Mitigation of Greenhouse Gas Emissions by Water Management in a Forage Rice Paddy Field Supplemented with Dry-Thermophilic Anaerobic Digestion Residue

文献类型： 外文期刊

第一作者： Riya, S.

作者： Riya, S.;Katayama, M.;Takahashi, E.;Terada, A.;Hosomi, M.;Zhou, S.

作者机构：

关键词： Methane;Forage rice;Water management;Methanogenic archaea;Dry-thermophilic anaerobic digestion;Biogas residue

期刊名称：WATER AIR AND SOIL POLLUTION （ 影响因子：2.52； 五年影响因子：2.574 ）

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收录情况： SCI

摘要： Dry-thermophilic anaerobic co-digestion (DTAD) can be used to treat forage rice straw and pig manure and generate biogas as an energy source. Solid residue produced from DTAD process can be used as a fertilizer in forage rice fields, while addition of the residue could increase methane (CH_4) and nitrous oxide (N_2O) emissions from the soil. We evaluated the effects of adding DTAD residue and water management on CH_4 and N_2O emissions from a forage rice field. Three treatments were evaluated: (a) 100 kg N·ha~(-1) chemical fertilizer and continuous flooding (CC); (b) residue addition (300 kg N·ha~(-1) DTAD residue) with continuous flooding (RC); and (c) residue addition with intermittent irrigation (RI). RC and RI showed higher CH_4 fluxes than CC throughout the growing period. After a midsummer drainage, RI showed higher soil Eh values and lower CH_4 fluxes (mean, 7.6 mg C·m~(-2)·h~(-1)) than those in RC (mean, 18.6 mg C·m~(-2)·h~(-1)). Abundance of mcrA gene copy number was not different between RC and RI, suggesting CH_4 flux was reduced by suppression of methanogenic activity by intermittent irrigation. Cumulative CH_4 emissions during the cultivation period were 105, 509, and 306 kg C·ha~(-1) in CC, RC, and RI, respectively. N_2O fluxes were within detection limits in all treatments. Our results, to our knowledge, are the first to show greenhouse gas emission from forage rice fields supplemented with DTAD residue and of the effectiveness of water management in CH_4 mitigation.

分类号： X

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