Soil properties and growth of Japanese red pine (<i>Pinus densiflora</i>) in the hilly and low-mountainous region of Central Japan

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  • 中部低山地帯の土壤の性質とアカマツの生長
  • 中部低山地帯の土壌と性質アカマツの生長
  • チュウブ テイ サン チタイ ノ ドジョウ ト セイシツ アカマツ ノ セイチ

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Abstract

A comparative analysis of soil properties and growth of Japanese red pine (Pinus densiflora S. and Z.) at the Tokyo University Forest located at Seto and Inuyama in Aichi Prefecture was made. In this area, Pliocene gravel sediment, Neogene and Paleozoic strata, and granite are the main soil-parent materials. In general, the soils are immature and are exceedingly acidic. All have small carbon and nitrogen contents, large C/N ratios, and low fertility. The site indices for Japanese red pine (height at 30 years) associated with each sample tree were analized. The relationships obtained reflecting the differences of topog-raphy and the growth of Japanese red pine on each parent-material area were as follows: on the middle and lower slopes in areas of Paleozoic strata and granite, and on the lower slopes of Neogene strata, the site indexes were 10_??_12; on ridge tops and middle slopes of Neogene strata, the site indexes were 6_??_8. On the ridge tops of Neogene strata, the growth was inferior; therefore the site index was 4. We concluded that on the ridge tops in all areas the vegetation cover was very poor and the soils were unstable, making it necessary to maintain existing vegetation and to make amendments and fertiliza-tion to improve soil conditions and the forest cover.

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