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No.65 (2018/12) >

Title :地形-降雨特性と木材収穫活動および土地利用変化に基づく沖縄島北部地域の森林景観の空間分布の評価
Title alternative :Evaluating spatial distribution of forested landscape in northern region of Okinawa main island based on topographic- and rainfall characteristics, timber harvesting activities, and land-use changes
Authors :芝, 正己
アジタ, A.Z
.ジャナツン, N.J
Authors alternative :Shiba, Masami
Azita, Binti Ahmad Zawawi
Janatun, Noor Naim Binti Jemali
Issue Date :31-Dec-2018
Abstract :The Yambaru region located in the northern part of Okinawa main island belongs to a subtropical marine climate zone. Such meteorological environment has created the bountiful forests of Yambaru and those forests have nurtured important habitats for a large number of internationally recognized endemic and native species. The Yambaru National Park was established in 2016 and comprises a land area of 13622 ha in the villages of Kunigami, Ogimi, and Higashi. Presently there are efforts being made to designate the Yambaru forests as a World Natural Heritage Site. On another front, during the age of the Ryukyu Kingdom, the Yambaru forests were respectfully managed under the Somayama system established by Sai On who was Three Chancellor of the Ryukyu Court. Within this system, timber from the Yambaru forests was shipped mainly for building, for heating and for wooden products necessary for urban dwellers life and reforested areas after harvesting trees, thereby protecting the forest under a traditional practical knowledge. Now the Yambaru forests are owned by various stakeholders who include the government, prefecture, three municipalities, and individuals with different management goals. The critical issues being occurred in Yambaru forests are on how to improve society’s perception and understand the sustainable forest management. This study was carried out to assess the potential forested landscape in Yambaru region through topographic and watershed properties, timber harvesting activities and population and land use transition. Three main parts of the study consist of 1) characterization of topographic and watershed attributes, 2) terrain analysis based on DEM and time series analysis of rainfall data, and 3) elevation- based zoning of forested landscape in Yambaru region.
県全体の森林面積の約 26%を占める沖縄島北部のやんばる地域は,18 世紀初頭の琉球王府時代から林業の中心であっ たが,近年は森林の生態系サービスを主体とした様々な便益 機能の発揮が期待されている.すなわち,亜熱帯常緑照葉樹林 は,本島全域の水源地として重要な役割を果たしており,しか も絶滅が危惧されている多くの貴重な固有種の生息地域とし て,「やんばる国立公園:2016 年 9 月 15 日指定」,「奄美大 島,徳之島,沖縄島北部及び西表島世界自然遺産候補地:2020 年登録を目標」にもあげられている.一方で, 2016 年 12 月に は北部訓練場の一部(約 4166ha)が返還され,その内の約 3700ha が国立公園に編入された.このように,やんばる地域 の森林の取り扱いの問題は,従来にも増して地域社会を巻き 込んだ複雑な状況を呈してきている.本報告では,“将来を見据 えたやんばる地域の森林景観の姿やその在り方とは何か?” を模索することを主眼として, 現在の森林景観を生み出して いる諸条件,特に地形や流域特性, 森林の伐採量の変化や人 口・土地利用(耕作地面積)の推移等を通して検討を行った. また,それらの結果と「やんばる国立公園」や「沖縄島北部世 界自然遺産推薦候補地」の機能区分・ゾーニングとの関連性 について考察した.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/44588
Appears in Collections:No.65 (2018/12)

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