@article{oai:soar-ir.repo.nii.ac.jp:00011238,
 author = {島崎,  洋路},
 journal = {信州大学農学部演習林報告},
 month = {Oct},
 note = {Afforestation of healthy Japanese larch is today's urgent subject to be studied. The author investigated on a subject of thinning of Japanese larch stands. The items studied and the results obtained were summarized in the following five chapters. Chapter 1: Several problems regarding to the present conditions of Japanese larch stands were pointed out. Based on these points, harvest crops of thinning woods and final cutting were estimated, and some possible utilization and price fluctuations of these harvested woods were riviewed in this chapter. The total area of Japanese larch land is above one million ha, which corresponds to 10% of the total area of the man-made-forest in Japan, and the growing stock of Japanese larch is estimated to exceed one hundred million m3. In addition, more than 90% of the total area of Japanese larch land is occupied with relatively young trees planted after 2nd World War. About 50% of this Japanese larch land considered to be cut down within the coming 10 years. By this thinning, the estimated wood mass of Japanese larch is to be one million m3 per year. On the other hand, harvest mass of final cutting of Japanese larch is estimated to increase gradually from today's seventy thousand m3/year, and will be one million m3/year after 10 years and reach three to four million m3/year after 20 to 30 years. After 1980, the total production of Japanese larch woods has been increasing from 1,200,000m3/year to 1,800,000m3/year, and these woods are distributed into the following utilization purposes, that is, sawing by 60%, pulptips by 25～27% and others by 12～13%. No obvious fluctuations in prices is observed in thinning woods, and the price is still about 15,000yen/m3. Chapter 2: Practical surveys of recent Japanese larch lands were carried out. Two actual instances observed were described in this chapter. The first one is concerned to the present conditions of the typical expansive afforestation of Japanese larch. This sort of expansive afforestation is now in lack of tending. Therefore, facts of overcrowded stand and inferiority of locality class of forest land were ascertained. A second instance is a case of overcrowded stand of Japanese larch. Such Japanese larch stands are going to be ruined if they are left as they are. So thinning of these stands are required to be urgently carried out. Chapter 3: Thinning guides toward such overcrowded stands have not been made. In this chapter, the author proposed a new thinning guide toward such stands and compared it with existing density of forest trees guide. Chapter 4: In this chapter, the author described the results obtained by the following four thinning methods. 1. Intense low thinning method 2. 1/3 row thinning method 2. 1/2 row thinning method 4. Marking trees-thinning method (Upper story thinning) Each method damands to keep upper crown of trees mildly strong. Chapter 5: In this chapter, the author described logging means of thinned woods from forest lands so that these woods can be utilized as much as possible. Maintenance of forest roads network and suitable selection and conbination of machines for logging are temporally considered to be a practical and effective method for this purpose, although much still remain to be improved., Article, 信州大学農学部演習林報告 23: 1-117(1986)},
 pages = {1--117},
 title = {高密カラマツ林の間伐に関する研究},
 volume = {23},
 year = {1986}
}