Multi storied forests in the Kitayama River Basin, Mei Prefecture

Research Project

Project/Area Number	61560165
Research Category	Grant-in-Aid for General Scientific Research (C)
Allocation Type	Single-year Grants
Research Field	林学
Research Institution	Mie University
Principal Investigator	KASAHARA Rokuro Mie University.Faculty of Bioresources (Faculty of Agriculture) Professor, 生物資源学部(農学部), 教授 (20024531)
Co-Investigator(Kenkyū-buntansha)	SHIMADA Kosaku Mie University. Faculty of Bioresources (Faculty of Agriculture) Lecturer, 生物資源学部(農学部), 講師 (00024563) TANAKA Kazuhiro Mie University. Faculty of Bioresources (Faculty of Agriculture) Associate profe, 生物資源学部(農学部), 助教授 (70155117) TAKEDA Akimasa Mie University. Faculty of Bioresources (Faculty of Agriculture) Associate profe, 生物資源学部(農学部), 助教授 (70024578) 三輪光博東京大学, 農学部, 助教授 (60011996)
Project Period (FY)	1986 – 1987
Project Status	Completed (Fiscal Year 1987)
Budget Amount *help	¥2,100,000 (Direct Cost: ¥2,100,000) Fiscal Year 1987: ¥600,000 (Direct Cost: ¥600,000) Fiscal Year 1986: ¥1,500,000 (Direct Cost: ¥1,500,000)
Keywords	Multi storied forest / Selection cutting / Stand structure / 熊野林業 / 複層林施業 / 択伐林
Research Abstract	1. The number of multi storied forest has been decreasing in the basin of the Kitayama River, because multi storied operation has more demerits than clear cutting operation. 2. There are a certain number of types in multi storied forests differing selection cutting operation, regeneration operation, species, diameter distribution,stand volume and so on. Therefore, multi storied forests in the Kitayama River Basin are thought not to be made by a systematized forest operation. It is consider that cuttings of merchantable trees formed multi storied forests. 3. A desirable forest structure of multi storied forest is as follows : i) About 850 dominant trees per hectare. ii) The ratio of Hinoki(Chamaecyparis obtusa S. et Z.) to Sugi(Cryptomeria japonica D.Don) is nine to one. iii) Stand volume of dominant trees is about 400 cubic meter per hectare. iv) The proportion of volume by diameter classes shows 50% in large class, 30% in middle class and 20% in small class. 4. Results of survey in 1987 are as follows : i) There was a linear relationship between D.B.H. and the diameter of crown in the upper story. ii) There was a linear relationship between height and the diameter of crown in the lower story. iii) A straight line showed good level of fit to the diameter-height relationships, and slope of the straight line was steeper in lower story.