Contribution of nitrous oxide emission from soil covered with plastic mulch film in vegetable field

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The effects of soil mulching on the emission of nitrous oxide (N2O), a major greenhouse gas, from arable fields have rarely been investigated to date. In a previous study, we showed that a significant amount of N2O is emitted to the atmosphere from an arable field in which soil is covered with plastic mulch films; N2O is emitted both by permeation through the mulch films and by horizontal diffusion to the adjacent furrow soil surface. We continued measuring the N2O flux from a field grown to lettuce and carrots for two years. With the results of our previous study, we also estimated the contribution of N2O emitted during soil mulching to the cumulative emission. In winter, the contribution of N2O emission during soil mulching was low, ranging from 4 to 12 %. In contrast, in summer, the contribution of N2O emission during soil mulching after fertilization was high, ranging from 41 to 66 % of the cumulative emission. Among these, the contribution of N2O emission by permeation through the mulch film was found to be particularly important, which ranged from 33 to 53 % of the cumulative emission. These results indicate that N2O emission during soil mulching largely contributes to cumulative emission.

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  • 農業気象

    農業気象 70 (2), 117-125, 2014

    日本農業気象学会

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