1) アフリカ半乾燥地における農地林（アグロフォレスト）の形成要因と機能の解明
キーワード：アグロフォレストリ―，景観，生業，樹木利用，採集, マルーラ, 植生
2017.04～2020.03.
| 藤岡 悠一郎（ふじおか ゆういちろう） | データ更新日：2021.08.14 |
主な研究テーマ
2) アフリカ農牧社会における生業変容
キーワード：農耕，牧畜，複合生業，食料主権, 食文化
2018.04～2021.03.
キーワード：農耕，牧畜，複合生業，食料主権, 食文化
2018.04～2021.03.
3) 社会経済変化と昆虫食の変容
キーワード：昆虫食, 半乾燥地, 採集, 食文化
2018.06～2018.06.
キーワード：昆虫食, 半乾燥地, 採集, 食文化
2018.06～2018.06.
4) 温暖化による永久凍土の融解と人間社会への影響
キーワード：永久凍土，北極域，環境変化，牧畜民
2015.04～2021.03.
キーワード：永久凍土，北極域，環境変化，牧畜民
2015.04～2021.03.
5) トチノキ巨木林の形成要因と機能
キーワード：巨樹，里山，景観，樹木利用，山村
2017.04～2020.03.
キーワード：巨樹，里山，景観，樹木利用，山村
2017.04～2020.03.
6) 先史日本列島におけるフロンティア社会の成立要因と動態メカニズム
キーワード：フロンティア社会,生業,文化,先史時代
2019.04～2021.03.
キーワード：フロンティア社会,生業,文化,先史時代
2019.04～2021.03.
7) 日本列島における採集林の成立要因と変遷に関する地理学的研究
キーワード：採集林，二次林，採集活動，資源利用，島嶼部
2020.04～2023.03.
キーワード：採集林，二次林，採集活動，資源利用，島嶼部
2020.04～2023.03.
従事しているプロジェクト研究
日本列島における採集林の成立要因と変遷に関する地理学的研究
2020.04～2024.03, 代表者：藤岡悠一郎, 九州大学.
2020.04～2024.03, 代表者：藤岡悠一郎, 九州大学.
HYdrology, PErmafrost and resilience in Eastern Russian Arctic and Subarctic (HYPE-ERAS)
2020.04～2023.03, 代表者：檜山哲哉, 名古屋大学.
2020.04～2023.03, 代表者：檜山哲哉, 名古屋大学.
北極域研究推進プロジェクト（ArCS-2）
2020.04～2025.03, 代表者：高倉浩樹, 東北大学, 国立極地研究所、海洋研究開発機構、北海道大学
北極域研究推進プロジェクト（ArCS: Arctic Challenge for Sustainability）は、文部科学省の補助事業として、国立極地研究所、海洋研究開発機構及び北海道大学の3機関が中心となって、2015年9月から2020年3月までの約4年半にわたって実施する、我が国の北極域研究のナショナルフラッグシッププロジェクトです。.
2020.04～2025.03, 代表者：高倉浩樹, 東北大学, 国立極地研究所、海洋研究開発機構、北海道大学
北極域研究推進プロジェクト（ArCS: Arctic Challenge for Sustainability）は、文部科学省の補助事業として、国立極地研究所、海洋研究開発機構及び北海道大学の3機関が中心となって、2015年9月から2020年3月までの約4年半にわたって実施する、我が国の北極域研究のナショナルフラッグシッププロジェクトです。.
民族誌データと数理モデルの融合による社会構造変動理論の構築：格差に着目して
2019.09～2022.03, 代表者：瀧川裕貴 , 東北大学.
2019.09～2022.03, 代表者：瀧川裕貴 , 東北大学.
トチノキ巨木林の分布と成立要因に関する地理学的研究：文化景観としての評価に向けて
2018.09～2021.08, 代表者：藤岡悠一郎, 九州大学.
2018.09～2021.08, 代表者：藤岡悠一郎, 九州大学.
北東アジア地域研究推進事業
2017.04～2020.03, 代表者：高倉浩樹, 東北大学, 大学共同利用機関法人人間文化研究機構.
2017.04～2020.03, 代表者：高倉浩樹, 東北大学, 大学共同利用機関法人人間文化研究機構.
