{"created":"2023-06-19T08:46:11.192473+00:00","id":4934,"links":{},"metadata":{"_buckets":{"deposit":"9930199a-5de4-414f-8608-20ec4f95c7b5"},"_deposit":{"created_by":14,"id":"4934","owners":[14],"pid":{"revision_id":0,"type":"depid","value":"4934"},"status":"published"},"_oai":{"id":"oai:kpu.repo.nii.ac.jp:00004934","sets":["47:273:418"]},"author_link":["7392"],"control_number":"4934","item_1696926521561":{"attribute_name":"その他（別言語等）","attribute_value_mlt":[{"subitem_alternative_title":"Relative Volume of Stem and Its Growth (Forestry)","subitem_alternative_title_language":"en"}]},"item_3_biblio_info_12":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1974-10-31","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"87","bibliographicPageStart":"74","bibliographicVolumeNumber":"26","bibliographic_titles":[{"bibliographic_title":"京都府立大學學術報告. 農學","bibliographic_titleLang":"ja"},{"bibliographic_title":"The scientific reports of Kyoto Prefectural University. Agriculture","bibliographic_titleLang":"en"}]}]},"item_3_description_10":{"attribute_name":"抄録(日)","attribute_value_mlt":[{"subitem_description":"幹の高さをh, 基準直径をd_<0.9>とするとき, 幹曲線Y=F(X)において, x=X/h, y=Y/d_<0.9>とおくと, 相対幹曲線y=f(x)がえられる。このとき, 相対材積はつぎの式によって定義される : [numerical formula]相対材積を用いるときは, 幹材積はv=hd^2_<0.9>θ_<0.9>, 林分材積はV=(θ^^^)-_<0.9>Σhid^2_<0.91>として与えられる。相対材積はまた正形数に代って形状度の指標として用いられ, さらに高さの基準直径に対する比γ=h/d_<0.9>との積ω=γθ_<0.9>をつくれば, それによって幹の完満度をもあらわすことができる。このように相対材積は幹材積や林分材積の基本的な構成因子として位置ずけられると同時に, 幹形の指標としても有効である。相対材積の生長についてはいままで明らかでなかったので, 実験的にその解明を試みた。相異なる2つのスギ人工同齢林分から5本ずつの標本木をえらび(表1,表2), それらに樹幹析解法を適用して得られた齢階毎の測定資料に, 最小自乗法によって5次の多項式をあてはめ(図2,図3), 齢階毎の相対幹曲線を求めた。これより齢階毎の相対材積および関連諸量を計算した結果は表3および表4のとおりである。とくに相対材積の値を齢階毎に示し, その平均値を求めると表5および表6のとおりである。表5および表6の平均値を用いて相対材積の生長過程を曲線で示すと図8のようになる。これによって相対材積が生長すること, およびその生長過程は林分によって異なることが明らかにされた。またγおよびωの生長過程については, 個体間の変動が大きいが, 相対材積のそれについては, 同一林分内では, 個体間の変動は大きくないことが明らかにされた。","subitem_description_language":"ja","subitem_description_type":"Other"}]},"item_3_description_11":{"attribute_name":"抄録(英)","attribute_value_mlt":[{"subitem_description":"Let us consider a stem which has the total height of h and the diameter of d_<0.9> at ninetenths of the total height from the top. d_<0.9> should be called the normal diameter in this report. Now, we generally express the stem curve by the function Y=F(X), where Y is radius at distance of X from the top. When we put x=X/h and y=Y/d_<0.9> in the above formula, we have the relative stem curve. Revolving the relative stem curve around its X-axis, we obtain a solid, in which both the height and the diameter at distance of ninetenths are equal to 1. We will call such a solid the \"fundamental body\", and its volume the relative volume, which is given by [numerical formula] As the actual stem can be regarded as the fundamental body expanded by h times for the height and d_<0.9> times for the diameter, its volume can be expressed by v=hd^2_<0.9>θ_<0.9> The form of the vertical profile containing the axis of the fundamental body is noting but the relative stem form. Therefore, the relative volume is useful as an index of the relative stem form. On the other hand, the actual form of the stem is given by the relative stem form in conjunction with the ratio of the height to the normal diameter, as shown in Fig. 1. When we make the product ω=γθ_<0.9> where γ=h/d_<0.9>, ω may effectively express the tapering grade in the actual stem form. From its determination, the relative volume is independent of both the height and the normal diameter. Therefore, the volume of a stand which is composed of the number