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Elevated atmospheric CO2 reduces yield-scaled N2O fluxes from subtropical rice systems: Six site-years field experiments

文献类型：期刊论文

作者Yao, Zhisheng3; Wang, Rui3; Zheng, Xunhua3,5; Mei, Baoling3,9; Zhou, Zaixing3,8; Xie, Baohua3,7; Dong, Haibo3,6; Liu, Chunyan3; Han, Shenghui3; Xu, Zhongjun2,3
刊名GLOBAL CHANGE BIOLOGY
出版日期2020-11-15
页码13
关键词climate change elevated CO2 FACE greenhouse gas fluxes N surplus nitrous oxide rice
ISSN号1354-1013
DOI10.1111/gcb.15410
通讯作者Yao, Zhisheng(zhishengyao@mail.iap.ac.cn) ; Wang, Rui(wangrui@mail.iap.ac.cn)
英文摘要Increasing levels of atmospheric CO2 are expected to enhance crop yields and alter soil greenhouse gas fluxes from rice paddies. While elevated CO2 ( ECO2) effects on CH4 emissions from rice paddies have been studied in some detail, little is known how ECO2 might affect N2O 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 N2O fluxes and crop yields from Chinese subtropical rice systems as affected by ECO2. In this study, we tested various N fertilization and residue addition treatments, with rice being grown under either ECO2 (+200 mu mol/mol) or ambient control. Across the six site-years, rice straw and grain yields under ECO2 were increased by 9%-40% for treatments fertilized with >= 150 kg N/ha, while seasonal N2O emissions were decreased by 23%-73%. Consequently, yield-scaled N2O emissions were significantly lower under ECO2. For treatments receiving insufficient fertilization (<= 125 kg N/ha), however, no significant ECO2 effects on N2O emissions were observed. The mitigating effect of ECO2 upon N2O emissions is closely associated with plant N uptake and a reduction of soil N availability. Nevertheless, increases in yield-scaled N2O emissions with increasing N surplus suggest that N surplus is a useful indicator for assessing N2O emissions from rice paddies. Our findings indicate that with rising atmospheric CO2 soil N2O emissions from rice paddies will decrease, given that the farmers' N fertilization is usually sufficient for crop growth. The expected decrease in N2O emissions was calculated to compensate 24% of the simultaneously observed increase in CH4 emissions under ECO2. This shows that for an agronomic and environmental assessment of ECO2 effects on rice systems, not only CH4 emissions, but also N2O fluxes and yield-scaled emissions need to be considered for identifying most climate-friendly and economically viable options for future rice production.
WOS关键词NITROUS-OXIDE EMISSIONS ; CARBON-DIOXIDE CONCENTRATION ; ENRICHMENT FACE ; SEASONAL-CHANGES ; PADDY FIELDS ; SOIL-C ; BIOMASS PRODUCTION ; SHORTGRASS STEPPE ; GROWING-SEASON ; GRASS SWARDS
资助项目Chinese Academy of Sciences[ZDBS-LY-DQCOO7] ; National Natural Science Foundation of China[41977282] ; National Natural Science Foundation of China[41675144]
WOS研究方向Biodiversity & Conservation ; Environmental Sciences & Ecology
语种英语
WOS记录号WOS:000589173900001
资助机构Chinese Academy of Sciences ; National Natural Science Foundation of China
源URL[http://ir.yic.ac.cn/handle/133337/28329]  
专题烟台海岸带研究所_近岸生态与环境实验室
烟台海岸带研究所_中科院海岸带环境过程与生态修复重点实验室
通讯作者Yao, Zhisheng; Wang, Rui
作者单位1.Karlsruhe Inst Technol, Inst Meteorol & Climate Res, Atmospher Environm Res, Garmisch Partenkirchen, Germany
2.Beijing Univ Chem Technol, Dept Environm Sci & Engn, Beijing, Peoples R China
3.Chinese Acad Sci, State Key Lab Atmospher Boundary Layer Phys & Atm, Inst Atmospher Phys, Beijing 100029, Peoples R China
4.Chinese Acad Sci, State Key Lab Soil & Sustainable Agr, Nanjing Inst Soil Sci, Nanjing, Peoples R China
5.Univ Chinese Acad Sci, Coll Earth Sci, Beijing, Peoples R China
6.Guangdong Acad Sci, Guangdong Key Lab Integrated Agroenvironm Pollut, Guangdong Inst Ecoenvironm Sci & Technol, Guangzhou, Peoples R China
7.Chinese Acad Sci, Key Lab Coastal Zone Environm Proc & Ecol Remedia, Yantai Inst Coastal Zone Res, Yantai, Peoples R China
8.Univ New Hampshire, Inst Study Earth Oceans & Space, Earth Syst Res Ctr, Durham, NH 03824 USA
9.Inner Mongolia Univ, Sch Ecol & Environm, Hohhot, Peoples R China
推荐引用方式
GB/T 7714		 Yao, Zhisheng,Wang, Rui,Zheng, Xunhua,et al. Elevated atmospheric CO2 reduces yield-scaled N2O fluxes from subtropical rice systems: Six site-years field experiments[J]. GLOBAL CHANGE BIOLOGY,2020:13.
APA Yao, Zhisheng.,Wang, Rui.,Zheng, Xunhua.,Mei, Baoling.,Zhou, Zaixing.,...&Zhu, Jianguo.(2020).Elevated atmospheric CO2 reduces yield-scaled N2O fluxes from subtropical rice systems: Six site-years field experiments.GLOBAL CHANGE BIOLOGY,13.
MLA Yao, Zhisheng,et al."Elevated atmospheric CO2 reduces yield-scaled N2O fluxes from subtropical rice systems: Six site-years field experiments".GLOBAL CHANGE BIOLOGY (2020):13.

入库方式： OAI收割

来源：烟台海岸带研究所

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