アフリカ農業・農村社会史の再構築：在来農業革命の視点から
2016.04～2020.03, 代表者：鶴田格, 近畿大学, 近畿大学，東京外国語大学.
2016.04～2020.03, 代表者：鶴田格, 近畿大学, 近畿大学，東京外国語大学.
アフリカ食文化研究の新展開：食料主権論のために
2018.04～2021.03, 代表者：藤本 武, 富山大学, 富山大学.
2018.04～2021.03, 代表者：藤本 武, 富山大学, 富山大学.
先史日本列島におけるフロンティア社会の成立要因と動態メカニズム
2019.07～2021.03, 代表者：藤岡悠一郎, 九州大学.
2019.07～2021.03, 代表者：藤岡悠一郎, 九州大学.
研究業績
主要著書
| 1. | Yuichiro Fujioka, Yudai Ishimoto, Tadasu Tsuruta, Rethinking African Agriculture: How Non-Agrarian Factors Shape Peasant Livelihoods, Routledge, "Unique Features of African Agro-pastoralism: Adapting Life and Sharing Wealth in Fluid Environment.", pp.79-94, 2020.08, [URL]. |
| 2. | Hiroki Takakura, Yuichiro Fujioka, et al., Permafrost and Culture: Global Warming and Sakha Republic (Yakutia), Russian Federation (CNEAS Report Book 26) (English Edition)., Center for Northeast Asian Studies, Tohoku University, 2021.05, [URL]. |
| 3. | 古川柳蔵、生田博子、藤岡悠一郎、庄子元、島田和久、三橋正枝、高野孝子、岩本渉, 在来知と社会的レジリエンスーサステナビリティに活かす温故知新, 筑波書房, 「第3章 社会的レジリエンスとしての物々交換―ナミビア農牧社会における気象災害時の食糧獲得」、pp.41-61, 2021.07, [URL]. |
| 4. | 藤岡悠一郎,高倉浩樹,田中利和,ステパン グリゴリエフ, 『北極の人間と社会』（分担：第5章 変化と適応）, 北海道大学出版会, pp.123-149, 2020.02. |
| 5. | 藤岡悠一郎, 『アフリカ昆虫学―生物多様性とエスノサイエンス』（分担：4章 ナミビア農牧社会における昆虫食をめぐるエスノサイエンス）, 海游舎, pp.52-69, 2019.03. |
| 6. | 藤岡悠一郎, 『アフリカ昆虫学―生物多様性とエスノサイエンス』（分担：2章 アフリカ昆虫学とエスノサイエンス）, 海游舎, pp.21-33, 2019.03. |
| 7. | 水野一晴, 藤岡悠一郎, 『朽木谷の自然と社会の変容』（分担：おわりに）, 海青社, 2019.03. |
| 8. | 藤岡悠一郎, 『朽木谷の自然と社会の変容』（分担：第19 章 朝市と地域資源の活用）, 海青社, 2019.03. |
| 9. | 山科千里・藤岡悠一郎, 『朽木谷の自然と社会の変容』（分担：第17 章 獣害問題の深刻化）, 海青社, pp.233-254, 2019.03. |
| 10. | 藤岡悠一郎, 『朽木谷の自然と社会の変容』（分担：第12 章 朽木の生き物と人々の関わり）, 海青社, 2019.03. |
| 11. | 藤岡悠一郎, 『朽木谷の自然と社会の変容』（分担：第9 章 山林資源の利用3―山の幸としての植物）, 海青社, pp.111-125, 2019.03. |
| 12. | 藤岡悠一郎, 『朽木谷の自然と社会の変容』（分担：第6 章 ヤマとタンボを結ぶホトラ―刈敷と里山利用の変遷）, 海青社, pp.73-85, 2019.03. |
| 13. | 水野一晴, 藤岡悠一郎, 朽木谷の自然と社会の変容, 海青社, 2019.03. |
| 14. | 島田周平・上田 元編, 『世界地誌シリーズ８ アフリカ』（分担：4.3 乾燥地域における牧畜，昆虫食，マルーラ酒）, 朝倉書店, pp.70-78, 2017.08. |
| 15. | 藤岡 悠一郎, 『サバンナ農地林の社会生態誌――ナミビア農村にみる社会変容と資源利用』（単著）, 昭和堂, 2016.03, [URL]. |
| 16. | 藤岡 悠一郎, 「ナミビアの首都ウイントフックの変遷と脱南アフリカの課題」阿部和俊編『都市の景観地理―アジア・アフリカ編』（pp.51-57）, 古今書院, 2017.03, [URL]. |
| 17. | 藤岡 悠一郎, 「マルーラ酒が守るサバンナの農地林」重田眞義・伊谷樹一編『アフリカ潜在力 4 争わないための生業実践――生態資源と人びとの関わり』（pp.245-263）, 2016.04, [URL]. |
| 18. | 藤岡 悠一郎, 「気候変動とアフリカの農業――ナミビア農牧民の食料確保に注目して」石川博樹・小松かおり・藤本武編『食と農のアフリカ史――現代の基層に迫る』（pp.255-271）, 昭和堂, 2016.03, [URL]. |
| 19. | 藤岡 悠一郎, 「ナミビア基礎情報――数字で見るナミビア」水野一晴・永原陽子編『ナミビアを知るための53章』, 明石書店, pp.20-23, 2016.03, [URL]. |
| 20. | 藤岡 悠一郎, 飯嶋盛雄, 鈴木哲司, 「水浸しのサバンナ――北部の網状流地帯とエトーシャ・パン」水野一晴・永原陽子編『ナミビアを知るための53章』, 明石書店, pp.68-72, 2016.03, [URL]. |
| 21. | 藤岡 悠一郎, 「バントゥ系の人々の到来――オバンボ諸王国の発達」水野一晴・永原陽子編『ナミビアを知るための53章』, 明石書店, pp.119-123, 2016.03, [URL]. |
| 22. | 藤岡 悠一郎, 高田明, 「国家と伝統的権威――現代に息づく「伝統」」水野一晴・永原陽子編『ナミビアを知るための53章』, 明石書店, pp.156-159, 2016.03, [URL]. |
| 23. | 藤岡 悠一郎, 「首都ウィンドフックの変遷――発達する都市」水野一晴・永原陽子編『ナミビアを知るための53章』, pp.160-165, 2016.03, [URL]. |
| 24. | 藤岡 悠一郎, 「（コラム）ウラン」水野一晴・永原陽子編『ナミビアを知るための53章』, 明石書店, pp.179-181, 2016.03, [URL]. |
| 25. | 藤岡 悠一郎, 手代木功基, 「食肉産業の展開――商業畜産と生業牧畜の区分を超えて」水野一晴・永原陽子編『ナミビアを知るための53章』, 明石書店, pp.182-187, 2016.03, [URL]. |
| 26. | 藤岡 悠一郎, 「マルーラ酒が取り持つ社会関係――オバンボの暮らし」水野一晴・永原陽子編『ナミビアを知るための53章』, 明石書店, pp.264-268, 2016.03, [URL]. |
