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[Effect of Elevated CO2 on N2O Emissions from Different Rice Cultivars in Rice Fields]
Hai-Yang Yu1,2, Qiong Huang1,2, Tian-Yu Wang1,2
1State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
Huan Jing Ke Xue= Huanjing Kexue
|July 26, 2021
Summary
Elevated CO2 significantly boosts rice yield and reduces N2O emissions, especially in strongly responsive cultivars. Planting these cultivars offers a dual benefit for agriculture and climate mitigation.
Area of Science:
- Agricultural Science
- Environmental Science
- Climate Change Research
Background:
- Rising atmospheric CO2 levels impact crop physiology and soil greenhouse gas emissions.
- Rice cultivation is a significant source of nitrous oxide (N2O), a potent greenhouse gas.
- Differential responses of rice cultivars to elevated CO2 warrant investigation for climate-smart agriculture.
Purpose of the Study:
- To investigate the effect of elevated CO2 on N2O emissions and yield in strongly and weakly responsive rice cultivars.
- To compare the efficacy of different rice cultivars in mitigating N2O emissions under future climate conditions.
- To identify key soil factors influencing N2O emissions in response to elevated CO2.
Main Methods:
- Utilized a Free Air CO2 Enrichment (FACE) platform for in-situ field experiments.
- Compared four treatment groups: normal/elevated CO2 with weakly/strongly responsive rice cultivars.
- Quantified N2O emissions, grain yield, and N2O emission intensity across treatments.
Main Results:
- Elevated CO2 significantly increased grain yield in strongly responsive cultivars (>30%) and weakly responsive cultivars (10-15%).
- N2O emissions decreased by 52.54% for strongly responsive and 38.40% for weakly responsive cultivars under elevated CO2.
- N2O emission intensity was reduced by 61.68% (strongly responsive) and 45.13% (weakly responsive) cultivars.
Conclusions:
- Strongly responsive rice cultivars are recommended for future planting to maximize yield and minimize N2O emissions under elevated CO2.
- Soil NH4+-N content is a key factor positively correlated with N2O emissions.
- Optimizing rice cultivation with responsive cultivars can contribute to climate change mitigation strategies.
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