Growing wheat in Biosphere 2 under elevated CO2: Observations and modeling

Francesco N. Tubiello, Tilak Mahato, Ty Morton, John W. Druitt, Tyler Volk, Bruno D V Marino

Research output: Contribution to journalArticle

Abstract

Spring wheat (Triticum aestivum L., cv. Yecora Rojo) was grown in the intensive agricultural biome (IAB) of Biosphere 2 during the 1995-1996 winter/spring season. Environmental conditions were characterized by a day/night temperature regime of 27/17°C, relative humidity (RH) levels around 45%, mean atmospheric CO2 concentration of 450 ppmv, and natural light conditions with mean intensities about half of outside levels. Weekly samples of above-ground plant matter were collected throughout the growing season and phenological events recorded. A computer model, CERES-Wheat, previously tested under both field and controlled conditions, was used to simulate the observed crop growth and to help in data analysis. We found that CERES-Wheat simulated the data collected at Biosphere 2 to within 10% of observed, thus suggesting that wheat growth inside the IAB was comparable to that documented in other environments. The model predicts phenological stages and final dry matter (DM) production within 10% of the observed data. Measured DM production rates, normalized for light absorbed by the crop, suggested photosynthetic efficiencies intermediate between those observed under optimal field conditions and those recorded in NASA-Controlled Ecological Life-Support Systems (CELSS). We suggest that such a difference can be explained primarily in terms of low light levels inside the IAB, with additional effects due to elevated CO2 concentrations and diffuse light fractions.

Original languageEnglish (US)
Pages (from-to)273-286
Number of pages14
JournalEcological Engineering
Volume13
Issue number1-4
DOIs
StatePublished - Jun 1999

Fingerprint

Biosphere 2
biome
wheat
dry matter accumulation
ecosystems
modeling
Crops
dry matter
support systems
night temperature
crops
spring wheat
computer simulation
crop
spring (season)
data analysis
relative humidity
solar radiation
Triticum aestivum
growing season

Keywords

  • Biosphere 2
  • Controlled environments
  • Crop models
  • Elevated CO
  • Wheat

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Environmental Engineering

Cite this

Tubiello, F. N., Mahato, T., Morton, T., Druitt, J. W., Volk, T., & Marino, B. D. V. (1999). Growing wheat in Biosphere 2 under elevated CO2: Observations and modeling. Ecological Engineering, 13(1-4), 273-286. https://doi.org/10.1016/S0925-8574(98)00104-9

Growing wheat in Biosphere 2 under elevated CO2 : Observations and modeling. / Tubiello, Francesco N.; Mahato, Tilak; Morton, Ty; Druitt, John W.; Volk, Tyler; Marino, Bruno D V.

In: Ecological Engineering, Vol. 13, No. 1-4, 06.1999, p. 273-286.

Research output: Contribution to journalArticle

Tubiello, FN, Mahato, T, Morton, T, Druitt, JW, Volk, T & Marino, BDV 1999, 'Growing wheat in Biosphere 2 under elevated CO2: Observations and modeling', Ecological Engineering, vol. 13, no. 1-4, pp. 273-286. https://doi.org/10.1016/S0925-8574(98)00104-9
Tubiello, Francesco N. ; Mahato, Tilak ; Morton, Ty ; Druitt, John W. ; Volk, Tyler ; Marino, Bruno D V. / Growing wheat in Biosphere 2 under elevated CO2 : Observations and modeling. In: Ecological Engineering. 1999 ; Vol. 13, No. 1-4. pp. 273-286.
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