| 27. | 永原陽子, 藤岡 悠一郎, 「土地改革――大規模商業農場とコミュナルランド」水野一晴・永原陽子編『ナミビアを知るための53章』, 明石書店, pp.269-271, 2016.03, [URL]. |
| 28. | 藤岡 悠一郎, 「鉱業の変遷――ダイヤモンドからウランへ」水野一晴・永原陽子編『ナミビアを知るための53章』, 明石書店, pp.174-178, 2016.03, [URL]. |
| 29. | 藤岡 悠一郎, 「（コラム）昆虫食」水野一晴・永原陽子編『ナミビアを知るための53章』, 明石書店, pp.269-271, 2016.03, [URL]. |
| 30. | 藤岡 悠一郎, 「農地林の利用と更新をめぐる農牧民の生計戦略―ナミビア農村のポリティカル・エコロジー」横山智編『資源と生業の地理学 （ネイチャー・アンド・ソサエティ研究第4巻）』, 海青社, pp.165-186, 2013.11, [URL]. |
| 31. | 藤岡 悠一郎, 「地理学」東長靖・石坂晋哉編『持続型生存基盤論ハンドブック（講座生存基盤論第6巻）』, 京都大学学術出版会, pp.18-19, 2012.11, [URL]. |
| 32. | 藤岡 悠一郎, （ナミビア関連項目）加藤博・島田周平編『世界地名大辞典第3巻 中東・アフリカ』, 朝倉書店, 2012.11, [URL]. |
| 33. | 藤岡 悠一郎, 宮本真二, 「ナミビア」環境総合年表編集委員会編『環境総合年表―日本と世界―』, すいれん舎, pp.500-501, 2011.09, [URL]. |
| 34. | 藤岡 悠一郎, 「変容するサバンナ地帯の降雨依存農業」篠田雅人・門村 浩・山下博樹編『乾燥地科学シリーズ４ 乾燥地の資源とその利用・保全』, 古今書院, pp.85-104, 2010.09, [URL]. |
| 35. | 藤岡 悠一郎, 「エグンボ、迷路状コンパウンド」布野修司編『世界住居誌』, 昭和堂, pp.280-281, 2005.03, [URL]. |
| 36. | 藤岡 悠一郎, 「ナミビア北部における『ヤシ植生』の形成とオヴァンボの樹木利用の変容」水野一晴編『アフリカ自然学』, 古今書院, pp.216-225, 2005.02, [URL]. |
主要原著論文
| 1. | Hiroki Takakura, Yuichiro Fujioka*, Vanda Ignatyeva, Toshikazu Tanaka, Nadezhda Vinokurova, Stepan Grigorev, Sardana Boyakova, Differences in local perceptions about climate and environmental changes among residents in a small community in eastern Siberia, Polar Science, https://doi.org/10.1016/j.polar.2020.100556, 27, 100556, 2021.08, [URL]. |
| 2. | 藤岡悠一郎, 大石侑香, 田中利和, ヴィノクロヴァ, ナヂェージュダ, サハ共和国・ゴルヌィ地方におけるサハの野生ベリー類採集, 北海道立北方民族博物館研究紀要, （受理）, 2020.03. |
| 3. | Yoshinori Watanabe, Fisseha Itanna, Yasuhiro Izumi, Simon K. Awala, Yuichiro Fujioka, Kenta Tsuchiya, Morio Iijima, Cattle manure and intercropping effects on soil properties and growth and yield of pearl millet and cowpea in Namibia, Journal of Crop Improvement, doi.org/10.1080/15427528.2019.1604456, 33, 3, 395-409, 2019.04, [URL]. |
| 4. | Yuichiro Fujioka,Yoshinori Watanabe,Hiroki Mizuochi,Fisseha Itanna,Shou Ruben,Morio Iijima, Classification of Small Seasonal Ponds Based on Soil–Water Environments in the Cuvelai Seasonal Wetland System, North-Central Namibia, Wetlands, 10.1007/s13157-018-1073-y, 38, (5), 1045-1057, 2018.11, [URL], The objectives of this study were to classify the small seasonal ponds that develop in the Cuvelai Seasonal Wetland System in north-central Namibia based on soil physicochemical properties so that potential agricultural uses of the ponds could be assessed. Satellite imagery was used to examine the relationships between soil characteristics and the probability of water presence in the region. Soil samples were collected from 66 ponds at three sites and their physicochemical properties and levels of salt accumulation were investigated. Soil data were analyzed by using principal component analysis and cluster analysis. The ponds were classified into four types based on soil properties. Type A accounted for 20% of the ponds and was characterized by high levels of clay, silt, total N, and exchangeable Ca, Mg, and K. Type B accounted for 14% of the ponds and was characterized by high values of organic C, C/N ratios, and available P. Type C accounted for 20% of the ponds, and this type featured high levels of salinity and sodicity. The remaining ponds were classified as Type D. If these seasonal ponds are to be considered for crop production, Type C should be avoided and Type D would require soil fertility improvements.. |
