林分枝下高曲線の解析―ミクロ的風致視点からの林分解析―
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概要
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Between a forest stand and the observer, there are pleasing compositional relations in various views which the obserber gets as he moves about. We will call these relations "the forest amenity", and above all the direct relations between a forest stand and the observer in nearer distance "the forest microamenity". A theory of forest micro-amenity design, as of the other fine arts, must be based on a subjective definition of beauty, which ulitimately attributes to the taste and style in forest micro-amenity materials. And forest micro-amenity materials are mainly forest flora, which consists of the canopy group and the underbrush group. And also the shape, colour and, texture of the canopy and underbrush groups often play a dominant part in "the forest micro-amenity". Taking consideration of the above mentioned, we tried to analyse the forest stand from the visual point of "the forest micro-amenity". But this treatise deals with only the analysis of the canopy group, because it has been difficult to analyse the underbrush group. In the first part of this treatise, we explained the method of analysis of the forest flora from the visual point of "the forest micro-amenity". In the second part, we explained the method of analysis of the clear height of trees in an even-aged stand from the stable clear height of trees and the mean height of trees by use of data gathered at Miyata and Minami-minowa villages in Southern Nagano region in October, 1967. The form and characteristic of these curves may be summarily pointed out as follows: 1. The curve of clear height of trees in a even-stand is shown on the graph, in which distance from forest edge is used as the abcissa and clear height of trees as the ordinate. 2. The curve of clear height of trees is a hyperbola: (x-a)(y-b)=c x: distance from forest edge (negative value) (m) y: clear height of trees (m) a, b and c: constants 3. In case of Japanese red pine forests at Miyata and Minamiminowa villages, Nagano prefecture, these constants of hyperbola were estimated in the function of the stable clear height in an even-aged stand. a=0.14h-0.61 b=1.04h+0.30 log c=0.12362h-0.20526 h: stable clear height in a stand (m) 4. The values of the constants a, b and c are increasing with stand age or mean height of the stand. Therefore the curve transfers upward and outerside in process of time. 5. The growth of the curve of clear height of trees was estimated by use of the mean height of a stand. 6. From the visual point of the clear height of trees, the width of forest edge is narrower in younger stand than in older stand, and the characteristic of forest edge is more remarkable in younger stand than in older stand.
- 信州大学農学部の論文
- 1968-06-25
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