Methane and nitrous oxide emission characteristics of high-yielding rice field
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RESEARCH ARTICLE
Methane and nitrous oxide emission characteristics of high-yielding rice field Zi-Hao Wang 1 & Liu-Hang Wang 2 & He Liang 1 & Ting Peng 1 & Gui-Ping Xia 3 & Jing Zhang 1 & Quan-Zhi Zhao 1 Received: 17 August 2020 / Accepted: 11 November 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract As representative varieties of the four phases of the super rice breeding project in China, Lianyoupei 9 (LYP9), Y Liangyou 1 (YLY1), Y Liangyou 2 (YLY2), and Y Liangyou 900 (YLY900) achieved higher yield under optimal cultivation techniques. However, the impact of these high-yield rice varieties on greenhouse gas (GHG) emissions under high-yield cultivation management practices remains poorly understood. In this study, we conducted field experiments to investigate CH4 and N2O emissions from paddies containing four elite rice varieties, managed with field drying at the ineffective tillering stage and alternate wet/dry irrigation at the grain-filling stage. The plants were fertilised with nitrogen (N) at three different rates. The results showed that CH4 emission was highest at the tillering stage. N2O emission flux was dramatically increased by field drying at the ineffective tillering stage, and with the rate of N application. Rice variety was among the most important factors affecting CH4 emission and global warming potential (GWP). N2O emission was mainly related to N application rate rather than rice variety. YLY2 achieved higher yield than LYP9, YLY1, and YLY900, and lower GHG emission than YLY900. Our results indicate that rice variety should be considered as a key factor to reduce GHG emissions from rice paddies under high-yield cultivation practices. Based on its high yield and low GHG emission at the study site, YLY2 may be an optimal rice variety. Keywords Global warming potential . Greenhouse gas intensity . Methane . Nitrogen . Nitrous oxide . Super hybrid rice
Introduction Rice is the staple food of more than half of the global population. In the 1980s, China’s Ministry of Agriculture launched a super rice breeding project to support the increasing population of China, based on the development of high-yield potential varieties and cultivation techniques. The representative
Zi-Hao Wang and Liu-Hang Wang contributed equally to this work. Responsible Editor: Philippe Garrigues * Jing Zhang [email protected] * Quan-Zhi Zhao [email protected] 1
College of Agronomy, Henan Agricultural University, Zhengzhou 450046, People’s Republic of China
2
College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, People’s Republic of China
3
Anhui Shennong Agricultural Technology Development Limited Company, Hefei 230031, People’s Republic of China
elite varieties of the four phases of the super rice breeding project are Lianyoupei 9 (LYP9), Y Liangyou 1 (YLY1), Y Liangyou 2 (YLY2), and Y Liangyou 900 (YLY900). The morphological and physiological traits of the shoots and roots of these varieties have been documented (Liu et al. 2018). The impacts of incr
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