Title |
Professor |
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FUJIKAWA Tomonori Professor |
From Graduate School 【 display / non-display 】
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The University of Tokyo Doctor Course Completed
1999.04 - 2002.03
Country:Japan
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The University of Tokyo Master Course Completed
1997.04 - 1999.03
Country:Japan
Employment Record in Research 【 display / non-display 】
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Tokyo University of Agriculture Faculty of Regional Environment Science Department of Bioproduction and Environment Engineering Assistant Professor
2008.04 - 2013.09
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Tokyo University of Agriculture Faculty of Regional Environment Science Department of Bioproduction and Environment Engineering Associate Professor
2013.10 - 2017.03
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Tokyo University of Agriculture Faculty of Regional Environment Science Department of Regional Regeneration Science Professor
2017.04
Papers 【 display / non-display 】
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Assessing the pore size distribution of architectural greening soils and materials for wall greening based on their physical properties
ASAI Toshimitsu, FUJIKAWA Tomonori, FUJITA Shigeru, MAKI Takashi, MORII Hiroyuki, SHIRAI Hiroyuki, KANEKO Takanori
Journal of the Japanese Society of Soil Physics 154 ( 0 ) 11 - 18 2023.07
Language:Japanese Publisher:Japanese Society of Soil Physics
Artificial lightweight and porous materials (i.e., architectural greening soils and materials) are often used in the rooftops and wall greening of buildings. It is important for the designers of the system to understand the physical properties of architectural greening soils and materials to save the amount of water and fertilizer used, which directly affects maintenance costs. The aims of this study were to assess the pore size distribution of architectural greening soils and materials for wall greening based on their physical properties. According to water retention measurements, rapid drainage will occur at particular matric potentials for certain architectural greening soils and materials. The pore size distributions of architectural greening soils and materials estimated from water retention curves suggested that the architectural greening soils and materials used in this study can be classified into two groups: (i) materials that include only relatively large pores with diameters from 0.001 to 0.01 cm, (ii) materials also include relatively small pores with diameters from 0.0002 to 0.001 cm. The classification of architectural greening soils and materials by pore size distribution could be affected by their manufacturing processes. The values of saturated hydraulic conductivity of the materials ranged from 10^0 to 10^{-2} cm s^{-1}. Furthermore, hydraulic conductivity tended to increase with total porosity of the architectural greening soils and materials except that whose pores were made by forming.
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Changes in Growth of <i>Egeria densa</i> in Shading Conditions
ASAI Toshimitsu, FUJIKAWA Tomonori, TAKEUCHI Yasushi, SUZUKI Shinichi, NAKAMURA Yoshio
Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering 90 ( 1 ) I_209 - I_216 2022
Language:Japanese Publisher:The Japanese Society of Irrigation, Drainage and Rural Engineering
<p>This study aimed to develop a new method to control <i>Egeria densa</i>, which overgrows in agricultural irrigation canals. We conducted two experiments (one in the laboratory and one in the field), focused on changes in light conditions and the growth of <i>E. densa</i>. In the laboratory experiment, the maximum tensile load of the stems was significantly reduced when the light was shaded to about 20 μmol·m<sup>-2</sup>·s<sup>-1 </sup>(1,400 lx). We discovered that shading exerted a significant negative effect on the number of roots. Furthermore, in the field experiment, which was conducted in an actual agricultural canal, the maximum tensile load on stems was reduced in both the 85-90% and 95-98% shade plots. In particular, in the 95-98% shade plot, the tensile load was reduced to about half of that in the control plot (non-shade) during the high grow season from August to October.</p>
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Evaluating Ion Exchange Capacity of Molten Slag for Hydroponic System
