Methane emission from rice fields as affected by land use change

被引：34

作者：

Eusufzai, Moniruzzaman Khan ^{[1
]}

Tokida, Takeshi ^{[2
,3
]}

Okada, Masumi ^{[4
]}

Sugiyama, Shu-ichi ^{[5
]}

Liu, Guang Cheng ^{[4
]}

Nakajima, Miyuki ^{[1
]}

Sameshima, Ryoji ^{[1
]}

机构：

[1] Natl Agr Res Ctr Tohoku Reg NARCT, Climate Change Res Team, Morioka, Iwate 0200198, Japan

[2] Natl Inst Agroenvironm Sci, Tsukuba, Ibaraki 3058604, Japan

[3] Japan Soc Promot Sci, Tokyo 1028471, Japan

[4] Iwate Univ, Fac Agr, Dept Agrobiosci, Morioka, Iwate 0208550, Japan

[5] Hirosaki Univ, Dept Biol Sci, Fac Agr, Hirosaki, Aomori 0368560, Japan

来源：

AGRICULTURE ECOSYSTEMS & ENVIRONMENT | 2010年 / 139卷 / 04期

关键词：

Rice paddy; Land conversion; Methane; Electron donor; Electron acceptor; Methanogens; METHANOGENIC ARCHAEAL COMMUNITY; FE(III) OXIDE REDUCTION; SEQUENTIAL REDUCTION; CHEMICAL-PROPERTIES; FERRIC IRON; PADDY SOIL; BACTERIA; WATER; CH4; CO2;

D O I：

10.1016/j.agee.2010.11.003

中图分类号：

S [农业科学];

学科分类号：

09 ;

摘要：

The purpose of this study was to evaluate how former upland cultivation history affects CH4 emission from rice paddies. We measured CH4 flux, methanogen population and in situ Fe(III) reduction in the rice paddies following three different lengths of time since upland crop (Soybean) cultivation. Results showed that CH4 emissions from long-term rice paddy (19 year's continuous cultivation) were significantly higher than recently converted ones. Temporal dynamics of methanogens on rice roots also varied among the plots, and showed a good correlation with CH4 emission rates. Cumulative Fe(III) reduction acted as the dominant electron acceptor in all plots, accounting for 68-94% of the total electron consumption. Fe(II) concentration was highest in the 19-year plot and lowest in the 1-year plots, indicating lower electron availability in recently converted paddies necessary for Fe reduction and CH4 production. Anoxic laboratory soil incubation also suggested poor availability of electron donors in the recent paddies. Collectively, our results demonstrate that the conversion of upland to paddy rice cultivation significantly affected CH4 emission through changing availability of electron donors, redox status of soil Fe and activity of methanogens, which ultimately caused low CH4 emissions. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：742 / 748

页数：7