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Published Papers 【 display / non-display 】

• Analysis of the Geographic and Vegetation Factors Influencing Predation Damage on Sea Turtle Eggs by the Introduction of Japanese Wild Boar (<i> Sus</i><i> scrofa</i><i> leucomystax)</i> on Tokashiki Island, Okinawa, Japan

  Hirai, T; Konoshima, M; Eto, T; Ota, I

  FORMATH ( FORMATH研究学会 )  23 ( 0 ) n/a   2024

  Type of publication: Research paper (scientific journal)

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  <p>Tokashiki Island with convenient access from urban areas and blessed with rich marine resources, attracts numerous tourists seeking recreational activities such as diving and snorkeling. The island heavily relies on a tourism industry centered on marine resources. However, with the escape and rapid increase in the population of Japanese boars, which were initially introduced as livestock, various damages have become evident. Particularly in recent years, a major concern for local tourism industry stakeholders has been the predation of sea turtle eggs by boars because sea turtles are highly popular marine creatures among snorkelers and divers. Identifying the locations of sea turtle egg predation by wild boars and examining the conditions and situations that increase the likelihood of damage are crucial tasks in considering measures to mitigate the impact. Therefore, in this study, we analyze the factors influencing egg predation using a two-variable logistic regression model. The damage site data from on-site surveys conducted during the 2023 nesting season were utilized along with topographical, land-use, and vegetation data. Explanatory variables included in the regression analysis are average slope angle around the damage sites, predominant vegetation around the damage sites, distance to buildings, distance to roads, distance to rivers, and width of the sandy beach. Results from the regression analysis revealed that the predominant vegetation surrounding the damage sites and the width of the sandy beach significantly influence the risk of damage. Despite encountering challenges during the regression analysis, such as utilizing data from a single year’s nesting season, relatively coarse geographical information, and limited explanatory variables, future endeavors should focus on collecting and accumulating more data for a more comprehensive analysis. Nevertheless, this analysis underscores the value of information provided by such studies in establishing spatial priorities for implementing measures to capture wild boars and protect sea turtle eggs in the future.</p>

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• Diameter and stem volume estimation based on under canopy UAV–SfM–MVS survey approach in subtropical forest of Okinawa Ialand, Japan

  Fu Shimabuku, Masashi Konoshima, Ikuo Ota

  FORMATH ( FORMATH Research Society )  22 ( 0 ) 1 - 14   2023.10 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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  <p>Growth and yield projections and current inventory assessment of a forest stand are essential tasks for successfully conducting sustainable forest management. However, much is still unknow about the amount and distribution of forest resources in subtropical island of Okinawa, Japan. Therefore, there is an urgent need to develop an effective and efficient measurement system to evaluate various forest inventory parameters such as tree diameter, tree height, and tree volume for an intricately shaped tree species common in subtropical areas. In recent years there has been rising interest in the so-called Unmanned Aerial Vehicle (UAV) - Structure-from-Motion (SfM) - Multi-View Stereo (MVS) (UAV-SfM-MVS) survey approach, which processes image data captured by UAV to develop 3D models and allows the efficient estimation of various forest inventory parameters of standing trees, without the alteration of the surrounding environment. However, the application of UAV-SfM-MVS survey approach in subtropical areas is scarce. With the aim of establishing a relatively simple but accurate forest measurement method that allows for efficient data collection of broad-leaved tree species common in a subtropical forest, we were able to conduct field experiments and acquire video data from a drone flown under tree canopy. In this paper, we developed a 3D models using SfM-MVS technique to estimate tree diameter and volume. To validate our approach, the proposed method was compared with ground truth measurements. We concluded that our approach was able to estimate tree diameters and stem volumes in our surveyed plots with a high degree of accuracy at root mean square error (RMSE) of 0.4 ~ 0.7 cm for DBH and RMSE of 0.0045 ~ 0.0147 m³ for stem volume within a shorter survey time. Although modeling of tree crown and tree parts where understory vegetation impeded camera view remains a topic for future research, we were able to demonstrate that under canopy UAV-SfM-MVS survey approach is relatively simple but provide highly accurate measurements of standing trees in subtropical forests without altering the surrounding environment.</p>

