Pedosphere 27(1): 52--64, 2017
ISSN 1002-0160/CN 32-1315/P
©2017 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Variations of stable carbon isotopes of CH4 emission from three typical rice fields in China
ZHANG Guang-Bin1, MA Jing1, YANG Yu-Ting1,2, YU Hai-Yang1,2, SHI Ya-Ping1,2 and XU Hua1
1State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China)
2University of Chinese Academy of Sciences, Beijing 100049 (China)
ABSTRACT
      Little is known about the stable carbon isotopes of methane (CH4) emitted (δ13CH4emitted) from permanently flooded rice fields and double rice-cropping fields. The CH4 emission and corresponding δ13CH4emitted under various field managements (mulching, water regime, tillage, and nitrogen (N) fertilization) were simultaneously measured in three typical Chinese rice fields, a permanently flooded rice field in Ziyang City, Sichuan Province, Southwest China, a double-rice cropping field, in Yingtan City, Jiangxi Province, Southeast China, and a rice-wheat rotation field in Jurong City, Jiangsu Province, East China, from 2010 to 2012. Results showed different seasonal variations of δ13CH4emitted among the three fields during the rice-growing season. The values of δ13CH4emitted were negatively correlated with corresponding CH4 emissions in seasonal variation and mean, indicating the importance of CH4 production, oxidation, and transport associated with isotopic fractionation effects to the δ13CH4emitted. Seasonal variations of δ13CH4emitted were slightly impacted by mulching cultivation, tillage, and N application, but highly controlled by drainage. Meanwhile, tillage, N application, and especially mulching cultivation had important effects on seasonal mean CH4 emissions and corresponding δ13CH4emitted, with low emissions accompanied by high values of δ13CH4emitted. Seasonal mean values of δ13CH4emitted from the three fields were similar, mostly ranging from --60‰ to --50‰, which are well in agreement with previously published data. These demonstrated that seasonal variations of δ13CH4emitted mainly depended on the changes in CH4 emission from rice fields and further indicated the important effects of methanogenic pathways, CH4 oxidation, and CH4 transport associated with isotope fractionation effects influenced by field managements on δ13CH4emitted.
Key Words:  CH4 oxidation, CH4 transport, isotope fractionation, methanogenic pathways, mulching, N application, tillage
Citation: Zhang, G. B., Ma, J., Yang, Y. T., Yu, H. Y., Shi, Y. P. and Xu, H. 2017. Variations of stable carbon isotopes of CH4 emission from three typical rice fields in China. Pedosphere. 27(1): 52-64.
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