植物根成孔隙マクロポアを活用した有機物蓄積と温室効果ガスの排出削減

2022 Fiscal Year Annual Research Report

• Project/Area Number: 21H04747
• Research Institution: Okayama University
• Principal Investigator: 森 也寸志 岡山大学, 環境生命自然科学学域, 教授 (80252899)
• Co-Investigator(Kenkyū-buntansha): 松本 真悟 島根大学, 学術研究院農生命科学系, 教授 (00346371) ; 前田 守弘 岡山大学, 環境生命科学学域, 教授 (00355546) ; 金子 信博 福島大学, 食農学類, 教授 (30183271) ; 宗村 広昭 岡山大学, 環境生命科学学域, 准教授 (90403443)
• Project Period (FY): 2021-04-05 – 2025-03-31
• Keywords: マクロポア / 土壌有機物 / メタン / 二酸化炭素 / 下方浸透

Outline of Annual Research Achievements

陸域の有機物の保全の傾向について明らかになり，特に土壌が有機質化するときの初期の団粒の形成過程について明らかになった．簡単な乾湿の繰り返しで団粒は形成されたが，有機物の存在が必要であることがわかった．また，下方浸透の促進が土壌の有機質化だけでなく植物生長にも有効であることが明らかになった．アジア、特に南アジアの研究結果をまとめると不耕起で土壌炭素，特に表層の炭素が増え，有意差はないものの，収量が減少することはなくむしろやや増えることがわかった．水稲栽培においては，夏季の高温により土壌微生物の活性が高まり土壌からのヒ素の溶出が促進され，イネによるヒ素吸収が促進されることが明らかになった．コメのヒ素濃度は登熟期間中の温度と正の相関関係が認められ，気温が高くなるほどコメ中のヒ素濃度も有意に高くなった．しかし，気温に関係なくコメへのヒ素蓄積量は一定であったことから，コメへのヒ素蓄積は高温による登熟期間との関係を明らかにする必要があることを認めた．家畜ふんおよび生ゴミ堆肥を施用した土壌からのGHG排出メカニズムを考察したところ，堆肥の違いだけでなく，土壌特性，含水量，アンモニア態窒素含量がGHG排出に大きく影響することが示された．それらが流出した際，流域レベルでの土壌や有機物の流出挙動を評価するため，河川における定期サンプリングと水質分析を進め，気象条件，土地利用，土壌種類，地形などとの時間的・空間的な関係性解析を進めた．

Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

陸域の有機物の保全の傾向について明らかになり，特に土壌が有機質化するときの初期の団粒の形成過程について明らかになったため，また，下方浸透の促進が土壌の有機質化だけでなく植物生長にも有効であることが明らかになったため．

Strategy for Future Research Activity

メタンガスの発生機構について明らかになってきたところがあるため，カラム実験に注力し，テーマの1つであるメタンガスの発生とその抑制対策について研究を発展させていく．

