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How seasonal temperature or water inputs affect the relative response of C3 crops to elevated [CO2]: a global analysis of open top chamber and free air CO2 enrichment studies

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Rising atmospheric carbon dioxide concentration ([CO2]) has the potential to
positively impact C3 food crop production by directly stimulating photosynthetic
carbon gain (A), which leads to increased crop biomass and yield. Further
stimulation of A and yield can result from an indirect mechanism in
which elevated [CO2] decreases stomatal conductance and canopy water use,
ameliorating drought stress. Experiments in open top chambers (OTC) and free
air CO2 enrichment (FACE) facilities have enabled investigation of crop
responses to elevated [CO2] in near natural, field conditions. Mechanistic
understanding of physiological responses to elevated [CO2] has led to predictions
that the stimulation of A, biomass production, and economic yield will
vary with the temperature and water supply experienced by the crop. This study
tested current assumptions about the relationships between relative responses of
yield and biomass to elevated [CO2] and variation in growing season temperature
and water inputs (precipitation plus irrigation). Growing season average
temperature was not a good predictor of the magnitude of biomass and yield
responses to elevated [CO2], contradicting the prediction that responses to elevated
[CO2] would increase with increasing temperature due to the greater benefit
from decreasing photorespiration. However, the prediction that the relative
stimulation of yield by elevated [CO2] would be greatest in dry conditions was
generally supported. Thus, a simple CO2 fertilization value is not appropriate
for modeling future crop productivity under varying environmental conditions.
Further studies are necessary across a broader range of environmental conditions
in order to accurately predict how rising [CO2] will interact with temperature
and drought stress and alter future crop production.

Keywords: Climate change, crop yield, food security.

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Informasi Detail

Judul Seri

Food and Energy Security

No. Panggil

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Penerbit

New York : USDA ARS., 2014

Deskripsi Fisik

Food and Energy Security 2014; 3(1): 33–45

Bahasa

English

ISBN/ISSN

doi: 10.1002/fes3.44

Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

2014; 3(1): 33–45

Subjek

ILMU PANGAN

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

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