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In this study, quick and effective sampling method of dissolved gas in the water was developed, and the potential of generation and emission of N2O and CH4 in a shallow eutrophic pond was evaluated. On-site quick and effective dissolved gas sampling method was developed through following steps: 1) take water sample into just a half volume of the gas-sampling vessel, 2) shake the vessel and take the gas-phase inside the vessel into a gas-saving bag, 3) simultaneously measure the water temperature for gas solubility calculation and take the around air for back ground gas concentration adjustment. The results indicated that in shallow eutrophic ponds, generation and emission of N2O could be reduced as the result of phytoplankton’s propagation on competition of inorganic nitrogen uptake with nitrifying microbes, especially under nitrogen-limited condition. In such ponds, generation and emission of CH4 could also be reduced as the result of keeping whole water layer of the pond oxic by both DO supply by phytoplankton and mixing the pond water by wind. It was suggested that the existence of phytoplankton had a large effect on generation and emission of N2O and CH4, and that they also made a contribution to control of N2O and CH4 to no small extent.

nihon mizushori seibutsu gakkaishi

Evaluation of Generation and Emission Potential of N&lt;sub&gt;2&lt;/sub&gt;O and CH&lt;sub&gt;4&lt;/sub&gt; from Water Environment using Newly Improved Quick and Effective Sampling Method of Dissolved Gas