Climate change: a response surface study of the effects of CO2 and temperature on the growth of beetroot, carrots and onions
Ten daylit, controlled-environment cabinets were used to investigate the possible impacts of global rises in atmospheric CO2 concentration and temperature on beetroot (Beta vulgaris L.), carrot (Daucus carota L.) and bulb onion (Allium cepa L.) plants. Their responses to CO2 concentrations of 350, 4...
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Veröffentlicht in: | Journal of Agricultural Science 1998-09, Vol.131 (2), p.125-133 |
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Zusammenfassung: | Ten daylit, controlled-environment cabinets were used to
investigate the possible impacts of global
rises in atmospheric CO2 concentration and temperature
on beetroot (Beta vulgaris L.), carrot
(Daucus carota L.) and bulb onion (Allium cepa L.)
plants. Their responses to CO2 concentrations of
350, 450, 550, 650 and 750 vpm and temperatures of 12, 13·5,
15, 16·5 and 18°C were examined by
using a fractional factorial design for the two treatment factors.
Use of the daylit cabinets allowed
the plants to be grown in natural light, common atmospheric humidities
(vpd 0·7 kPa) and non-limiting supplies of water and mineral nutrients. Polynomial models were used to summarize the whole plant dry weight
and fresh weight yield
responses and to indicate the potential impact of climate change.
Additionally, the models were used
to generate predictions of the percentage change in whole plant dry
weight and plant fresh weight
yield for the years 2025 and 2050 relative to 1992. Baseline values of
350 vpm for CO2 and a mean
temperature of 13·5°C for 1992 together with forecast
CO2 values of 407 and 442 vpm and
temperature increases of 0·7 and 1·1 C for 2025 and
2050 respectively were used. For 2025, fresh
weight yield changes of +19%, +9% and +13% were obtained for beetroot,
carrot and onion
crops respectively, while for 2050 the respective changes were +32%, +13%
and +21%. Measurements of the ratio of the maximum diameter of the bulb to the
minimum diameter of the
neck for onions showed that there was little or no influence of CO2,
whereas the effect of temperature
was substantial. Bulbing was accelerated by high temperature and was greatly
delayed at low
temperature. At temperatures |
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ISSN: | 0021-8596 1469-5146 |
DOI: | 10.1017/S0021859698005681 |