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Journal of Integrative Agriculture  2016, Vol. 15 Issue (3): 553-565    DOI: 10.1016/S2095-3119(15)61206-0
Physiology·Biochemistry·Cultivation·Tillage Advanced Online Publication | Current Issue | Archive | Adv Search |
Winter cover crops alter methanotrophs community structure in a double-rice paddy soil
 LIU Jing-na, ZHU Bo, YI Li-xia, DAI Hong-cui, XU He-shui, ZHANG Kai, HU Yue-gao, ZENG Zhao-hai
1、College of Agriculture and Biotechnology, China Agricultural University, Beijing 100193, P.R.China
2、School of Agronomy, Yangtze University, Jingzhou 434025, P.R.China
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摘要  Methanotrophs play a vital role in the mitigation of methane emission from soils. However, the influences of cover crops incorporation on paddy soil methanotrophic community structure have not been fully understood. In this study, the impacts of two winter cover crops (Chinese milk vetch (Astragalus sinicus L.) and ryegrass (Lolium multiflorum Lam.), representing leguminous and non-leguminous cover crops, respectively) on community structure and abundance of methanotrophs were evaluated by using PCR-DGGE (polymerase chain reaction-denaturing gradient gel electrophoresis) and real-time PCR technology in a double-rice cropping system from South China. Four treatments were established in a completely randomized block design: 1) double-rice cropping without nitrogen fertilizer application, CK; 2) double-rice cropping with chemical nitrogen fertilizer application (200 kg ha–1 urea for entire double-rice season), CF; 3) Chinese milk vetch cropping followed by double-rice cultivation with Chinese milk vetch incorporation, MV; 4) ryegrass cropping followed by double-rice cultivation with ryegrass incorporation, RG. Results showed that cultivating Chinese milk vetch and ryegrass in fallow season decreased soil bulk density and increased rice yield in different extents by comparison with CK. Additionally, methanotrophic bacterial abundance and community structure changed significantly with rice growth. Methanotrophic bacterial pmoA gene copies in four treatments were higher during late-rice season (3.18×107 to 10.28×107 copies g–1 dry soil) by comparison with early-rice season (2.1×107 to 9.62×107 copies g–1 dry soil). Type I methanotrophs absolutely predominated during early-rice season. However, the advantage of type I methanotrophs kept narrowing during entire double-rice season and both types I and II methanotrophs dominated at later stage of late-rice.

Abstract  Methanotrophs play a vital role in the mitigation of methane emission from soils. However, the influences of cover crops incorporation on paddy soil methanotrophic community structure have not been fully understood. In this study, the impacts of two winter cover crops (Chinese milk vetch (Astragalus sinicus L.) and ryegrass (Lolium multiflorum Lam.), representing leguminous and non-leguminous cover crops, respectively) on community structure and abundance of methanotrophs were evaluated by using PCR-DGGE (polymerase chain reaction-denaturing gradient gel electrophoresis) and real-time PCR technology in a double-rice cropping system from South China. Four treatments were established in a completely randomized block design: 1) double-rice cropping without nitrogen fertilizer application, CK; 2) double-rice cropping with chemical nitrogen fertilizer application (200 kg ha–1 urea for entire double-rice season), CF; 3) Chinese milk vetch cropping followed by double-rice cultivation with Chinese milk vetch incorporation, MV; 4) ryegrass cropping followed by double-rice cultivation with ryegrass incorporation, RG. Results showed that cultivating Chinese milk vetch and ryegrass in fallow season decreased soil bulk density and increased rice yield in different extents by comparison with CK. Additionally, methanotrophic bacterial abundance and community structure changed significantly with rice growth. Methanotrophic bacterial pmoA gene copies in four treatments were higher during late-rice season (3.18×107 to 10.28×107 copies g–1 dry soil) by comparison with early-rice season (2.1×107 to 9.62×107 copies g–1 dry soil). Type I methanotrophs absolutely predominated during early-rice season. However, the advantage of type I methanotrophs kept narrowing during entire double-rice season and both types I and II methanotrophs dominated at later stage of late-rice.
Keywords:  Chinese milk vetch       ryegrass       methanotrophic bacteria       community structure       double-rice  
Received: 29 April 2015   Accepted:
Fund: 

This study was supported by the National Natural Science Foundation of China (31171509 and 30671222), the Special Fund for Agro-scientific Research in the Public Interest, China (201103001), and the National Key Technology R&D Program for the 12th Five-Year Plan period (2011BAD16B15).

Corresponding Authors:  ZENG Zhao-hai,Tel: +86-10-62733847, Mobile: +86-13911686202, Fax: +86-10-62732441, E-mail: zengzhaohai@cau.edu.cn     E-mail:  zengzhaohai@cau.edu.cn
About author:  LIU Jing-na, E-mail: liujingna199066@126.com; ZHU Bo,E-mail: 1984zhubo@163.com;* These authors contributed equally to this study

Cite this article: 

LIU Jing-na, ZHU Bo, YI Li-xia, DAI Hong-cui, XU He-shui, ZHANG Kai, HU Yue-gao, ZENG Zhao-hai. 2016. Winter cover crops alter methanotrophs community structure in a double-rice paddy soil. Journal of Integrative Agriculture, 15(3): 553-565.

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