Positive Studies on Development of Forest Management by Thinning -Mappiong of Thinning by Sequential Aerial Photographs and Stand Structure-
Project/Area Number |
02806030
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Research Category |
Grant-in-Aid for General Scientific Research (C)
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Allocation Type | Single-year Grants |
Research Field |
林学
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Research Institution | Tottri University |
Principal Investigator |
UOZUMI Yuji Tottori University, Faculty of Agriculture Associate Professor, 農学部, 助教授 (30032105)
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Project Period (FY) |
1990 – 1991
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Project Status |
Completed (Fiscal Year 1991)
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Budget Amount *help |
¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1991: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1990: ¥1,300,000 (Direct Cost: ¥1,300,000)
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Keywords | Thinning / Aerial photograph / Crown closure / History of thining |
Research Abstract |
1)About 40 percent(10.22 million ha.)of Japanese forest is plantations. The thinning is essential to them. But they are not completely thinned because of the shortage of labor forces and the low price of woods in Japan. It will be impossible for us to use forests not only economically but environmentally without sufficient thinning. Therefore it is important to observe thinings, but it is impossible to do research of every thinning in the vast forest on the ground. 2)In Japan, aerial photographs have been successively taken about every five years in all parts of the country. 3)New micro dot grid is useful to the research of thinning by the aerial photographs. The new design which has a dot of 0.1 mm. in diameter, an interval of 0.3 mm between center of dots and red color printed on glass is best to interpret the thinning under mirror stereoscope with a six-power binocular. 4)Almost of crown closures on the photos after the thinning are smaller than before thinning. 5)A large forest which have many thinned stands was mapped. 6)By the use of several aerial photographs which were taken sequentially on same stand, we can know its history of thinings on the stand. 7)It would be also possible that this new technique monitors the multistoried stand and thinned volum in stand by aerial photographs.
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Report
(3 results)
Research Products
(10 results)