, in light of the differences between simulated and measured values in this study.…”

Section: Discussionmentioning

confidence: 97%

Novel Application of ALMANAC: Modelling a Functional Group, Exotic Warm-season Perennial Grasses

Kiniry

2013

AJEA

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Aim: To determine the efficacy of the ALMANAC model in simulating leaf canopy growth and biomass production of a plant functional group, specifically "exotic warm-season perennial grasses," represented by buffelgrass [Pennisetum ciliare (L.) Link] and "Old World Bluestems" (Bothriochloa Kuntze, Capillipedium Stapf, and Dichanthium Willemet). Study Design: Leaf area index (LAI) over the growing season, the light extinction coefficient (k) for Beer's Law, and the radiation use efficiency (RUE) were quantified for Old World Bluestems and buffelgrass.

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Modelling Net Photosynthetic Rate of Temperate Dry Grassland Species and Winter Wheat at Elevated Air Co2 Concentration

Cited by 7 publications

References 10 publications

Photosynthetic responses of apricot (Prunus armeniaca L.) to photosynthetic photon flux density, leaf temperature, and CO<sub>2</sub> concentration

Photosynthetic responses of apricot (Prunus armeniaca L.) to photosynthetic photon flux density, leaf temperature, and CO<sub>2</sub> concentration

Applicability of the Af Rcwheat2 Wheat Growth Simulation Model in Hungary

Novel Application of ALMANAC: Modelling a Functional Group, Exotic Warm-season Perennial Grasses

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