@article{oai:u-ryukyu.repo.nii.ac.jp:02006892,
 author = {砂川, 季昭 and Sunakawa, Sueaki},
 issue = {8},
 journal = {琉球大学農家政工学部学術報告, The science bulletin of the Division of Agriculture, Home Economics & Engineering, University of the Ryukyus},
 month = {Jun},
 note = {The research was made to determine the managemental practices of Ryukyu-Matsu in the mixed forest of the pine and broad-leaved trees. The author reviewed various literatures that published in the Ryukyus on the management Of Ryukyu-Matsu forests and discussed in the historical viewpoint, and described the results of This research. 1. Points that have been considered for its management are as follows. a. For the reviewal of plant growth, importance should be attached to the seed-shedding and natural sprouting, but artificial planting should be considered. b. Trees are better to be closely planted, and broad-leaved trees including soil improving trees are better to be mixed. c. Shelter belts are better to be established and gap clear cutting is to be practiced. d. Final age of the trees is to be 25-40 years. 2. The data of this investigation were taken from two stands in Oku National Forest. Where are about 50 species of broad-leaved trees mixed with the pine trees as the underwood. The ages of the pine trees range from 23 to 38 years, and those of the broad-leaved trees. from 18 to 38 in the stand 1; and in the stand 2, those of the pine trees from 24 to 39, and those of the broad-leaved trees from 15 to 36. The average number age of the pine trees in 33 years and the average area age of the broad-leaved trees in 32 years. The number of the pine trees in the stand I in 940, and that of the broad-leaved trees In 4200; and in the stand 2, that of the pine trees in 530, and that of the broad-leaved trees 7450. The volume of the pine trees per ha in the stand I is 120m^3, and that of the broad- Leaved trees in 90m^3; and in the stand 2,that of the pine tree is 90m^3, and that of the broad-leaved trees is 210 m^3. 3. As the result of the investigation, the following practices are suggested. a. In Oku National Forest, shelter belts should be made principally, in the directions of north-east, east and south-east. b. The number of the pine trees should be increased, and useful species including soil improving trees of broad-leaved trees as the underwood should be encouraged to grow. To improve the forest in that way, useful broad-leaved trees should be artificialy planted without relying upon regeneration by sprouts of advancely grown trees. And tending of trees after regeneration should be actively done. c. Poor trees of the pine are just living and the increment of growth of them are not recognized. Therefore, the age of those in the mixed forests with broad-leaved trees should be limited to certain short period to produce overwoods. d. The final age of the pine is considered that 20-40 years are proper. Especially for the production of pulp wood, the final age of the pine is best considered to be 2025 years. If coppice with standard system is to be practiced, it is best considered to give 40 years for final age of the overwood (the pine) and 20 years trees. Forests where Ryukyuan bamboos are growing, the growth of trees is kindered; therefore, efforts for the control of them should be made., 紀要論文},
 pages = {287--313},
 title = {リュウキュウマツ林の施業に関する研究1},
 year = {1961}
}