Abstract
Recent anthropogenic emissions of key atmospheric trace gases (e.g. CO2 and CH4) which absorb infra-red radiation may lead to an increase in mean surface temperatures and potential changes in climate. Although sources of each gas have been evaluated independently, little attention has focused on potential interactions between gases which could influence emission rates. In the current experiment, the effect of enhanced CO2 (300 μ LL ‐1 above ambient) and/or air temperature (4 °C above ambient) on methane generation and emission were determined for the irrigated tropical paddy rice system over 3 consecutive field seasons (1995 wet and dry seasons 1996 dry season). For all three seasons, elevated CO2 concentration resulted in a significant increase in dissolved soil methane relative to the ambient control. Consistent with the observed increases in soil methane, measurements of methane flux per unit surface area during the 1995 wet and 1996 dry seasons also showed a significant increase at elevated carbon dioxide concentration relative to the ambient CO2 condition (149 and 60% for each season, respectively). Growth of rice at both increasing CO2 concentration and air temperature did not result in additional stimulation of either dissolved or emitted methane compared to growth at elevated CO2 alone. The observed increase in methane emissions were associated with a large, consistent, CO2-induced stimulation of root growth. Results from this experiment suggest that as atmospheric CO2 concentration increases, methane emissions from tropical paddy rice could increase above current projections.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 7
Claim · model-written summary
Elevated CO2 significantly increased dissolved soil methane relative to ambient control in all three seasons.
Verbatim
t0“in tropical paddy rice”
e1“For all three seasons, elevated CO2 concentration resulted in a significant increase in dissolved soil methane relative to the ambient control”
Claim · model-written summary
Elevated CO2 increased methane flux per unit area by 149% in the 1995 wet season.
Verbatim
t0“in tropical paddy rice”
e2“measurements of methane flux per unit surface area during the 1995 wet and 1996 dry seasons also showed a significant increase at elevated carbon dioxide concentration relative to the ambient CO2 condition (149 and 60% for each season, respectively)”
Claim · model-written summary
Elevated CO2 increased methane flux per unit area by 60% in the 1996 dry season.
Verbatim
t0“in tropical paddy rice”
e2“measurements of methane flux per unit surface area during the 1995 wet and 1996 dry seasons also showed a significant increase at elevated carbon dioxide concentration relative to the ambient CO2 condition (149 and 60% for each season, respectively)”
Claim · model-written summary
Elevated CO2 combined with higher air temperature did not further stimulate methane compared with elevated CO2 alone.
- Taxon
- rice
Oryza sativae3 - Treatment
- both increasing CO2 concentration and air temperaturee3
- Outcome
- dissolved or emitted methanee3
- Direction
- did not result in additional stimulatione3
- Comparator
- elevated CO2 alonee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Growth of rice at both increasing CO2 concentration and air temperature did not result in additional stimulation of either dissolved or emitted methane compared to growth at elevated CO2 alone”
Claim · model-written summary
Elevated CO2 stimulated root growth of paddy rice.
Verbatim
t0“in tropical paddy rice”
e4“The observed increase in methane emissions were associated with a large, consistent, CO2-induced stimulation of root growth”
Claim · model-written summary
Methane emissions increased in association with CO2-induced stimulation of root growth.
Verbatim
t0“in tropical paddy rice”
e4“The observed increase in methane emissions were associated with a large, consistent, CO2-induced stimulation of root growth”
Claim · model-written summary
Methane emissions from tropical paddy rice could increase above current projections as atmospheric CO2 rises.
Verbatim
e5“Results from this experiment suggest that as atmospheric CO2 concentration increases, methane emissions from tropical paddy rice could increase above current projections”
The same questions in other papers
co2 · molecular: metabolites · Oryza sativa (rice)Results differ
19 papers in the same direction as this paper · 23 in the opposite direction
- positive
- positive
- positive
39 papers more in this group
See all 43 papers →co2 · environment: emissions · Oryza sativa (rice)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- no effect
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.