{"created":"2023-07-25T08:04:12.773688+00:00","id":2359,"links":{},"metadata":{"_buckets":{"deposit":"c3296dcd-384e-4f5e-9649-7c6f1e0506ae"},"_deposit":{"created_by":18,"id":"2359","owners":[18],"pid":{"revision_id":0,"type":"depid","value":"2359"},"status":"published"},"_oai":{"id":"oai:ir.kagoshima-u.ac.jp:00002359","sets":["70:72"]},"author_link":["76799","76800","126122"],"item_5_date_6":{"attribute_name":"作成日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2012-03-16","subitem_date_issued_type":"Issued"}]},"item_5_description_4":{"attribute_name":"要約(Abstract)","attribute_value_mlt":[{"subitem_description":"沖縄県の畑地では，降雨時に赤土流出が発生することでサンゴ礁やリュウキュウアユなどの生態系および観光経済に与える影響が懸念されている．そこで工学的に様々な対策方法が提案されてきたものの，発生源である農地での対策導入は十分ではなく，その主な要因には，農家の「費用と労力の負担」があるとされ，農業政策・経済の分野では経済的な支援策の導入を求める意見もある．経済的な支援策の導入には，税金の支出を伴うことから，費用対効果分析による合理的な決定が求められる．そこで本研究では，CVM調査と対策費用の算出より，沖縄県民の赤土流出防止対策費用負担意思額を明らかにした．次に，沖縄県国頭村と東村でのアンケートにより赤土対策導入の現状と農家意識について把握し，モンテカルロ（MC）シミュレーションを用いた赤土流出量計算により，補填率の違いによる赤土流出量変化および対策費と赤土流出量の関係を検討した．さらに，CVM調査で得た自由回答欄に記述される意見の違いによって，選択される支払意思と費用負担の主体に違いがあるのかという関係性についてテキストマイニングを用いて検討した．以上の研究内容より，得られた結果は以下の通りである． \n1）CVM調査によって得られたWTPより，沖縄県民の総世帯数497,100世帯（2006年8月1日沖縄県推計人口）を乗じることでTWTPを得た．一方で対策費用の算出には，対策農地に，さとうきび夏植え（6,060ha），さとうきび春植え（1,480ha），パイナップル（601ha）とし，対策方法を，グリーンベルト（6,428/10a），葉ガラ梱包（10,080/10a），敷き草マルチ（25,725/10a）とした．それぞれの農地でかかる費用を，単一の対策方法が導入された場合を想定し，費用総額を算出した．その結果より，合意形成の可能性について明らかにした．\n2）赤土対策導入の現状は，マルチングとグリーンベルトの認知が高く，導入農家が多かった．また，農家の対策導入意思は，100%補填で90%以上，50%，0%では減少し，100%補填で意思の無い農家は150%補填でも意思が無かった．情報不足での赤土流出量推定値はばらつき，MCシミュレーションによる確率的把握が有効である．対策費用と赤土流出量に明確な関係はないが，両者にはパレート関係にある包絡線が描け，MCシミュレーションにより費用対効果を考慮した事業計画が可能であるといえる． \n3）自由回答欄に記述された意見をテキストマイニングし，意味のある言語の最小単位である形態素をキーワードとして捉えた．しかしながら，テキストマイニングだけでは，回答者が込めたメッセージを十分に読み取れないことがわかった．そこで本研究では，得られたキーワードから文章に戻るという作業を行って，回答者のメッセージを読み取ることができるようにした．その結果，「行政」は，政策実施者であり，赤土流出問題の主体の1つであるとされる．「農家」は赤土流出防止対策の実施者であり，赤土流出問題の主体の1つとして認識されているが，赤土流出問題は農家だけの責任ではないという指摘も多くある．「県民」は，赤土流出問題の1つとして認識されており，政策の実施者と支援者の両面を持つ主体として捉えられている．従って，「行政」，「農家」，「県民」それぞれは赤土流出問題に関係する主体として認識されているといえる． \n\n連合農学研究科博士論文(農学) ; 学位取得日: 平成24年3月16日","subitem_description_language":"ja","subitem_description_type":"Other"},{"subitem_description":"In Okinawa there is a worry that red soil runoff (RSR) by rainfall in agricultural watershed is causing serious damage to local ecosystem such as coral reef and Ryukyu-ayu (plecoglossus altivelis ryukyuensis) as well as tourism that depends on beautiful nature. Although various prevention measures have been proposed and implemented, measures to prevent RSR from farmlands are not enough. Major limiting factor is farmers' cost and labor. Therefore, some people emphasize the need of financial supports to farmers. For the introduction of financial supports, a rational decision based on cost benefit analysis is needed to justify tax expenditure. The purpose of this study is to clarify the feasibility of financial supports for RSR prevention. Firstly, evaluation by contingent valuation method (CVM) of willingness-to-pay of local residents for RSR prevention was conducted. Next, the situation of RSR prevention measures (RSRPM) in Kunigami and Higashi Villages, Okinawa, was analyzed. The amount of RSR was calculated using Monte Carlo (MC) simulation. Then the relationship between subsidy rate and farmer's willingness to introduce RSRPM was studied by the questionnaire survey. Moreover, through the analysis of answers to the open question in CVM survey, the relationship between willingness-to-pay and cost burden types was studied. As a result, the following was concluded.\n1) Total Willingness-to-Pay was calculated multiplying WTPs derived from CVM survey by 497,100 households (statistics of Okinawa prefecture as of August 1, 2006). On the other hand, the cost of RSRPM was calculated multiplying the total farmland area for each crop type (summer-planted sugarcane, spring-planted sugarcane, and pineapple) and unit cost for each prevention measure (buffer area method, straw rolls method, and mulching method). Based on these results possible prevention measures have been identified. 