The Problems of Management and Forest Cultivation Involved in The Scenic Thinning of Chamaecyparis obtusa Forests : Case study in the Chamaecyparis obtusa Forest in the Campus of the Faculty of Agriculture, Shinshu University

In the Chamaecyparis obtusa forest of Shnshu Uiversity, Agriculture department, using scenic thinning and ordinary thinning, the students chose residual trees and trees to be cut and have studied and reported the differences of the residual trees in relation to forest growth aims. Acordingly in Fob. 1993 the thinning was done. The trees cut and sold and income earned. The forest growth aims of thinning scenic forest being the same as regular thinning, the cultivation is also the same. If it is possible to earn from thinning scenic forests, even if that is not their purpose, it is possible to combine, timber production as well. On the other hand, by choosing trees to be cut, the structure and differences in future forest growth can be estimated and therefore produce a difference in the income of future forests. The Chamaecyparis obtusa forest chosen is about 50 years old and has been devided into four groups of 60 trees for comparison. From the difference in thinning, a slight difference in income can be seen in each area, but if look-ed at from a tree-density point, there is almost no difference arising from different methods and an average day's wage would be more outlay, in comparison, to income. In future it can be assumed that the next thinning will be in 15 years and if the same thinning method is used, it can be supposed there would be double the current loss. Therefore even if there is no income, the smaller outlay would be better. The difference in thinning would produce a disparity in residual forest structure. In regular thinning, work to keep tree crowns equal and thinning or felling are necessary. On the other hand, in scenic thinning the complexity of forest structure, undergrowth and the growth of saplings, are taken into account, as well as natural density controll expected, therefore almost no cultivating labor is needed. Furthermore, with the long-term continuation of forests, the growth of large trees grow old and need replacing, they can be removed individually, producing a high income.Article信州大学農学部演習林報告 31: 1-34(1994)departmental bulletin pape