Methane in groundwater used for Japanese agribulture: Its relationship to other physico-chemical properties and possible tropospheric source strength

Details Methane in groundwater used for Japanese agribulture: Its relationship to other physico-chemical properties and possible tropospheric source strength Methane in groundwater used for Japanese agribulture: Its relationship to other physico-chemical properties and possible tropospheric source strength

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21...41w&link_type=abstract

Geophysical Research Letters, Volume 21, Issue 1, p. 41-42

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Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions, Atmospheric Composition And Structure: Geochemical Cycles, Hydrology: Irrigation

Scientific paper

The concentration of CH4 in 131 groundwater samples used for agriculture in Aichi Prefecture, central Japan, averaged 1.58 mgCl-1 for those water samples above detection (>0.006 mgCl-1), with the highest value of 18.4 mgCl-1. Methane was detected in more than half of the groundwater samples. The amount of CH4 released to the atmosphere because of agricultural groundwater use was estimated to be 2.00×107 gC yr-1 for a cultivated area of 8.61×104ha, or about 1.4% of the CH4 production in paddy fields derived from soil organic matter in the same geographic area. Distribution of measurements of redox potential (Eh), chemical oxygen demand (COD), Fe, Mn, NH4-N, and NO3-N was clearly different between the CH4-detected and undetected samples; Eh values and NO3-N concentrations were lower while the other four factors were higher in the CH4-detected samples.

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