Water management influencing methane and nitrous oxide emissions from rice field in relation to soil redox and microbial community

Document Type

Article

Publication Date

10-1-2006

Abstract

Methane (CH4) and nitrous oxide (N2O) emissions from an irrigated rice field under continuous flooding and intermittent irrigation water management practices in northern China were measured in situ by the static chamber technique during May to October in 2000. The intermittent irrigation reduced total growing-season CH4 emission by 24.22% but increased N2 O emission by 23.72%, when compared with the continuous flooding. Soil Eh and four related bacterial groups were also measured to clarify their effects on gaseous emissions. Three ranges of soil redox potential were related to gas emissions: below -100 mV with vigorous CH4 emission, above +100 mV with significant N2 O emission, and +100 to -100 mV with little CH4 and N2 O emissions. Intermittently draining the field increased soil oxidation, with a decrease in CH4 emission and an increase in N2 O emission. In general the mid-season drainage slightly increased the populations of methanotrophs, nitrifiers, and denitrifiers but decreased that of methanogens. Copyright © Taylor & Francis Group, LLC.

Publication Source (Journal or Book title)

Communications in Soil Science and Plant Analysis

First Page

1889

Last Page

1903

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