アカマツ林の重量生長に関する基礎的研究-2-

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  • アカマツ林の重量生長に関する基礎的研究 (II)(林学部門)
  • アカマツバヤシ ノ ジュウリョウ セイチョウ ニ カンスル キソテキ ケンキュ
  • Fundamental studies on the weight increment of AKAMATSU (Pinus densiflora S. et Z.) stand (II) (Forestry)

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Abstract

The important items among the results of studies on the weight increment in this chapter were as follows : I) Relationships between the stand age and the standard bulk density or the standard contents of celluloses of the stand were expressed by Gompertz's equation. In any case, i.e. the time series variation of the standard value increased at a high pace during its first 25 years, which beyond that maintained to constant. Above relationship of the stand was agreed well with the time series variation of the standard value of single tree. II) Every total productivity curves of dry weight, hollocellulose and α-cellulose in the stand was agreed well with the stand volume curve which showed a sigmoid curve. III) Every current annual increment curves of dry weight, hollocellulose and α-cellulose productivities of the stand increased highly with age, and reached its peak at the point during 20-30 years, which after the point decreased gradually. Every mean increment curves of main and entire tree-crop increased slower than the increasing pace of the annual increment curve. It reached its peak at the point during 35-45 years where it cut the curve for current annual increment, and decreased gradually after the cut point. When the current annual increment of hollocellulose and α-cellulose culminated that it was 5 years latter than the point of dry weight's peak. Furthermore, when the mean annual inc rement reached its highest value became in the order, dry weight, hollocellulose, α-cellulose at 5 years interval thus the age of 35,40 and 45 years. IV) It was clarified even in the actual and theoretical proof that the age of both the current annual and mean annual increment of weight productivities reached their highest value which were 5-15 years latter than their's of the volume increment, on every crops of main, entire and total yield. V) Development process of the standard bulk density and the standard contents of celluloses of the stand which showed the time series variation of the relation between oven dry weight and green volume. These make it possible also to showed widely development process of wood quality. As the concluding remark since above mentioned, the standard value of the stand which gived it us the most important information to solve the incremental process in weight productivities.

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