| 5. | Hiroki Mizuochi, Tetsuya Hiyama, Takeshi Ohta, Yuichiro Fujioka, Jack R. Kambatuku, Morio Iijima, Kenlo N. Nasahara, Development and evaluation of a lookup-table-based approach to data fusion for seasonal wetlands monitoring An integrated use of AMSR series, MODIS, and Landsat, Remote Sensing of Environment, 10.1016/j.rse.2017.07.026, 199, 370-388, 2017.09, [URL], Broad scale monitoring of inland waters is essential to research on carbon and water cycles, and for application in the monitoring of disasters including floods and droughts on various spatial and temporal scales. Satellite remote sensing using spatiotemporal data fusion (STF) has recently attracted attention as a way of simultaneously describing spatial heterogeneity and tracking the temporal variability of inland waters. However, existing STF approaches have limitations in describing abrupt temporal changes, integrating “dissimilar” datasets (i.e., fusions between microwave and optical data), and compiling long-term, frequent STF datasets. To overcome these limitations, in this study we developed and evaluated a lookup table (LUT)-based STF, termed database unmixing (DBUX), using multiple types of satellite data (AMSR series, MODIS, and Landsat), and applied it to semi-arid seasonal wetlands in Namibia. The results show that DBUX is: 1) flexible in integrating optical data (MODIS or Landsat) with microwave (AMSR series) and seasonal (day of year) information; 2) able to generate long-term, frequent Landsat-like datasets; and 3) more reliable than an existing approach (spatial and temporal adaptive reflectance fusion model; STARFM) for tracking dynamic temporal variations in seasonal wetlands. Water maps retrieved from the resulting STF dataset for the wetlands had a 30-m spatial resolution and a temporal frequency of 1 or 2 days, and the dataset covered from 2002 to 2015. The time series water maps accurately described both seasonal and interannual changes in the wetlands, and could act as a basis for understanding the hydrological features of the region. Further studies are required to enable application of DBUX in other regions, and for other landscapes with different satellite sensor combinations.. |
| 6. | Tetsuya Hiyama, Hironari Kanamori, Jack Kambatuku, Ayumi Kotani, Kazuyoshi Asai, Hiroki Mizuochi, Yuichiro Fujioka, Morio Iijima, Analysing the origin of rain- and subsurface water in seasonal wetlands of north-central Namibia, Environmental Research Letters, 10.1088/1748-9326/aa5bc8, 12, 034012, 2017.03, [URL], We investigated the origins of rain- and subsurface waters of north-central Namibia's seasonal wetlands, which are critical to the region's water and food security. The region includes the southern part of the Cuvelai system seasonal wetlands (CSSWs) of the Cuvelai Basin, a transboundary river basin covering southern Angola and northern Namibia. We analysed stable water isotopes (SWIs) of hydrogen (HDO) and oxygen (H2 18O) in rainwater, surface water and shallow groundwater. Rainwater samples were collected during every rainfall event of