FUENTES ANTONIO PEREZ, MASKEY SARVESH, OKAZAWA HIROMU, YAMAZAKI YURI, FUJIKAWA TOMONORI, ASAI TOSHIMITSU
International Journal of Environmental and Rural Development 13 ( 1 ) 130 - 135 2022
Language:English Publisher:Institute of Environmental Rehabilitation and Conservation, Research Center
<p>Hydroponic farming promotes high-efficiency water, fertilizers, and high productivity under a controlled environment. However, the use of this system needs consistent application of fertilizers, increasing the cost of operations. Molten Slag (MS), a waste from the Municipal Solid Waste Incineration has essential nutrients that can be used as fertilizer. The objective of this study was to clarify the releasing process of nutrients by molten slag to be applied as a substrate in hydroponic system. For this, anion and cation contents of three varieties of Molten Slag (MS1, MS2, MS3) were determined in the laboratory by a shaking method. The nutrient content, P<sub>2</sub>O<sub>5</sub>, K<sub>2</sub>O, MgO and CaO were in MS1, MS3 and MS2. The quantification ion released was performed at 1, 6, 12 and 24 hours. It was observed that MS3 had performed the best condition in the releasing process of K<sup>+</sup>, Mg<sup>+</sup>, SO<sub>4</sub><sup>2-</sup> and Cl<sup>-</sup>. Although MS1 had higher nutrient content, MS3 released higher contents of those minerals among the samples. According to the result of this study, it was confirmed that MS3 has a high potential for hydroponic farming.</p>
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Changes in Soil Physical and Chemical Properties with Depth due to Megascolicidae Movements
KANEKO TAKANORI, FUJIKAWA TOMONORI, MIHARA MACHITO
International Journal of Environmental and Rural Development 11 ( 2 ) 146 - 153 2020
Language:English Publisher:Institute of Environmental Rehabilitation and Conservation, Research Center
<p>Earthworms have significant impacts on the physical and chemical properties of soils. It is known that they are remarkably improving soil fertility as well as promoting plant growth because earthworms make castings, which are rich in nitrogen, phosphorus and other nutrients. Additionally, earthworm’s movements effects soil properties by their movements in the soil, notably soil aggregates, nitrogen and phosphorus concentration. Earthworms from Megascolecidae family are a major earthworms found in Japan, but there is lack of knowledge on its effect on soil properties compared to other earthworms. Subsequently, this study discusses the changes in soil aggregates, nitrogen and phosphorus concentration changes with depth due to Megascolicidae movements in the soil. An experiment was conducted using cylindrical columns of 12 cm height divided into 3 layers at 4 cm interval. Additionally, two groups were made, with litter and without litter, which were divided into subgroups with variations in earthworm numbers. The results of aggregates showed the tendency of aggregate formation in both the groups, with high formation rate in litter added group. The results of NO<sub>3</sub> and P<sub>2</sub>O<sub>5</sub> content significantly differed among the 3 layers in the treatments. The trend of higher NO<sub>3</sub>-N and P<sub>2</sub>O<sub>5</sub> concentration was observed in middle layer and lower layer respectively. According to the results obtained, Megascolicidae movements effect the distribution of nutrients in subsurface soils.</p>
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Study on Extermination of <i>Egeria densa</i> by Shading Nets in Agricultural Irrigation Canal
ASAI Toshimitsu, FUJIKAWA Tomonori, TAKEUCHI Yasushi, NAKAMURA Yoshio, SUZUKI Shinichi
Water,Land and Environmental Engineering 88 ( 11 ) 893 - 897,a1 2020
Language:Japanese Publisher:The Japanese Society of Irrigation Drainage and Rural Engineering
Books and Other Publications 【 display / non-display 】
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基礎から学ぶ水理学
岡澤 宏,中桐 貴生,竹下 伸一,長坂 貞郎,藤川 智紀,山本 忠男( Role: Joint author , 第3章 水の運動 p.63-92 )
理工図書 2017.09 ( ISBN:4844608614 )
Total pages:228 Language:Japanese Book type:Textbook, survey, introduction
水の流れに関する水理学について解説する書籍の中で,水の流れの解析の基本となる用語の定義や運動方程式を用いた水の流れの表現に関する項目である。
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新版 地域環境科学概論
藤川智紀 (東京農業大学地域環境科学部編)( Role: Joint author , pp.155-162)
理工図書株式会社 2014.04 ( ISBN:978-4-8446-0825-7 )
Language:Japanese Book type:Textbook, survey, introduction
自然環境における物質循環について,熱力学的な系と物質循環・物質収支の概念について解説した。また,環境問題の多くに関係している地球規模での炭素循環について,その特徴や分析方法を紹介した。
