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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue Sep 2016, 37 (5)                                     Back


nstantaneous and historical temperature effects on a-pinene

Study on CH4 and N2O emissions from water-saving irrigation in Phaeozem paddy fields in cold areas

 

F. Q. Wang1,2*, W. Guo1, S. J. Zhu3 and X. L. Gong4

1Department of Water Conservancy Engineering, North China University of Water Resources and Electric Power,

Zhengzhou-450045, P. R. China

2Collaborative Innovation Center of Water Resources Efficient Utilization and Protection Engineering, Henan Province,

Zhengzhou 450045

3College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang-443002, P. R. China

4Key Laboratory of Water-saving Agriculture, Heilongjiang Education Department, Harbin-150030, P. R. China

*Corresponding Author E-mail: fortunewang@163.com

 

 Publication Data

Paper received:

21 February 2016

 

Revised received:

27 April 2016

 

Re-revised received:

5 May 2016

 

Accepted:

23 June 2016

 

Abstract

Increasing greenhouse gas emissions and water shortage are two main problems associated with cultivation of rice. Soil moisture control is not only a core technology in water-saving irrigation, but also a decisive factor of greenhouse gas emissions. The CH4 and N2O emission fluxes from intermittent irrigation and flooding irrigation in Phaeozem paddy fields in cold area were measured in-situ to provide a theoretical basis for studying the regulation of CH4 and N2O emissions and comprehensive assessing the effect of intermittent irrigation on the environment and control of greenhouse gas emissions. During the rice growing period, CH4 emissions peaked at the tillering stage, whilst N2O emissions peaked twice at the tillering and milky ripening stages. The accumulated emission of CH4 from the implementation of flooding irrigation in paddy fields was 6.46 gm-2, whilst that from intermittent irrigation was 5.47 gm-2. The accumulated emission of N2O from the implementation of flooding irrigation in paddy fields was 36.88 mgm-2, whilst that from intermittent irrigation was 68.47 mgm-2. The global warming potential of CH4 and N2O was 1362.71kgCO2 ha-1 from intermittent irrigation in paddy fields, a value 108.12 kgCO2 ha-1 lower than that from flooding irrigation. Intermittent irrigation can thus be used to effectively decrease and control the combined greenhouse effect of CH4 and N2O emissions from rice paddy fields.   

 

 

 Key words

Emission flux, Greenhouse effect, Greenhouse gas, Intermittent irrigation, Phaeozem in cold area, Water-saving irrigation

 

 

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