2) (1) Among the prevention measure alternatives, mulching and green-belt were popular for farmers. (2)Farmers’ willingness to introduce the RSRPM was more than 90% in the case of the 100% subsidy and decreased in the case of the 50% and 0% subsidy. Farmers who did not have the willingness to introduce the RSRPM in the case of 100% subsidy did not have it even in the case of 150% subsidy. (3) The estimated value of RSR had variance under the condition of the insufficient information but the stochastic grasp of RSR by the MC simulation was effective. (4) There was no clear relationship between the cost of the RSRPM and the estimated RSR value, but there was a pareto relationship between these values and MC simulation was effective for the preliminary planning of cost-effective RSRPM. 3) We analyzed a text data for the free-answer questions of the CVM surveys. A morpheme, which is the smallest unit of meaningful language, was taken as a keyword. However, we were not sufficiently able to read respondent's messages by text mining. In this study, we were able to read respondent's messages through the working to the return to sentence from keywords gotten by text mining. As a result, written on the free-answer column was respondent's much opinion.","subitem_description_language":"en","subitem_description_type":"Other"}]},"item_5_full_name_2":{"attribute_name":"著者よみ","attribute_value_mlt":[{"nameIdentifiers":[{}]}]},"item_5_full_name_3":{"attribute_name":"別言語の著者","attribute_value_mlt":[{"nameIdentifiers":[{}]}]},"item_5_publisher_23":{"attribute_name":"公開者・出版者","attribute_value_mlt":[{"subitem_publisher":"鹿児島大学","subitem_publisher_language":"ja"},{"subitem_publisher":"カゴシマ ダイガク","subitem_publisher_language":"ja-Kana"},{"subitem_publisher":"Kagoshima University","subitem_publisher_language":"en"}]},"item_5_subject_15":{"attribute_name":"NDC","attribute_value_mlt":[{"subitem_subject":"611","subitem_subject_scheme":"NDC"}]},"item_5_text_52":{"attribute_name":"学位番号","attribute_value_mlt":[{"subitem_text_value":"連研第721号"}]},"item_5_version_type_14":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"土屋, 博樹","creatorNameLang":"ja"},{"creatorName":"ツチヤ, ヒロキ","creatorNameLang":"ja-Kana"},{"creatorName":"Tsuchiya, Hiroki","creatorNameLang":"en"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2016-10-27"}],"displaytype":"detail","filename":"diss_TSUCHIYA_Hiroki_2012.pdf","filesize":[{"value":"2.4 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"diss_TSUCHIYA_Hiroki_2012.pdf","objectType":"fulltext","url":"https://ir.kagoshima-u.ac.jp/record/2359/files/diss_TSUCHIYA_Hiroki_2012.pdf"},"version_id":"c1171888-c392-4a4d-b387-8c7d1aa57bd2"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"thesis","resourceuri":"http://purl.org/coar/resource_type/c_46ec"}]},"item_title":"沖縄県における赤土流出防止対策導入に対する公的支援に関する研究","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"沖縄県における赤土流出防止対策導入に対する公的支援に関する研究","subitem_title_language":"ja"},{"subitem_title":"オキナワケン ニオケル アカツチ リュウシュツ ボウシ タイサク ドウニュウ ニ タイスル コウテキ シエン ニ カンスル ケンキュウ","subitem_title_language":"ja-Kana"},{"subitem_title":"Study on public supports for adoption of red soil runoff prevention measures in Okinawa, Japan","subitem_title_language":"en"}]},"item_type_id":"5","owner":"18","path":["72"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2014-12-25"},"publish_date":"2014-12-25","publish_status":"0","recid":"2359","relation_version_is_last":true,"title":["沖縄県における赤土流出防止対策導入に対する公的支援に関する研究"],"weko_creator_id":"18","weko_shared_id":-1},"updated":"2024-01-09T02:52:43.700686+00:00"}