The University of Shiga Prefecture · Faculty of Environmental Science / Department of Bioresource Management

Research keywordsalternate wetting and drying irrigation・methane emissions・subsurface irrigation・porous media・rice cultivation・low-pressure irrigation

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• Effect of infiltration rate on methane emission properties in pot-cultured rice under alternate wetting and drying irrigation2022 · 記述言語： 英語 掲載種別： 研究論文（学術雑誌） 出版者・発行元： Irrigation and Drainage Alternate wetting and drying (AWD) irrigation is effective at reducing methane (CH4) emissions in rice cultivation. To investigate the effect of the infiltration rate on AWD effectiveness in terms of CH4 emissions, rice was cultivated in pots with three different infiltration rates under AWD. Under intermittent irrigation, the soil was more oxidative than is generally required for CH4 production (redox potential [Eh] > −150 mV), regardless of the infiltration rate. CH4 emission was suppressed by at least 37% compared to continuous flooding and no-infiltration conditions; however, temporarily elevated emission caused by drainage below saturation was observed 1–2 h after the flooding receded. This result is important for accurately determining CH4 emissions in water management techniques such as AWD. CH4 emissions during the heading stage, including temporarily elevated emissions after flooding receded, were greatest under the highest infiltration rate (18 mm day−1). The infiltration rate did not affect the rate of soil Eh reduction; however, the total organic carbon concentration in the drainage water suggested that more carbon, a methanogen substrate, migrated to the bottom of the pot with increasing infiltration rate, which likely increased CH4 emissions. This study will aid in the examination of ponding water management techniques to control CH4 emissions in rice production. DOI： 10.1002/ird.2756 Scopus その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85139007086&origin=inward
• DISCUSSION about the RISK CONTROL in LAKE BIWA BASIN BASED on the LANDSCAPE ARCHITECTURE2021 · 記述言語： 英語 掲載種別： 研究論文（学術雑誌） 出版者・発行元： 42nd Asian Conference on Remote Sensing, ACRS 2021 Shiga Prefecture, Japan, is one catchment that constitutes a large basin surrounded by mountains such as Mt. Hiei, Mt. Hira, Mt. Ibuki, Gozaishodake and Suzuka Mountains. In the center, there is Lake Biwa occupying one-sixths of the total area of the prefecture. Lake Biwa has been a precious water source for Osaka and Kyoto. We created a landscape image of the entire catchment by overlaying the SRTM_DEM image measured by the space shuttle Endeavor in 2000 and Landsat image. From this image, we attempted to forecast the impacts on the regional environments due to the wind trail crossing Lake Biwa, microclimates along the lake coast, training at the time of typhoon visit, development of a large-scale housing complex, mega solar power plant project, and so on. In order to foresee the regional environments and disaster risks, we believe that an extensive systematic structure including hydrology, remote sensing and geographic information system becomes necessary from now on. Considering the disastrous cases in the recent several years in Japan such as landslides and flooding engulfing houses, understanding of detailed landscape architectures in each region is strongly encouraged from the standpoint of risk management when construction of a mega solar power station or a large-scale housing complex is planned on a slope of a mountain or a wetland regarded as a retarding basin. Scopus その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85127417623&origin=inward
• 多孔質管地中灌漑の実用性向上について－低正圧間断灌漑の実用性と負圧連続灌漑による根巻き防止効果－2006 · 記述言語： 日本語 掲載種別： 研究論文（学術雑誌） 出版者・発行元： 農業土木学会 参加形態： 共同（主担当）
• 地中連続灌漑における多孔質媒体の差異が給水特性に与える影響2006 · 記述言語： 日本語 掲載種別： 研究論文（学術雑誌） 出版者・発行元： 農業土木学会 参加形態： 共同（主担当）

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