the rainy season from October 2013 to April 2014. The isotopic ratios of HDO (δD) and oxygen H2 18O (δ 18O) were analysed in each rainwater sample and then used to derive the annual mean value of (δD, δ 18O) in precipitation weighted by each rainfall volume. Using delta diagrams (plotting δD vs. δ 18O), we showed that the annual mean value was a good indicator for determining the origins of subsurface waters in the CSSWs. To confirm the origins of rainwater and to explain the variations in isotopic ratios, we conducted atmospheric water budget analysis using Tropical Rainfall Measuring Mission (TRMM) multi-satellite precipitation analysis (TMPA) data and ERA-Interim atmospheric reanalysis data. The results showed that around three-fourths of rainwater was derived from recycled water at local–regional scales. Satellite-observed outgoing longwave radiation (OLR) and complementary satellite data from MODerate-resolution Imaging Spectroradiometer (MODIS) and Advanced Microwave Scanning Radiometer (AMSR) series implied that the isotopic ratios in rainwater were affected by evaporation of raindrops falling from convective clouds. Consequently, integrated SWI analysis of rain-, surface and subsurface waters, together with the atmospheric water budget analysis, revealed that shallow groundwater of small wetlands in this region was very likely to be recharged from surface waters originating from local rainfall, which was temporarily pooled in small wetlands. This was also supported by tritium (3H) counting of the current rain- and subsurface waters in the region. We highly recommend that shallow groundwater not be pumped intensively to conserve surface and subsurface waters, both of which are important water resources in the region.. |
| 7. | Koki Teshirogi, Chisato Yamashina, Yuichiro Fujioka, Variations in mopane vegetation and its use by local people: Comparison of four sites in northern Namibia, African Study Monographs, 10.14989/218898, 38, 1, 5-25, 2017.03, [URL]. |
| 8. | Yoshinori Watanabe, Fisseha Itanna, Yuichiro Fujioka, Shou Ruben, Morio Iijima, Soil fertility status of seasonally closed wetland ecosystem (ondombe) in north-central Namibia, African Journal of Agricultural Research, 10.5897/AJAR2017.12235, 12, 18, 1538-1546, 2017.02, In the Cuvelai Seasonal Wetland System (CSWS) of North-central Namibia, there are widespread manifestations of seasonally flooded river and seasonally closed wetland ecosystems (ponds). These wetlands are called oshana (seasonally flooded river wetland) and ondombe (seasonally closed wetland) according to the local language. This study was initiated to find out the soil fertility status of ondombes and whether they could be utilized for agricultural purposes unlike the present situation. Soil salinity and sodicity were determined to find out impact of such adverse conditions on possibility of food production. A total of 70 representative ondombes were identified from three selected villages. A total of 210 soil samples were collected from upper, middle and lower positions adjacent to ondombes, and 15 soil samples from each 5 upland fields in the three villages and 102 soil samples from different spots of the