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Methane Oxidation in Subsoil Leached from Plow Layer of Paddy Field

稻田犁层淋溶下土的甲烷氧化

基本信息

批准号：
03660067
负责人：
KIMURA Makoto
金额：
$ 1.28万
依托单位：
NAGOYA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03660067/
关键词：
Methane Methane flux Water soluble organic matter Oxidation Earth warming Paddy soil Subsoil percolating water メタン酸化透水

项目摘要

Retention and oxidation in subsoil of ferrous iron percolated from plow layer were well known in paddy fields. This finding suggested the possibility of methane oxidation in subsoil percolated from the plow layer. The followings are the first results of methane oxidation in subsoil of paddy fields.1.The amounts of methane percolated to subsoil increased proportionally with the increase of amounts of percolating water. The growth of rice plant decreased the amounts of methane percolation to subsoil due to accelerating the methane fluxes to the atmosphere. The percolated methane to subsoil was more than 10% of the amounts of methane to the atmosphere.2.Large portion of methane dissolved in percolating water was oxidized in subsoil. But the remained methane was considered to be carried to the lower parts of subsoil without oxidation. This was because the anaerobic oxidation of methane requires organic substrates by methane oxidizing microorganisms, and the substrates in percolating water were not enough for complete oxidation of methane.3.Subsoil decomposed and/or retained the organic materials percolated from plow layer with percolating water. The subsoil of Fukushima soil both decomposed and retained methane, while that of Anjo soil mainly retained methane without its appreciable oxidation.4.The amounts of methane oxidation in subsoil were also different between soils; Fukushima soil oxidized methane significantly while Anjo soil did it only in small amounts.

水稻田耕作层中二价铁在底土中的滞留和氧化是众所周知的。这一发现表明，甲烷氧化的可能性，在底土从犁层。稻田底土中甲烷氧化的初步结果如下：1.随着灌水量的增加，甲烷氧化到底土中的量成比例增加。水稻的生长加速了甲烷向大气的排放，从而减少了甲烷向下层土壤的渗漏量。2.溶解在地下水中的甲烷大部分在地下被氧化。但残留的甲烷被认为是被带到下层土壤中而没有被氧化。这是因为甲烷厌氧氧化需要甲烷氧化微生物的有机基质，而消毒水中的基质不足以完全氧化甲烷。3.下层土壤被消毒水分解和/或截留了耕层中的有机物质。福岛土壤的甲烷氧化量也存在差异，福岛土壤对甲烷的氧化作用显著，而安城土壤对甲烷的氧化作用不明显。