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Atmosphere 2018, 9(6), 212;

Impact of Management Practices on Methane Emissions from Paddy Grown on Mineral Soil over Peat in Central Hokkaido, Japan

Laboratory of Soil Science, Graduate School of Agriculture, Hokkaido University, Kita-Ku, Kita-9, Nishi-9, Sapporo 060-8589, Japan
Soil Science Division, Bangladesh Agricultural Research Institute, Joydebpur 1701, Gazipur, Bangladesh
Lowland Soils Lab, Bibai Branch, National Agricultural Research Center for Hokkaido Region, Bibai, Hokkaido 072-0045, Japan
Author to whom correspondence should be addressed.
Received: 15 January 2018 / Revised: 14 May 2018 / Accepted: 23 May 2018 / Published: 31 May 2018
(This article belongs to the Special Issue C and N Cycling and Greenhouse Gases Emission in Agroecosystem)
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This study was carried out at Kita-mura near Bibai located in central Hokkaido, Japan, with the intention of investigating the effects of different agronomical managements on CH4 emissions from paddy fields on mineral soil over peat under farmers’ actual management conditions in the snowy temperate region. Four fields were studied, including two fields with twice drainage (D1-M and D2-M) and also a single-drainage field (D3-S) under annual single-cropping and a paddy-fallow-paddy crop rotation as their systems. The other field was under single cropping annual with continuous flooding (CF-R) in the pattern of soybean (upland crop)-fallow-paddy. The mineral-soil thickness of these soil-dressed peatland fields varied from 20 to 47 cm. The amount of crop residues leftover in the fields ranged from 277 to 751 g dry matter m−2. Total CH4 emissions ranged from 25.3 to 116 g CH4-C m−2 per growing season. There was a significant relationship between crop-residue carbon (C) and total CH4 emissions during the rice-growing season. Methane fluxes from paddy soils had a strong interaction between readily available C source for methanogens and anaerobic conditions created by water management. Despite the differences in water regime and soil type, the average values of straw’s efficiency on CH4 production in this study were significantly higher than those of southern Japan and statistically identical with central Hokkaido. Our results suggest that the environmental conditions of central Hokkaido in association with crop-residue management had a significant influence on CH4 emission from paddy fields on mineral soil over peat. Rotation soybean (upland)-to-paddy followed by drainage-twice practices also largely reduces CH4 emission. However, mineral-soil dressing on peat could have a significant impact on suppression of CH4 emissions from beneath the peat reservoir. View Full-Text
Keywords: crop residues; water regime; crop rotation; temperate region crop residues; water regime; crop rotation; temperate region

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Naser, H.M.; Nagata, O.; Sultana, S.; Hatano, R. Impact of Management Practices on Methane Emissions from Paddy Grown on Mineral Soil over Peat in Central Hokkaido, Japan. Atmosphere 2018, 9, 212.

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