Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.15410 |
Elevated atmospheric CO2 reduces yield‐scaled N2O fluxes from subtropical rice systems: Six site‐years field experiments | |
Zhisheng Yao; Rui Wang; Xunhua Zheng; Baoling Mei; Zaixing Zhou; Baohua Xie; Haibo Dong; Chunyan Liu; Shenghui Han; Zhongjun Xu; Klaus Butterbach‐; Bahl; Jianguo Zhu | |
2020-11-15 | |
发表期刊 | Global Change Biology |
出版年 | 2020 |
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 ( ) effects on CH4 emissions from rice paddies have been studied in some detail, little is known how 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 . In this study, we tested various N fertilization and residue addition treatments, with rice being grown under either (+200 μmol/mol) or ambient control. Across the six site‐years, rice straw and grain yields under 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 . For treatments receiving insufficient fertilization (≤125 kg N/ha), however, no significant effects on N2O emissions were observed. The mitigating effect of 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 . This shows that for an agronomic and environmental assessment of 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. |
领域 | 气候变化 ; 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/303915 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Zhisheng Yao,Rui Wang,Xunhua Zheng,等. Elevated atmospheric CO2 reduces yield‐scaled N2O fluxes from subtropical rice systems: Six site‐years field experiments[J]. Global Change Biology,2020. |
APA | Zhisheng Yao.,Rui Wang.,Xunhua Zheng.,Baoling Mei.,Zaixing Zhou.,...&Jianguo Zhu.(2020).Elevated atmospheric CO2 reduces yield‐scaled N2O fluxes from subtropical rice systems: Six site‐years field experiments.Global Change Biology. |
MLA | Zhisheng Yao,et al."Elevated atmospheric CO2 reduces yield‐scaled N2O fluxes from subtropical rice systems: Six site‐years field experiments".Global Change Biology (2020). |
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