flood plain in the three oshanas for comparison. The results indicated that the mean soil pH (H2O) in ondombe was 6.3, the means of organic C and total N were 6.28 and 0.41 g kg-1; respectively, the mean of available P was 4.81 mg P kg-1. The means of exchangeable Ca, Mg, K, and Na in ondombe were 2.31, 1.44, 0.21, and 0.61 cmolc kg-1, respectively. Most soil nutrients were higher in lower ondombe positions than on upper and middle positions. Organic C, exchangeable Mg, and clay at the ondombe soils were significantly higher than those at the croplands. The means of electrical conductivity of saturation extract (ECe) and sodium adsorption ratio (SAR) in ondombe soils were 0.62 ds m-1 and 7.32, respectively; even though most of the ondombe soils did not exhibit salinity and sodicity problems. Hence, one can conclude that an ondombe soil has an appropriate condition for agriculture, and may only be prone to sodicity whenever the sodium content is high, as sometimes observed.. |
| 9. | Yoshinori Watanabe, Fisseha Itanna, Yuichiro Fujioka, Ausiku Petrus, Morio Iijima, Characteristics of soils under seasonally flooded wetlands (oshanas) in north-central Namibia, African Journal of Agricultural Research, 10.5897/AJAR2016.11758, 11, 46, 4786-4795, 2016.09, [URL], Lowland wetlands generally have a high agricultural production potential and can be local hot-spots for biodiversity. Specific seasonal wetland system is largely distributed in north-central Namibia. Seasonal wetlands consist of seasonal river wetlands (locally known as oshanas). However, studies on soil fertility, salinity and sodicity in seasonal river wetlands are still limited in this area. The objective of this study was hence to investigate the soil fertility status of seasonal wetlands and evaluate their potential for agricultural production and consider sustainability of the land use system. Soil samples were collected from 102 different spots of the flood plain within 3 major seasonal rivers, and analyzed for their physico-chemical properties and salinity and sodicity. The findings for average soil organic carbon (1.94 g kg-1) and average clay contents (102.3 g kg-1) of seasonal rivers were drastically lower than the wetland of semi-arid Africa regions (organic carbon, 5.8 g kg-1; clay contents, 340 g kg-1), and organic carbon and clay content significantly (p<0.05) decreased at the lower part of each seasonal river. Most of the seasonal river soil’s’ electrical conductivity of saturated paste extract (ECe) and the sodium adsorption ratio of the saturated paste extract (SAR) were more than 4 dS m-1 and 13, respectively. However, there were large differences in electrical conductivity of saturated paste extract (ECe) and the sodium adsorption ratio of the saturated paste extract (SAR) values among the sampling spots. These findings suggest the high agricultural importance to improve the soil organic matter and clay contents, and land selection to avoid the strongly high saline-sodic soil sites in seasonal river. . |
| 10. | Yoshiaki Nishikawa, Ottilie Shivolo, Martin Angula, Benisiu Thomas, Martha Hangula, Tula Maharero, Yuichiro Fujioka, Village monograph of an agro-pastoral society in north-central Namibia, Journal of Ryukoku Economics, 56, 1, 13-29, 2016.09. |
