アカマツの稚樹の伸長成長と地物による日照障害との関係

概要

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The height growth of natural seedlings of Pinus densiflora on the small clear-cut area, belt or square shaped, was studied in relation to the time length of the solar radiation. Results obtained were as follows.1. The growth of seedling near the remained stands was less vigorous, particularly on the southern border of the cut area, and the area, on which the growth of seedling was suppressed, was wider than at the northern border.2. The width of the area of less vigorous growth was being dependent on general topographical circumstances of the area and on the situation of the obstacles such as and trees mountains.3. On the area, where the growth of the seedling seemed to be less vigorous, the time length of the direct solar radiation through the growing season was less than 50% of that of open field.4. When the clear cut area was too small, as 20 m in the case of square, the time tength of solar radiation on the whole area was less than 50% and suppressed seedlings were observed there even on the sunny south slope.5. Observation shows that, on over 50% of the cut belt 25 m wide, time length of solar radiation was often reduced to less than 50% of the open field and the growth of seedlings was much suppressed on such a area.6. The shape and size of a clear cut area, therefore, seems to need more attention in relation to the growth of seedlings.
一般社団法人日本森林学会の論文
1954-06-25