Research Products

• [Journal Article] Greenhouse gas emissions from agricultural soil amended with kitchen compost of varying ages (2023)
  • Author(s): Chau Tran Thi Minh、Someya Takashi、Akao Satoshi、Nakamura Masato、Oritate Fumiko、Somura Hiroaki、Yamane Shinzo、Maeda Morihiro
  • Journal Title: Soil Science and Plant Nutrition Volume: 69 Pages: 137～147
  • DOI: 10.1080/00380768.2022.2160622
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Artificial macropore installation and no-tillage practice in subtropical sugarcane field to conserve water and organic matter in soils (2022)
  • Author(s): Oka, K., Bui, T. L., Mori, Y., Osawa, K. & Hoshikawa, A.
  • Journal Title: J. Jpn. Soc. Soil Phys.. Volume: 150 Pages: 93-103
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Artificial macropores and water management effects on reduction of greenhouse gas emissions from rice paddy fields (2022)
  • Author(s): Bui Thanh Long、Mori Yasushi、Maeda Morihiro、Somura Hiroaki
  • Journal Title: Environmental Challenges Volume: 9 Pages: 100657～100657
  • DOI: 10.1016/j.envc.2022.100657
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Impact of no‐tillage on soil quality and crop yield in Asia: A meta‐analysis (2022)
  • Author(s): Hashimi Rahmatullah、Kaneko Nobuhiro、Komatsuzaki Masakazu
  • Journal Title: Land Degradation & Development Volume: 34 Pages: 1004～1018
  • DOI: 10.1002/ldr.4512
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] みどり戦略有機25%目標達成への道筋ー土壌を大切にする農業の時代がやってきたー. (2022)
  • Author(s): 金子信博
  • Journal Title: 農林金融 Volume: 30 Pages: 31
• [Journal Article] Factors causing the increase in arsenic concentration in brown rice due to high temperatures during the ripening period and its reduction by applying converted furnace slag (2022)
  • Author(s): Dhar Protima、Kasuga Junko、Koyama Yuta、Fujisaki Keita、Kadowaki Masayuki、Kobayasi Kazuhiro、Matsumoto Shingo
  • Journal Title: Journal of Plant Nutrition Volume: 46 Pages: 2652～2675
  • DOI: 10.1080/01904167.2022.2160746
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Changes over the Years in Soil Chemical Properties Associated with the Cultivation of Ginseng (Panax ginseng Meyer) on Andosol Soil (2022)
  • Author(s): Matsumoto Shingo、Doi Haruno、Kasuga Junko
  • Journal Title: Agriculture Volume: 12 Pages: 1223～1223
  • DOI: 10.3390/agriculture12081223
  • Peer Reviewed / Open Access
• [Journal Article] Nitrous oxide and carbon dioxide emissions from two types of soil amended with manure compost at different ammonium nitrogen rates (2022)
  • Author(s): Liyanage Thanuja Deepani Panangala、Maeda Morihiro、Somura Hiroaki、Mori Makito、Fujiwara Taku
  • Journal Title: Soil Science and Plant Nutrition Volume: 68 Pages: 473～490
  • DOI: 10.1080/00380768.2022.2087198
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Nitrous oxide and carbon dioxide emissions from two soils amended with different manure composts in aerobic incubation tests (2022)
  • Author(s): Liyanage Thanuja Deepani Panangala、Maeda Morihiro、Somura Hiroaki、Thuong Nguyen Thi Thu、Mori Makito、Fujiwara Taku
  • Journal Title: Soil Science and Plant Nutrition Volume: 68 Pages: 491～504
  • DOI: 10.1080/00380768.2022.2095669
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Simulation of rice paddy systems in SWAT: A review of previous applications and proposed SWAT+ rice paddy module (2022)
  • Author(s): Philip W Gassman, Jaehak Jeong, Julien Boulange, Balaji Narasimhan, Tasuku Kato, Hiroaki Somura, Hirozumi Watanabe, Sadao Eguchi, Yuanlai Cui, Atsushi Sakaguchi, Rui Jiang, Min-Kyeong Kim, Jeffrey G Arnold, Wei Ouyang
  • Journal Title: International Journal of Agricultural and Biological Engineering Volume: 15 Pages: 1～24
  • DOI: 10.25165/j.ijabe.20221501.7147
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Initial aggregate formation of masa soil with organic matter application and repeated wet/dry processes (2022)
  • Author(s): Ryoki Ihara, Yasushi Mori,
  • Organizer: Japan Geophysical Union Annual meeting
  • Int'l Joint Research
• [Presentation] Improving red-soil in Thailand by mixing natural latex, (2022)
  • Author(s): Yasushi Mori, Toru Honzane, Hiroaki Somura, Jun Kano, Mamoru Matsushima, Bnaja Junhasavasdikul,
  • Organizer: Japan Geophysical Union Annual meeting
  • Int'l Joint Research
• [Presentation] Methane gas emission from paddy soils affected by water and structural management (2022)
  • Author(s): Yasushi Mori, Mizuki Hasui, Long Thanh Bui,
  • Organizer: Japan Geophysical Union Annual meeting
  • Int'l Joint Research
• [Presentation] Greenhouse Gas Emissions in Agricultural Fields affected by Soil Structure and Water Management (2022)
  • Author(s): Yasushi Mori
  • Organizer: The International Conference on Sustainable Agriculture and Environment (SAE2022, Nong Lam University - Ho Chi Minh City)
  • Int'l Joint Research / Invited
• [Presentation] Revegetation of tin mining land in Belitung Island, Indonesia (2022)
  • Author(s): Hirmas Fuady Putra・Achmad Sjarmidi・Yasushi Mori
  • Organizer: PAWEES2022 International Conference, Fukuoka, Japan
  • Int'l Joint Research
• [Presentation] Linear macropore application to reduce surface runoff from subtropical sugarcane fields (2022)
  • Author(s): Yasushi Mori・Eisei Morioka・Thanh Long Bui・Kazutoshi Osawa・Akira Hoshikawa
  • Organizer: PAWEES2022 International Conference, Fukuoka, Japan
  • Int'l Joint Research
• [Presentation] The application of fine soil particles to control soil erosion in degraded soil areas (2022)
  • Author(s): Thanh Long Bui・Yasushi Mori
  • Organizer: PAWEES2022 International Conference, Fukuoka, Japan
  • Int'l Joint Research
• [Presentation] Soil Water Retention Curve Improvement by Cellulose Nano-Fiber in the Effects of Application Rates, Drying Temperature, Soil, and Water Types (2022)
  • Author(s): An Thuy Ngo・Yasushi Mori
  • Organizer: PAWEES2022 International Conference, Fukuoka, Japan
  • Int'l Joint Research
• [Presentation] Effects of paddy soil management on greenhouse gas emissions (2022)
  • Author(s): Kota Hamaoka・Yasushi Mori
  • Organizer: PAWEES2022 International Conference, Fukuoka, Japan
  • Int'l Joint Research