Interactions of CO2, temperature and management practices: Simulations with a modified version of CERES-Wheat

Francesco N. Tubiello, Cynthia Rosenzweig, Tyler Volk

Research output: Contribution to journalArticle

Abstract

A new growth subroutine was developed for CERES-Wheat, a computer model of wheat (Triticum aestivum) growth and development. The new subroutine simulates canopy photosynthetic response to CO2 concentrations and light levels, and includes the effects of temperature on canopy light-use efficiency. Its performance was compared to the original CERES-Wheat V-2·10 in 30 different cases. Biomass and yield predictions of the two models were well correlated (correlation coefficient r > 0·95). As an application, summer growth of spring wheat was simulated at one site. Modeled crop responses to higher mean temperatures, different amounts of minimum and maximum warming, and doubled CO2 concentrations were compared to observations. The importance of irrigation and nitrogen fertilization in modulating the wheat crop climatic responses were also analyzed. Specifically, in agreement with observations, rainfed crops were found to be more sensitive to CO2 increases than irrigated ones. On the other hand, low nitrogen applications depressed the ability of the wheat crop to respond positively to CO2 increases. In general, the positive effects of high CO2 on grain yield were found to be almost completely counterbalanced by the negative effects of high temperatures. Depending on how temperature minima and maxima were increased, yield changes averaged across management practices ranged from -4% to 8%.

Original languageEnglish (US)
Pages (from-to)135-152
Number of pages18
JournalAgricultural Systems
Volume49
Issue number2
DOIs
StatePublished - 1995

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wheat
crops
temperature
canopy
nitrogen
spring wheat
computer simulation
growth and development
Triticum aestivum
grain yield
irrigation
prediction
summer
biomass

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Animal Science and Zoology

Cite this

Interactions of CO2, temperature and management practices : Simulations with a modified version of CERES-Wheat. / Tubiello, Francesco N.; Rosenzweig, Cynthia; Volk, Tyler.

In: Agricultural Systems, Vol. 49, No. 2, 1995, p. 135-152.

Research output: Contribution to journalArticle

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