of trees of N is given by [numerical formula] where [numerical formula] This relation is advantageous for analysing the stand structure. In order to make clear the process of growth of the relative volume, we chose 5 sample trees from each of two artificial and even aged stands of Cryptomeria japonica, as shown in Tables 1 and 2,and to each of them, we applied the method of the stem analysis to get the data necessary to estimate the stem curves in the past. The polynomial of degree five adopted as the stem curve and fitted to the data of each age class of each sample tree through the least square method. The estimated stem curves are shown in Fig. 2 and 3. They were then reduced respectively to their relative stem curves, on which the examples of the relative stem form are shown in Fig. 4 and 5. The relative volume and the other characteristics of the stem form were calculated for every age class of every sample tree, and listed in Tables 3 and 4. Among them, the values of the relative volume were rearranged by age class in Tables 5 and 6. Using the mean values of relative volumes by age class, we obtained the growth curves of the relative volume, as presented in Fig. 8. From the results, it may be recognized that the relative volume of stem incleases with age, approaching a upper limit, and that the processes of growth are different from each other by stands. It may, however, be possible that the relative volume first increases with age, and then, after reaching its maximum at a relatively higher age, decreases gradually. From Fig. 7,it is further recognized that the variation in the process of growth of the relative volume among stems is, in a even aged stand, much smaller than that of γ and ω. Further more, the relation between θ_<0.9> and the relative diameter at the middle η_<0.5> is so close that we may estimate the value of θ_<0.9> by measuring η_<0.5>, as shown in Fig. 9.","subitem_description_language":"en","subitem_description_type":"Other"}]},"item_3_source_id_1":{"attribute_name":"雑誌書誌ID","attribute_value_mlt":[{"subitem_source_identifier":"AN00062275","subitem_source_identifier_type":"NCID"}]},"item_3_source_id_20":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"00757373","subitem_source_identifier_type":"PISSN"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorAffiliations":[{"affiliationNameIdentifiers":[],"affiliationNames":[{"affiliationName":""}]}],"creatorNames":[{"creatorName":"大隅, 眞一","creatorNameLang":"ja"},{"creatorName":"オオスミ, シンイチ","creatorNameLang":"ja-Kana"},{"creatorName":"Osumi, Shinichi","creatorNameLang":"en"}],"familyNames":[{},{},{}],"givenNames":[{},{},{}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2017-02-20"}],"displaytype":"detail","filename":"KJ00000078933.pdf","filesize":[{"value":"1.1 MB"}],"format":"application/pdf","mimetype":"application/pdf","url":{"label":"KJ00000078933.pdf","url":"https://kpu.repo.nii.ac.jp/record/4934/files/KJ00000078933.pdf"},"version_id":"1b23da6d-7012-4a52-babe-be2cc37ed8be"}]},"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":"departmental bulletin paper"}]},"item_title":"相対材積の概念とその生長(林学部門)","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"相対材積の概念とその生長(林学部門)","subitem_title_language":"ja"}]},"item_type_id":"3","owner":"14","path":["418"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2017-02-20"},"publish_date":"2017-02-20","publish_status":"0","recid":"4934","relation_version_is_last":true,"title":["相対材積の概念とその生長(林学部門)"],"weko_creator_id":"14","weko_shared_id":-1},"updated":"2024-04-25T04:47:27.857861+00:00"}