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Recently, increase commercializing of boar meat has been rising in Japan because of increase demand for gourmet tastes, tourists interested in trying boar meat, and village revitalization, etc. The present study was undertaken to identify the relationships between the Ryukyuan wild boar and the forest plants on Iriomote Island, and to identify how best to hunt boar while maintaining a supply for future consumption as its popularity increases. As a result of the investigation, is was found that the diet chiefly contained feed of which there were 30 species of plant and nuts such as acorns. Boar meat's difference in quality depends upon the feed and the season when it eats. The boar's unique smell is not the result of the fat but a result of substances in the boar's blood. While thinking about the ideal way of preserving the environment, ecosystem, and traditional ways of the people who live there, it may be important to develop a way to best hunt wild boar while preserving the sanctity of the aforementioned., 近年，イノシシ肉はグルメプーム，観光ブーム，村おこしブームなどにより商品化が高まりつつある。西表島におけるリュウキュウイノシシと餌資源である森林植物との関係，解体および利用方法を明らかにし，将来的に持続可能な狩猟を行い，食用資源と\nしての需要を図ることを目的とした。\n調査の結果，西表島のリュウキュウイノシシはﾄﾞングリ（イタジイ，オキナワウラジロガシ）などの堅果類を好み，その他主に植物性のものを採食し，餌資源植物には30種あることがわかった。イノシシ肉は，採食する餌の種類，季節により肉質に違いがみられ，旨味は脂肪の量に関係し，特有の臭さは血にかかわりがあると考えられた。, 紀要論文

本研究は, 亜熱帯地域における森林の施業技術を確立することを目的として西表島でおこなったものである。本報告においては, 萌芽林におけるシイタケ原木生産の分析をこころみた。調査の結果を要約するとつぎのとおりである。1現実の常緑広葉樹林におけるha当りのシイタケ原木利用可能木の本数及び本数率は, それぞれ767本, 20%(全体の)であった。2萌芽林の林齢は8年である。3萌芽林におけるha当りのシイタケ原木本数は, 6cm以下, 6cm以上で, それぞれ1,700本, 1,725本であった。4胸高直径と利用高との関係はつぎの式であらわされる。y=-9.066+2.455x+0.106x^2ここに, x : 胸高直径, y : 利用高 5直径6cm以上のha当りの利用可能木の本数は6,000本であった。6実生木及び萌芽木の伐倒解析はTable6に示すとおりである。7タイワンフウの測定結果はTable7に示すとおりである。, The present study was done in order to establish the forest working techniques in subtropics in Iriomote Island. In this paper, the authors tried to analyze the production of the bed-logs for shiitake (mushroom) in sprout forest. The obtained results are briefly summarized as follows : 1. Number of trees and its percentage of marketable trees of the bedlogs for shiitake (mushroom) per hectare in the actual evergreen and broad leaved forest were 767 and 20% of the whole, respectively. 2. The stand age of trees in sprout forest is 8 years old. 3. Number of the bed-logs for shiitake (mushroom) per hectare in sprout forest were 1,700 for under 6cm in diameter and 1,725 for above 6cm, respectively. 4. The regression equation obtained from the diameter at breast height and utilizing height is : Y=-9.066+2.455x-0.106x^2 where; x : diameter at breast height, Y : utilizing height 5. Number of the bed-logs above 6cm in diameter for marketable trees per hectare were 6,000. 6. The cutting analysis of seedling and sprout trees is shown in Table 6. 7. The measurement of sample plantation tree of Liguidambar formosana Hence. is shown in Table 7., 紀要論文

