Masahiko Sekine

Yamaguchi University

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Co-Authors

Tsuyoshi Imai

Yamaguchi University

144

Takaya Higuchi

Yamaguchi University

129

Masao Ukita

Yamaguchi University

Ariyo KANNO

Yamaguchi University

Kōichi Yamamoto

Osaka University

Hiroshi Nakanishi

Yasuda Women's University

Masayo Ukita

Kyoto University

Masayuki Fukagawa

National Institute of Technology, Ube College

Koichi Yamamoto

Yamaguchi University

Munetaka Nakata

Tokyo University of Agriculture and Technology

Cooperative Institutions

Yamaguchi University

112

The University of Tokyo

Kyushu University

Kyoto University

Japan Society of Civil Engineers

Tokyo University of Agriculture and Technology

Hiroshima University

Osaka University

Tokiwa Park

National Institute of Technology, Ube College

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Microplastics in the sediments of small-scale Japanese rivers: Abundance and distribution, characterization, sources-to-sink, and ecological risks

The Science of The Total Environment (2021)

A. H. M. Enamul Kabir Masahiko Sekine Tsuyoshi Imai Kōichi Yamamoto Ariyo KANNO

Polypropylene

10.1016/j.scitotenv.2021.152590

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Citations (77)

Screening of Soil-Born Fungi from Forest Soil Using Glyphosate Herbicide as the Sole Source of Phosphorus

Journal of Water and Environment Technology (2011)

Novi Arfarita Tsuyoshi Imai Ariyo KANNO Takaya Higuchi Koichi Yamamoto

Glyphosate herbicide was used as screening agent to be the sole source of phosphorus for the isolation of soil-born fungi of forest soil. Three fungal strains were able to grow consistently in the presence of glyphosate as the sole phosphorus source and were identified as Fusarium sp. strain FRP1, Scopulariopsis sp. strain FRP2 and Trichoderma sp. strain FRP3. On standard medium ten fungal strains were isolated and identified as Botrytis sp. strain FR1, Mucor sp. strain FR2, Acremonium sp. strain FR3, Trichoderma sp. strain FR4, Botrytis sp. strain FR5, Crysosporium sp. strain FR6, Scopulariopsis sp. strain FR7, Trichoderma sp. strain FR8, Botrytis sp. strain FR9 and Acremonium sp. strain FR10. Of the three screened fungal species, Scopulariopsis sp. strain FRP2 and Trichoderma sp. strain FRP3 were selected for further study because they had the highest ratio of growth diameter. The growth kinetics of Scopulariopsis sp. strain FRP2 and Trichoderma sp. strain FRP3 were also observed on broth Czapek medium containing glyphosate as the sole source of phosphorus. Synergetic interactions in vitro were examined on PDA. The synergetic interactions of Scopulariopsis sp. strain FRP2 and Trichoderma sp. strain FRP3 as mix culture showed antibiosis inhibition mode.

Trichoderma

Strain (injury)

Botrytis

Acremonium

10.2965/jwet.2011.391

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Citations (15)

STUDY ON NUTRIENT FLOW OUT PROCESS FROM NONPOINTSOURCE BASED ON A CONTINUOUS SURVEY

PROCEEDINGS OF ENVIRONMENTAL AND SANITARY ENGINEERING RESEARCH (1988)

Masahiko Sekine Masao Ukita Hiroshi Nakanishi Taizo Mashino

10.11532/proes1983.24.273

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Citations (0)

Study on fish preservation efficiency of revetment blocks based on laboratory experiments

Environmental Engineering Research (2008)

Ryoichi Nakamura Masahiko Sekine Asami Hashiguchi Takaya Higucchi Tsuyoshi Imai

Revetment

10.11532/proes1992.45.507

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Citations (1)

PRESENT CONDITION OF THE COASTAL EROSION IN THE ISLANDS IN RIAU PROVINCE, INDONESIA

Journal of Japan Society of Civil Engineers Ser G (Environmental Research) (2017)

Hiroki Kagawa Koichi Yamamoto Muhammad Haidar Ariyo KANNO Yoshihisa AKAMATSU

インドネシア共和国リアウ州ブンカリス島の北岸では海岸侵食が進行している．侵食が進行している土地は主に泥炭地であり，侵食が大きい北岸部では，ボグバーストと呼ばれる泥炭地崩壊の跡が発見された．ランサン島や近隣島嶼域でもボグバーストのような泥炭地崩壊が見られ，ブンカリス島と同様の泥炭地崩壊が進行していると考えられた．LANDSAT画像の解析により，リアウ州では年間約160haの土地が海岸侵食により失われていることがわかった．マングローブが存在しない場所では存在する場所に比較して侵食速度が大きいことがわかった．ブンカリス島の北岸においてはボグバーストだけで2010年時点で11万tの泥炭由来の炭素が海洋に流出していると推定された．

Coastal erosion

10.2208/jscejer.73.iii_213

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Citations (1)

Ecology and Civil Engineering (2007)

Masahiko Sekine Masuji GOTO Nobuyuki Ito Koji TANAKA Mitsuhiro KANAO

ゲンジボタルの周辺環境に対する生息場適性基準,ゲンジボタルとカワニナの流水環境に対する生息場適性基準を作成し,PHABSIMの手法を援用して,椹野川のゲンジボタルの生息適地を探索した.その結果,ゲンジボタル生息適地としては椹野川本川中流域の生息条件はあまり良好ではないことが明らかとなった.また,選定されたホタル水路建設予定地については,巨視的には良好な周辺環境であるとは言えないこと,微視的にはゲンジボタルの生息が可能な要素がほぼ揃っており,ゲンジボタル生息の可能性があることを指摘した.次に,PHABSIMを用いてホタル水路建設予定地の流水環境評価を行い,ホタル水路建設予定地は現況のままではゲンジボタルとカワニナの流水環境としては良好でないことを指摘し,水路のわずかな手直しによって比較的良好な流水環境が実現できることを示した.また適切な維持流量として0.06m3/secをあげ,河床へのシルト堆積や藻類繁茂が見られる場合には0.2m3/sec程度まで一時的に流量を高めればよいことを指摘した.さらに,竣工後のホタル幼虫の上陸調査により,PHABSIMにおいて生息場としての評価が高い区間で多くの幼虫上陸が見られることを示した.

10.3825/ece.10.103

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Citations (1)

STUDY ON FLOW DOWN PROCES S OF NUTRIENTS IN A RIVER BASED ON A CONTINUOUS SURVEY FOR A LONG PERIOD

Environmental Engineering Research (1987)

Masahiko Sekine Masao Ukita Hiroshi Nakanishi 奥川光治

10.11532/proes1983.23.65

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Citations (0)

Detection of Zostera marine habitat in Yamaguchi Bay

Environmental Engineering Research (2004)

Shoichi Okabe Masahiko Sekine Masao Ukita Tuyoshi Imai Takaya Higuchi