| 11. | Simon K. Awala, Koji Yamane, Yasuhiro Izumi, Yuichiro Fujioka, Yoshinori Watanabe, Kaede C. Wada, Yoshimasa Kawato, Osmund D. Mwandemele, Morio Iijima, Field evaluation of mixed-seedlings with rice to alleviate flood stress for semi-arid cereals, European Journal of Agronomy, 10.1016/j.eja.2016.07.003, 80, 105-112, 2016.07, [URL], Flash floods, erratically striking semi-arid regions, often cause field flooding and soil anoxia, resulting in crop losses on food staples, typically pearl millet (Pennisetum glaucum L.) and sorghum (Sorghum bicolor (L.) Moench). Recent glasshouse studies have indicated that rice (Oryza spp.) can enhance flood stress tolerance of co-growing dryland cereals by modifying their rhizosphere microenvironments via the oxygen released from its roots into the aqueous rhizosphere. We tested whether this phenomenon would be expressed under field flood conditions. The effects of mix-planting of pearl millet and sorghum with rice on their survival, growth and grain yields were evaluated under controlled field flooding in semi-arid Namibia during 2014/2015–2015/2016. Single-stand and mixed plant treatments were subjected to 11–22 day flood stress at the vegetative growth stage. Mixed planting increased plant survival rates in both pearl millet and sorghum. Grain yields of pearl millet and sorghum were reduced by flooding, in both the single-stand and mixed plant treatments, relative to the non-flooded upland yields, but the reduction was lower in the mixed plant treatments. In contrast, flooding increased rice yields. Both pearl millet–rice and sorghum–rice mixtures demonstrated higher land equivalent ratios, indicating a mixed planting advantage under flood conditions. These results indicate that mix-planting pearl millet and sorghum with rice could alleviate flood stress on dryland cereals. The results also suggest that with this cropping technique, rice could compensate for the dryland cereal yield losses due to field flooding.. |
| 12. | Morio Iijima, Simon K. Awala, Yoshinori Watanabe, Yoshimasa Kawato, Yuichiro Fujioka, Koji Yamane, Kaede C. Wada, Mixed cropping has the potential to enhance flood tolerance of drought-adapted grain crops, Journal of Plant Physiology, 10.1016/j.jplph.2016.01.004, 192, 21-25, 2016.01, [URL], Recently, the occurrences of extreme flooding and drought, often in the same areas, have increased due to climate change. Wetland plant species are known to oxygenate their rhizospheres by releasing oxygen (O2) from their roots. We tested the hypothesis that wetland species could help upland species under flood conditions; that is, O2 released from the wetland crop roots would ameliorate rhizosphere O2-deficient stress and hence facilitate upland crop root function. Flooding tolerance of upland-adapted staple crops—pearl millet (Pennisetum glaucum) and sorghum (Sorghum bicolor) mix-cropped with rice (Oryza spp.) was investigated in glasshouse and laboratory. We found a phenomenon that strengthens the flood tolerance of upland crops when two species—one wetland and one drought tolerant—were grown using the mixed cropping