本研究は, 森林の伐採・焼却後の再生過程における植生の変化をはあくするためにおこなった。本報においては, 焼却後2か年目の二次林の実態を明らかにする。調査の結査を要約すると, 次のとおりである。二次林の構成は, 実生木81%, 萠芽木19%であった。二次林の1年生木と2年生木の構成は, それぞれ36%, 64%となっている。実生木の出現樹種は35種であった。樹種別の本数率は, アカメガシワ31%, ウラジロアカメガシワ23%, オキナワシャリンバイ13%, エゴノキ6%, ノボタン5%, ヤマヒハツ5%となっている。これらの6種で全体の83%を占め, 残りの17%は他の29種からなっている。萠芽木の出現樹種は20種であった。樹種別の本数率は, ヤマヒハツ36%, エゴノキ14%, アデク9%であった。これら3種で全体の59%を占め, 残りの41%は他の17種であった。平均樹高は, 実生の1年生木で0.13m, 2年生木で1.62m, 萠芽の1年生木0.14m, 2年生木0.83mであった。最大樹高は, 実生の1年生木0.59m, 2年生木5.08m, 萠芽の1年生木0.79m, 2年生木4.57mであった。本論文を発表するにあたり, 研究の機会を与えて下さった東京農業大学の杉二郎教授, 京都大学の久馬一剛教授, 並びに色々とご協力をいただいた本研究班の方々, 調査とりまとめにご助力をいただいた当熱帯農研の新城健氏, 津嘉山健氏, 津嘉山佳子氏に対し深く感謝の意を表したい。, The present study was done in order to grasp the plant succession in the regeneration process after cutting and burning of forest. In this report, the authors made clear condition of the secondary forest and the sprout trees for the second year after burning. The results of the study are summarized as follows : The composition of the secondary forest were 81% of the seedling trees and 19% of the sprout trees. The composition of one year and two years trees were 36% and 64%, respectively. The number of species in the seedling trees were 35. The percentage of seedling trees by species were Mallotus japonicus 31%, Mallotus paniculatus 22%, Raphiolepis indica 13%, Styrax japonicus 6%, Melastoma candidum 5%, and Antidesma japonicum 5%. These 6 species accounted for 83% of the whole, and the other 29 species, the remaining 17%. The number of species in the sprout trees were 20. The percentage of sprout trees by species were Antidesma japonicum 36%, Styrax japonicus 14%, and Syzygium buxifolium 9%. These 3 species accounted for 59% of the whole, and the other 17 species, the remaining 41%. The mean heights of trees were 0.13m for one year trees and 1.62m for two years trees of seedling, and 0.14m for one year trees and 0.83m for two years trees of sprout. The maximum heights of trees were 0.59m for one year trees and 5.08m for two years trees of seedling, and 0.79m for one year trees and 4.57m for two years trees of sprout., 紀要論文

本研究は, 亜熱帯沖縄における天然林の資源植物学的研究の一環として, 宮古島を対象に森林植物を中心とした資源植物の分布および用途別の分類を行い, 今後の資源植物の収集・保存・増殖および開発・利用を進めていく上での基礎的な資料を得るために行ったものである。調査の結果は次のとおりである。1. 森林資源調査における出現樹種は28種, 樹種別の分布率はCasuarina equisetifoliaモクマオウ38%, Cinnamomum pseudo-pedunculatumヤブニッケイ17%, Pinus luchuensisリュウキュウマツ11%, Acacia confusaソウシジュ6%, Eurya emarginataハマヒサカキ5%, Pongamia Pinnataクロヨナ4%, Diospyros maritimaリュウキュウガキ3%, Hibiscus tiliaceusオオハマボウ3%, Melanolepis multiglandulosaヤンバルアカメガシワ3%の順であった。樹種構成は, 主要島嶼の沖縄島, 石垣島, 西表島に比べて少なく, 単調であった。2. 森林資源調査の推定誤差率は, 平均胸高直径16.4%, 平均樹高11.7%, ha当たり本数26.1%, ha当たり胸高断面積19.1%, ha当たり材積25.3%であった。平均胸高直径および平均樹高は, それぞれ11.0cm, 6.4mであった。ha当たりの本数, 胸高断面積および材積は, それぞれ2,077本, 19.4m^2,76.7m^3であった。3. 宮古島の分布植物は, 在来植物が131科, 405属, 603種で, 外来植物が25科, 64属, 81種であった。そのうち在来植物は広く海外の熱帯地域に分布する植物が120科, 360属, 518種, 国内に限定されて分布する植物が50科, 80属, 85種であった。4. 宮古島と周辺近隣地との在来植物の共通種は, 石垣島563種(93.4%), 西表島559種(92.7%), 沖縄島555種(92.0%)で, 宮古島の約93%の植物が近隣地域に分布している。5. すでに開発・利用されている経済植物は121種で, 全体20%, 未利用・未開発の未経済植物は482種で全体の約80%を占め, 未経済植物は経済植物の約4倍も豊富に自生している。, 6. 経済植物は, I類, II類, III類の3グループに分類され, それぞれI類32科, 56属, 60種, II類22科, 25属26種, III類24科, 30属, 35種を構成した。7. 用途の民族植物学的分類は, I類とII類で, それぞれ17,7のカテゴリーに分類された。そのうち, I類の主なカテゴリーは用材26種, 薬用14種, 飼料9種, 食用9種, 肥料3種であった。8. 最近, 森林資源の新しい利用法として, 森林バイオマスの活用, 低利用・未利用広葉樹および林床植生の利用について検討が始められている。未利用植物の多い宮古島においても新しい活用・利用法の開発が望まれる。