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• Legal measures for sustainable forestry and policies to promote wood use in Japan

  Ikuo Ota

  Proceedings of the IUFRO OKINAWA 2022 ( IUFRO OKINAWA 2022 Organizing Committee )    20 - 28   2023.07

  Type of publication: Research paper (international conference proceedings)

• Rediscover of the importance of log auction market in Japan: A case study in western Hyogo Area

  Chiharu Maeda, Ikuo Ota

  Proceedings of the IUFRO OKINAWA 2022 ( IUFRO OKINAWA 2022 Organizing Committee )    54 - 59   2023.07

  Type of publication: Research paper (international conference proceedings)

• Price premium for certified wood products in Japan: A case study on cutting boards made of Japanese Cypress (Chamaecyparis obtusa)

  Ota Ikuo, Kamakura Masumi, Konoshima Masashi

  Small-scale Forestry ( Springer )  21 ( 4 ) 647 - 660   2022.10 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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Books 【 display / non-display 】

• Legal protection of agricultural and forestal lands

  Ikuo Ota, Chiharu Maeda, and Marek Geszprych ( Part: Multiple Authorship ,  Legal and Political Aspects of Agricultural and Forest Land Conservation in Japan )

  National Institute for Spatial Management and Housing, Poland  2018.04

  　View Summary

  Japan is a forest rich country. Forests cover 67% of the land area. Because of the steep topography, forests on the slopes are very important for landslide protection and soil erosion control as well as water holding function. Therefore, the Japanese people have been making great efforts to sustain the forest and natural vegetation. At the same time, places suitable for residential and arable land are limited, and aagricultural areas cover only 12% of the land. Conservation of agricultural and forest land has been one of the most important policy issues in the history of this country. The authors describe the features of land use and historical development of several legislations related to the conservation of agricultural and forest land in Japan. Keywords: Agricultural Land Act, conservation forest, Forest Law, landslide protection, soil erosion control, water holding function

Presentations 【 display / non-display 】

Presentations 【 display / non-display 】

• A study on price premium of a forest certified wood product

  Ikuo OTA, Masumi KAMAKURA, Masashi Konoshima

  (University of Tsukuba)  2018.11  -  2018.11 

• Legal and Political Aspects of Agricultural and Forest Land Conservation in Japan

  Ikuo OTA, Chiharu MAEDA

  18th International Symposium on Legal Aspects of European Forest Sustainable Development and Wildlife  (Chisinau, Republic of Moldova)  2018.09  -  2018.09 

• Awakening of the ecosystem service value of the forest in Japan and Taiwan

  Ikuo OTA

  IUFRO 125th Anniversary Congress 2017  (Freiburg, Germany)  2017.09  -  2017.09 

• Practical research in price premium of a forest certified wood product

  Ikuo OTA, Masumi KAMAKURA, Masashi Konoshima

  128th Annual Meeting of the Japanese Forest Society  (Kagoshima University)  2017.03  -  2017.03 

Academic Awards 【 display / non-display 】

Academic Awards 【 display / non-display 】

• Brandl Award

  2022.10.26   IUFRO RG 3.08.00 Small-scale Forestry   Outstanding contribution to the field of small-scale forestry research

  Winner: Ikuo Ota

• Japanese Forest Economic Society Award

  2018.03.29   The Japanese Forest Economic Society   Comparative Study on historical dedelopment of Public Forest Management in Advanced Countries

  Winner: Ikuo OTA

• Japanese Forestry Society Prize

  2002.04.01   Japanese Forest Society   Historical Development of the United States National Forest Management

  Winner: Ikuo OTA

Grant-in-Aid for Scientific Research 【 display / non-display 】

Grant-in-Aid for Scientific Research 【 display / non-display 】

• Grant-in-Aid for Scientific Research(A)

  Project Year: 2014  -  2018 

• Grant-in-Aid for Scientific Research(B)

  Project Year: 2014  -  2016 

• Grant-in-Aid for Scientific Research(C)

  Project Year: 2013  -  2015 

• Grant-in-Aid for challenging Exploratory Research

  Project Year: 2012  -  2013 

• Grant-in-Aid for Scientific Research(B)

  Project Year: 2011  -  2013 

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