technique that results in close tangling of their root systems. This technique improved the photosynthetic and transpiration rates of upland crops subjected to flood stress (O2-deficient nutrient culture). Shoot relative growth rates during the flooding period (24 days) tended to be higher under mixed cropping compared with single cropping. Radial oxygen loss from the wetland crop roots might be contributed to the phenomenon observed. Mixed cropping of wet and dryland crops is a new concept that has the potential to overcome flood stress under variable environmental conditions.. |
| 13. | 水落裕樹,檜山哲哉,金森大成,太田岳史,藤岡悠一郎,飯嶋盛雄,奈佐原顕郎, 長期衛星観測データとＵＡＶ地形測量を組み合わせた半乾燥地の季節湿地における貯水量モニタリング, 日本リモートセンシング学会, 36, 2, 81-92, 2016.06. |
| 14. | 手代木功基,藤岡悠一郎,飯田義彦, トチノミ加工食品販売の地域的特徴―道の駅販売所に着目して, 季刊地理学, 68, 2, 100-114, 2016.06. |
| 15. | Yuichiro Fujioka, Rural entrepreneurs and social connections: The management of cattle posts and interactions among farmers in north-central Namibia, MILA Special Issue on Exploring African Potentials: The Dynamics of Action, Living Strategy and Social Order in Southern Africa, 12, 25-38, 2014.03, [URL]. |
| 16. | 八塚春名,藤岡悠一郎, 山村の特産品づくりを支える資源利用ネットワーク―滋賀県高島市朽木におけるトチ餅生産とトチノミ利用―, ビオストーリー, 24, 94-106, 2015.09. |
| 17. | 藤岡悠一郎,八塚春名,飯田義彦, 滋賀県高島市朽木地域におけるトチモチの商品化, 人文地理, 67, 4, 40-55, 2015.08. |
| 18. | 手代木功基,藤岡悠一郎,飯田義彦, 滋賀県高島市朽木地域におけるトチノキ巨木林の立地環境, 地理学評論, 88, 5, 431-450, 2015.03. |
| 19. | Yuichiro Fujioka, Vegetation changes and use of palms as a building material by Ovambo agro-pastoralists in North-Central Namibia., African Study Monographs, Supplementary Issue, 10.14989/68458, 30, 89-105, 2005.03, [URL]. |
| 20. | Yuichiro Fujioka, Changes in natural resource use among Owambo agro-pastoralists of north-central Namibia resulting from the enclosure of local frontiers, African Study Monographs Supplementary Issue, 10.14989/96292, 40, 129-154, 2010.03, [URL]. |
主要総説, 論評, 解説, 書評, 報告書等
主要学会発表等
学会活動
学会大会・会議・シンポジウム等における役割
2020.09.27～2020.09.30, 日本地理学会秋季学術大会, 大会実行委員.
2016.09.30～2016.10.02, 日本地理学会秋季学術大会, 大会実行委員.
学術論文等の審査
| 年度 | 外国語雑誌査読論文数 | 日本語雑誌査読論文数 | 国際会議録査読論文数 | 国内会議録査読論文数 | 合計 |
|---|---|---|---|---|---|
| 2021年度 | 1 | 1 | 2 | ||
| 2020年度 | 1 | 1 | 2 | ||
| 2019年度 | 1 | 1 | |||
| 2017年度 | 1 | 1 |
その他の研究活動
海外渡航状況, 海外での教育研究歴
Harpa Concert Hall, Iceland, 2019.10～2019.10.
ロシア科学アカデミー人文学北方先住民問題研究所, Russia, 2019.08～2019.09.
国立台湾大学, 中央研究院, Taiwan, 2019.03～2019.03.
カンボジアシェムリアップ, Cambodia, 2019.03～2019.03.
南アフリカファラボルワ近郊農村, SouthAfrica, 2019.03～2019.03.
Harpa Concert Hall, Iceland, 2018.10～2018.10.
ロシア科学アカデミー人文学北方先住民問題研究所, Russia, 2018.08～2018.08.
ロシア科学アカデミー人文学北方先住民問題研究所, Russia, 2018.03～2018.03.
受賞
平成30年度論文奨励賞, 日本リモートセンシング学会, 2018.04.
研究資金
科学研究費補助金の採択状況(文部科学省、日本学術振興会)
2020年度～2023年度, 基盤研究(B), 代表, 日本列島における採集林の成立要因と変遷に関する地理学的研究.
2019年度～2021年度, 挑戦的研究（萌芽）, 分担, 民族誌データと数理モデルの融合による社会構造変動理論の構築：格差に着目して.
2018年度～2021年度, 基盤研究(B), 分担, アフリカ食文化研究の新展開：食料主権論のために.
2017年度～2019年度, 若手研究(B), 代表, アフリカ半乾燥地域における農地林の形成過程と機能の解明.
2015年度～2016年度, 研究活動スタート支援, 代表, アフリカ農牧社会における複合生業論の再構築.
日本学術振興会への採択状況(科学研究費補助金以外)
2009年度～2012年度, 特別研究員, 代表, 西南部アフリカ半乾燥地域における気候変動とモパネ植生の動態、地域社会の脆弱性.
2006年度～2008年度, 特別研究員, 代表, ナミビア北部に居住するオヴァンボ農牧民の生業変容と地域動態に関する研究.
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