ダウンロード数 : ?
タイトルヨミ
ゲンタンリツ ト チョッケイ セイチョウ ノ カンケイ ダイ1ポウ アタラシイ ゲンタンリツ モデル ノ ユウドウ
日本語以外のタイトル
Relation between "Gentan Probability" and "Diameter Growth"(1) : Derivation of new "Gentan Probability" Models
ファイル
言語
日本語
著者
山本 充男
内容記述(抄録等)
1. "Gentan probability" q(j) is the probability that a initial forest will be reserved till j age-class and will be cut in the same j age-class. The probability q(j) is the life span distribution of forest stands in a district. In almost all countries, at present, each individual owner of forests is treating his forests of his own will. So q(j) is considered as a kind of waiting time up to the first replacement. Now we assume that a forest stand will be harvested when the mean diameter is k mm wide. q(j) is considered as the probability that the tree becames k mm across at j age-class. And it imparts a new meaning to q(j), as a waiting time untill the tree becames k mm across. Therefore, we can interpret "diameter growth" and "Gentan probability" in the same model, such as Fig. 1.
2. Applying the Markov Chain theories, the auther derived two formulas which give the life span distribution of forest stands as well as Suzuki's one*.
* F_k(t)=(M<(Mt)>^^^<k-1>)/((k-1)!) exp[-Mt]
F_k(t)=(N<(1-e^<-ct>)>^^^<k-1>/((k-1)!) exp[-N(1-e^<-ct>)]Nce^<-ct>
F_k(t)=(N!c)/(k-1)!(N-k)i <(e^<-ct>)>^^^<N-k+1><(1-e^<-ct>)>^^^<k-1>
掲載誌名
島根大学農学部研究報告
15
開始ページ
42
終了ページ
46
ISSN
0370940X
発行日
1981-12-15
NCID
AN00108015
出版者
島根大学農学部
出版者別表記
Shimane University, Faculty of Agriculture
資料タイプ
紀要論文
部局
生物資源科学部
他の一覧