Modelling Volume Growth for Two-Storied Sugi (<I>Cryptomeria japonica</I>) Stands
スポンサーリンク
概要
- 論文の詳細を見る
The growth process of overstory and understory trees in two-storied stands is described synthetically. First, the following assumption was added to the four concerning photosynthetic production and respiratory loss in pure even-aged stands : In two-storied stands with closed understory canopies, the net photosynthesis rate per unit area is constant, and it is larger than that in pure even-aged stands. Next, growth equations for tree volume v were derived as follows : <I>dυ/dt</I>=(<I>γA</I>/Σ<I>υ<SUP>n</SUP></I>)<I>υ<SUP>n</SUP>-bυ</I><SUP>2/3</SUP> when the canopy is closed, <I>dυ/dt</I>=(<I>γαAV<SUP>β</SUP>N<SUP>1-β</SUP></I>/Σ<I>υ<SUP>n</SUP></I>)<I>υ<SUP>n</SUP>-bυ</I><SUP>2/3</SUP> when the canopy is open, where <I>V</I> is stand volume, <I>N</I> is stocking, <I>A</I> is a constant depending on species and site, b and β are constants depending on species, α is a constant depending on species before the first canopy closure and depends on thinnings after it ; γ is 1 for overstory trees, and it depends on the stand volume and the stocking in the overstory for understory trees. In this model, it is assumed that only the canopy of the overstory causes a growth decrease in understory trees, and parameter γ describes the degree of shading. Furthermore, assuming height growth, a method for predicting the growth in twostoried stands is proposed on the basis of the model. The method was applied to a two-storied sugi (<I>Cryptomeria japonica</I> D. DON) stand and the validity of the model was examined. Finally, the assumptions in the model are discussed.
- 日本森林学会の論文
日本森林学会 | 論文
- 渓流の有機物をはかる(森をはかる その33)
- 「森は本当に海の恋人?」-森・川・海の生態的関係を探る-セッション報告(第116回日本森林学会 テーマ別セッション)
- 流域の視点から見た水辺域の変化と管理(水辺林 森林-川-海をつなぐもの)
- H^+収支を用いた森林植生が酸中和機構に与える影響の評価
- 森林の成立に伴う流域内酸中和機構の変化 : 植生と土層厚が酸中和機構に与える影響