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- Kasuya, Masahiro, et al. Show all 3 Authors
- Soil science and plant nutrition 2014 v.60 no.4 pp. 551-564
- Oryza sativa; Soil and Water Assessment Tool model; agricultural management; drainage; evapotranspiration; humans; irrigation scheduling; land use; paddies; rice; rivers; runoff; simulation models; water balance; water quality; watershed hydrology; watersheds; Asia
- ... The Soil and Water Assessment Tool (SWAT), a basin-scale hydrological and water quality simulation model, has become popular in Asia for assessing the impacts of land use and human activities including paddy rice (Oryza sativa L.) cultivation which is a typical agricultural management system in Asia. The water ponding and drainage management in paddy fields should significantly affect the regional ...
- Kasuya, Masahiro, et al. Show all 7 Authors
- Journal of environmental quality 2009 v.38 no.6 pp. 2198-2209
- agricultural land; riparian areas; alluvium; denitrification; aquifers; highlands; groundwater; nitrate nitrogen; soil organic carbon; surface water; soil depth; groundwater recharge; climate change; solutes; hydrochemistry; stable isotopes; bicarbonates; heterotrophs
- ... Denitrification hotspots in riparian aquifers often develop in a relatively narrow zone at the upland–riparian interface, where nitrate-rich ground water of upland origin interacts with available soil organic carbon. In riparian paddy fields, denitrification in the aquifer has received less attention than that in the surface water and soil. This study aimed to determine the in situ activity of the ...
- Kasuya, Masahiro, et al. Show all 6 Authors
- Agriculture, ecosystems & environment 2008 v.127 no.3-4 pp. 207-214
- groundwater; methane; seasonal variation; spatial variation; irrigation water; gas emissions; biogeochemical cycles; carbon; global warming; geographical variation; water table; agricultural land; paddy soils; stable isotopes; carbon dioxide; methanogens; glucose; oxidation; aerobic conditions; hydrochemistry; Japan
- ... It is important to estimate the amount of CH₄ released following the use of groundwater and to understand the dynamics of groundwater CH₄ from the viewpoints of biogeochemical C cycle and global warming. We determined CH₄ concentration in 216 groundwaters used for agriculture in Aichi Prefecture, central Japan, and analyzed the spatial and seasonal variations. The percentage of CH₄-detected sample ...