Treatment of unsuccessful Cryptomeria japonica plantations in the snowy region : Management plan from the viewpoint of the height growth process of Cryptomeria and broad-leaved trees

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  • 積雪地帯におけるスギ不成績造林地の取扱い : スギと広葉樹の成長過程からみた施業案
  • セキセツ チタイ ニ オケル スギ フセイセキ ゾウリンチ ノ トリアツカイ スギ ト コウヨウジュ ノ セイチョウ カテイ カラ ミタ シギョウアン

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Abstract

The height growth process of the trees in unsuccessful plantations of Cryptomeria japonica with broad-leaved trees and shrubs were analyzed in the snowy region of Gifu Prefecture, central Japan. The broad-leaved species grew after weeding or improvement cutting. The Cryptomeria appeared at a canopy layer in the all of stands, and also existed at understory in many stands. On the whole, the height of the broad-leaved trees was same or lower as the height of the canopy Cryptomeria. The growth rate was large in Betula platyphylla var. japonica and B. maximowicziana, medium in B. grossa and Magnolia obovata, small in the canopy Cryptomeria, Quercus mongolica var. grosseserata and Fagus crenata, and specially small in the understory Cryptomeria and shrubs. The growth rate of each species and the tending after planting were factors affecting the future forest type. The improvement cutting especially had great effect on the development of forest. Based on this examination, the following was proposed. The result of the afforestation is evaluated from density and average tree height of the Cryptomeria, and in the unsuccessful plantation, the improvement cutting is stopped. In the unsuccessful plantation with enough merchantable broad-leaved trees, trees suppressing crop trees may be removed.

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