47.北海道北部の泥炭地における前生林の造成法(3) : 4年後の植栽成績(会員研究発表講演)

概要

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The purpose of the present study is to establish low tree belts-by new methods of the machinary land-preparation and wood-cutting-on the peat-bog covered by reeds. The results are as follows: 1. Japan poplar (Populus maximowiczii) reached max, 3.5 and standard 2.2 meter high for 3 years : this will be able to reach 10 meter high in 10 years. Willows (Salix sachalinensis and two others) grew as much as the former : about 4 meter high is already sufficient as a low tree belt. 2. Weeding is indespensable-3 and 2 times in the 1st and 2nd year respectively-for these light-demanding plants which must reach 1.5 meter high in 2 years to escape the shade-effect by tall, vigorous weeds. 3. To grow the poplar and willows in peat-bog have succeeded apporoximately in my anticipation. However, wood-cuttings and conifer plants in peat-pots should plant at the same time, not to make harder the land-preparation and weeding. 4. Generally speaking, peat-bog is wet land with thick peat accumulation; but there must be the sites with sand-gravel layer shallowly beneath the peat near rivers. Therefore, economical forestry should start from such sites, on where trees can grow quicker than on the deep peat-bog.
北方森林学会の論文
1970-02-28