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我が国における食料自給率向上への提言[PART-3]耕作放棄地の解消を考える
藤川智紀 (編著者 板垣啓四郞)( Role: Joint author , 第8章耕作放棄地の復元と圃場の有効利用 p.139-154)
筑波書房 2013.03 ( ISBN:978-4-8119-0419-1 )
Language:Japanese Book type:Scholarly book
耕作放棄による農地土壌の理化学性および農村環境の変化を圃場整備方法や農地の管理方法の観点からまとめた。つづいて耕作放棄による土壌の理化学性の劣化が農地として復元する際にどの様な影響を与えるか考察すると共に、実際に耕作放棄地を再整備によって復元した山梨県の例を挙げ、効果的な復元方法について提案した。
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我が国における食料自給率向上への提言[PART-2]
藤川智紀 (編著者 板垣啓四郎)( Role: Joint author , 第8章自給率向上と環境負荷の低減を目指す田畑輪換 p.125-142)
筑波書房 2012.03 ( ISBN:978-4-8119-0401-6 )
Language:Japanese Book type:Scholarly book
農地の田畑輪換による自給率向上の技術的方策を検討することを目的に、田畑輪換を導入するための条件と技術を述べるともに、それによる土壌理化学性と作物生育の変化および環境負荷の変化を分析して、田畑輪換導入に向けた提案を試みた。
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食と農と資源 -環境時代のエコ・テクノロジー-
藤川智紀 (編著者 中村好男, 豊田裕道)( Role: Joint author)
共立出版 2010.10 ( ISBN:9784620057074 )
Language:Japanese Book type:Scholarly book
農作業によって農地から発生する環境負荷について、農作業が土壌の理化学性や土壌中の炭素・窒素挙動に与える影響に注目してまとめた。環境負荷としては大気への温室効果ガスの放出や地下水への硝酸態窒素の溶脱などを取り上げ、その発生メカニズムと抑制方法について記載した。
Misc 【 display / non-display 】
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Extraction of Soil Gas by using an Improved Gas Sampler
Hiromi IMOTO,Tomonori FUJIKAWA,Masaru MIZOGUCHI,Tsuyoshi MIYAZAKI
Journal of the Japanese Society of Soil Physics 93 51 - 55 2003.03
Language:Japanese Publishing type:Article, review, commentary, editorial, etc. (scientific journal)
Honours, Awards and Prizes 【 display / non-display 】
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学会賞(奨励賞)
2009.08 農業農村工学会
藤川 智紀
Award type:Award from Japanese society, conference, symposium, etc. Country:Japan
Past of Cooperative Research 【 display / non-display 】
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食品残渣の液体肥料化に関する研究
2015.04 - 2016.03
(株)セブン-イレブン・ジャパン(東北大へも委託あり。三者契約) 国内共同研究 Cooperative Research within Japan
藤川智紀
Authorship:Principal investigator
Presentations 【 display / non-display 】
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三宅島における噴火後の農業復興について
佐藤岳彦, 藤川智紀, 中村貴彦
第64回農業農村工学会関東支部大会講演会 2013.10 農業農村工学会関東支部
Event date: 2013.10
Language:Japanese Presentation type:Oral presentation (general)
Venue:栃木県宇都宮市
三宅島では2005年に避難指示が解除され避難していた島民の帰島が始まった。しかし,2010年の人口は2,700名弱であり,噴火前1995年と比べても30%減少している。農業生産についても噴火前より大幅に減少しており,耕作放棄地が増加するのに伴い農地面積は減少している。同じ伊豆諸島の大島や八丈島の例を参考に,耕作放棄地の利用による農家一戸あたりの経営面積の増大や新規農作物の導入などが三宅島農業復興の鍵になると考えられる。
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都市部の保育園における幼児の農業体験
板谷夏澄, 藤川智紀, 中村貴彦
第64回農業農村工学会関東支部大会講演会 2013.10 農業農村工学会関東支部
Event date: 2013.10
Language:Japanese Presentation type:Oral presentation (general)
Venue:栃木県宇都宮市
周囲に農地が少ない都市部においては幼児に農作業の体験をさせることが食や農への興味・関心を呼ぶ上で効果的である。世田谷区の認証保育園を対象としたアンケートの結果からは90%以上の保育園で農作業体験が実施されており,その内容は播種から収穫まで様々であり,また年齢によっても異なることが確認された。園外で知り合いの農園や市民農園を使用する場合も多く,都市の農地の利用法として認識する必要があることが示唆された。
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環境保全のための適正な消化液の液肥利用技術
中村真人, 柚山義人, 山岡賢, 折立文子, 藤川智紀
平成24年度農業農村工学会資源循環研究部会講演会・研究発表会 2012.11 農業農村工学会資源循環研究部会
Event date: 2012.11
Language:Japanese Presentation type:Oral presentation (general)
Venue:東京都港区新橋
メタン発酵消化液の液肥利用に関する試験結果及び文献情報を基に消化液含有成分の施用後の動態の特徴を整理した。その結果、消化液は化学肥料と比較してアンモニア揮散が多く、その点を考慮した施肥設計が重要であることが示された。揮散料を考慮した適正な施肥設計ができれば、化学肥料と比較して地下水汚染や温室効果ガスの排出等の環境負荷は増大しないことが示された。
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Estimation of damages by tsunami and suggestion of reconstruction of farmlands in Soma city, Fukushima Prefecture after the Tohoku-Kanto Earthquake
Komamura Masaharu, Fujikawa Tomonori, Nakamura Takahiko
2012.09
Event date: 2012.09
Language:Japanese Presentation type:Oral presentation (general)
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有機物含有量の高い土壌を細骨材に用いたモルタルの力学的特性
兵頭正浩, 横井克則, 藤川智紀, 佐藤周之
コンクリート工学年次大会2012 2012.07 日本コンクリート工学会
Event date: 2012.07
Language:Japanese Presentation type:Oral presentation (general)
Venue:広島県広島市
有機物含有量の高い土壌を細骨材代替材として用いたモルタルの力学特性を調べた。その結果、細骨材に用いた標準佐野質量に対して内割で10%の有機質土壌と置換した場合は標準今日したいと同様の強度特性を示すのに対し、土壌の置換量を増加させると強度発言が遅れることが明らかになった。一方、経時的な強度増進は長く続いた。
Social Activities 【 display / non-display 】
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令和元年度東京フォーラム(農村振興研究会)
Role(s): Panelist, Lecturer
全国農村振興技術連盟 2019.01
Basic stance of industry-university cooperation 【 display / non-display 】
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農地を対象とした研究だけでなく,これまでの知見を応用できる分野には積極的に取り組んでいきたい。
Attractiveness of Research 【 display / non-display 】
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ある問題に対して,徹底的に原因を分析し,確かな解決策を見出す能力を身に付けて欲しいと思います。氾濫する情報の中で確かなものを掴むには,基礎学力と理論的な思考力が必要です。全力をあげてサポートしたいと思います。