Elevated atmospheric CO2 reduces yield-scaled N2 O fluxes from subtropical rice systems Six site-years field experiments

Elevated atmospheric CO2 reduces yield-scaled N2 O fluxes from subtropical rice systems : Six site-years field experiments

© 2020 John Wiley & Sons Ltd.

Bibliographische Detailangaben
Veröffentlicht in:Global change biology. - 1999. - 27(2021), 2 vom: 01. Jan., Seite 327-339
1. Verfasser: Yao, Zhisheng (VerfasserIn)
Weitere Verfasser: Wang, Rui, Zheng, Xunhua, Mei, Baoling, Zhou, Zaixing, Xie, Baohua, Dong, Haibo, Liu, Chunyan, Han, Shenghui, Xu, Zhongjun, Butterbach-Bahl, Klaus, Zhu, Jianguo
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2021
Zugriff auf das übergeordnete Werk:Global change biology
Schlagworte:Journal Article FACE N surplus climate change elevated CO2 greenhouse gas fluxes nitrous oxide rice Greenhouse Gases Soil mehr... Carbon Dioxide 142M471B3J Nitrous Oxide K50XQU1029 Methane OP0UW79H66
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520 |a © 2020 John Wiley & Sons Ltd. 
520 |a Increasing levels of atmospheric CO2 are expected to enhance crop yields and alter soil greenhouse gas fluxes from rice paddies. While elevated CO2 ( E CO 2 ) effects on CH4 emissions from rice paddies have been studied in some detail, little is known how E CO 2 might affect N2 O fluxes or yield-scaled emissions. Here, we report on a multi-site, multi-year in-situ FACE (free-air CO2 enrichment) study, aiming to determine N2 O fluxes and crop yields from Chinese subtropical rice systems as affected by E CO 2 . In this study, we tested various N fertilization and residue addition treatments, with rice being grown under either E CO 2 (+200 μmol/mol) or ambient control. Across the six site-years, rice straw and grain yields under E CO 2 were increased by 9%-40% for treatments fertilized with ≥150 kg N/ha, while seasonal N2 O emissions were decreased by 23%-73%. Consequently, yield-scaled N2 O emissions were significantly lower under E CO 2 . For treatments receiving insufficient fertilization (≤125 kg N/ha), however, no significant E CO 2 effects on N2 O emissions were observed. The mitigating effect of E CO 2 upon N2 O emissions is closely associated with plant N uptake and a reduction of soil N availability. Nevertheless, increases in yield-scaled N2 O emissions with increasing N surplus suggests that N surplus is a useful indicator for assessing N2 O emissions from rice paddies. Our findings indicate that with rising atmospheric CO2 soil N2 O emissions from rice paddies will decrease, given that the farmers' N fertilization is usually sufficient for crop growth. The expected decrease in N2 O emissions was calculated to compensate 24% of the simultaneously observed increase in CH4 emissions under E CO 2 . This shows that for an agronomic and environmental assessment of E CO 2 effects on rice systems, not only CH4 emissions, but also N2 O fluxes and yield-scaled emissions need to be considered for identifying most climate-friendly and economically viable options for future rice production 
650 4 |a Journal Article 
650 4 |a FACE 
650 4 |a N surplus 
650 4 |a climate change 
650 4 |a elevated CO2 
650 4 |a greenhouse gas fluxes 
650 4 |a nitrous oxide 
650 4 |a rice 
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650 7 |a Soil  |2 NLM 
650 7 |a Carbon Dioxide  |2 NLM 
650 7 |a 142M471B3J  |2 NLM 
650 7 |a Nitrous Oxide  |2 NLM 
650 7 |a K50XQU1029  |2 NLM 
650 7 |a Methane  |2 NLM 
650 7 |a OP0UW79H66  |2 NLM 
700 1 |a Wang, Rui  |e verfasserin  |4 aut 
700 1 |a Zheng, Xunhua  |e verfasserin  |4 aut 
700 1 |a Mei, Baoling  |e verfasserin  |4 aut 
700 1 |a Zhou, Zaixing  |e verfasserin  |4 aut 
700 1 |a Xie, Baohua  |e verfasserin  |4 aut 
700 1 |a Dong, Haibo  |e verfasserin  |4 aut 
700 1 |a Liu, Chunyan  |e verfasserin  |4 aut 
700 1 |a Han, Shenghui  |e verfasserin  |4 aut 
700 1 |a Xu, Zhongjun  |e verfasserin  |4 aut 
700 1 |a Butterbach-Bahl, Klaus  |e verfasserin  |4 aut 
700 1 |a Zhu, Jianguo  |e verfasserin  |4 aut 
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773 1 8 |g volume:27  |g year:2021  |g number:2  |g day:01  |g month:01  |g pages:327-339 
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