, Within the frame work of a series of plant resource studies on the natural forests in the subtropical Okinawa Islands, the present study was undertaken to investigate the distribution of resource plants (focusing primarily on the forest plants in Miyako Island), and to classify the plants by their application and use, with the goal of collecting basic data to be used in collection, preservation, cultivation, development and utilization of plant resources for the future. The following results were obtained. Twenty-eight plant species were confirmed in the forest inventory survey. The most frequent species found in the total forest area were distributed as follows : Casuarina equisetifolia 38%, Cinnamomum pseudo-pedunculatum 17%, Pinus luchuensis 11%, Acacia confusa 6%, Eurya emargionata 5%, Pongamia pinnata 4%, Diospyros maritima 3%, Hibiscus tiliaceus 3%, and Melanolepis multiglandulosa 3%. The number of tree species in Miyako Island was smaller than that on other majors islands constituting the Okinawa Islands (Okinawa Island, Ishigaki Island, Iriomote Island). Thus, the tree species were relatively mono tonous on Miyako Island. In this forest inventory survey, the sampling error is estimated to be 16.4% for the mean diameter at breast height, 11.7% for the mean tree height, 26.1% for the number of trees per hectare, 19.1% for the basal area per hectare, and 25.3% for the volume per hectare. The mean diameter at breast height was 11.0cm. The mean tree height was 6.4m. The number of trees per hectare was 2,077. The basal area per hectare was 19.4m^2 and the volume per hectare was 76.6m^3. In Miyako Island, 603 indigenous plant species, belonging to 405 genuses of 131 families, and 81 introduced plant species, belonging to 64 genuses of 25 families, were confirmed. Of the indigenous plants, 518 species (360 genuses of 120 families) are known to be dis tributed widely in foreign tropical areas, and 85 species (80 genuses of families) occur only in Japan. The indigenous species commonly found in Miyako Island and the neighboring islands were investigated. Of all species found on Miyako Island, 563 (93.4%) also occurred on Ishigaki Island, 559 (92.7%) on Iriomote Island and 555 (92.0%) on Okinawa Island. Thus, about 93% of the species found Miyako Island were also found in the neighboring island. Of all species found in Miyako Island, 121 (about 20%) are plants that have already been exploited, and 482 (about 80%) are unexploited plant.\n Thus the number of unexploited plant species was about 4 times that of the exploited ones on this island. The exploited plant were divided into three groups (I, II and III) according to their uses. Group I contained 60 species (56 genuses of 32 families), Group II 26 species (25 genuses of 22 families) and Group III 35 species (30 genuses, of 24 families). The plant were divided into Group I and II, according to their ethnobotanical classification. Group I and II were subdivided into 17 and 7 categories, respectively. The major categories in Group I were timber (26 species), medicine (14 species), forage (9 species), food (9 species), and fertilizers (3 species). In recent yeas, new ways of utilizing forest resources such as utilization of forest biomass, hitherto poorly utilized or unutilizedbroad-leaf tree and ground plant have been studied. It is desirable that new methods of making use of the previously unutilized plant abundantly found on this island be developed., 紀要論文