1993 Fiscal Year Final Research Report Summary
Development of reinforcement work for forest revegetation on steep slopes
| Project/Area Number |
03556020
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
林学
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| Research Institution | Tokyo University of Agriculture and Technology |
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Principal Investigator |
TSUKAMOTO Yoshinori Tokyo Univ.of Agric.& Tech.Dept.on Environmental Science and Ntural Resources Prof., 農学部, 教授 (60014924)
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| Co-Investigator(Kenkyū-buntansha) |
FUKUNAGA Kenji Tokyo Univ.of Agric.Dept.of Forestry Assist.Prof., 農学部, 助手 (30147475)
YAMADERA Yoshinari Tokyo Univ.of Agric.Dept.of Forestry Assoc.Prof., 農学部, 助教授 (60078144)
KUBOTA Jumpei Tokyo Univ.of Agric.& Tech.Dept.on Env.Sci.& Nat.Resour.Assist.Prof., 農学部, 助手 (90195503)
MINEMATSU Hirohiko Tokyo Univ.of Agric.& Tech.Dept.on Env.Sci.& Nat.Resour.Assoc.Prof., 農学部, 助教授 (60011988)
NAKAMURA Hiroyuki Tokyo Univ.of Agric.& Tech.Dept.on Env.Sci.& Nat.Resour.Prof., 農学部, 教授 (90242239)
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| Project Period (FY) |
1991 – 1993
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| Keywords | Tree Root / Steep Slope / Forest / Reinforcement Effect / Modeling of Tree Root / Theoretical Analysis |
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| Research Abstract |
This research addresses the role of forest roots for securing and reinforcing slope stability for the purpose of developing proper reinforcement work for revegetating forest on steep slopes. The results of this study are as follows ;
1) Field observation and modeling of root distribution
The effects of root distribution for slope stability are considered as the combination of lateral and vertical roots. The lateral roots protect soil surface from surface erosion like casting "nets" over soil surface. On the other hand, vertical roots reinforce slope stability like driving "short anchors" into grounds. The difference of root distribution between trees and grasses is that tree root grow toward upper slope.
2) Theoretical analysis on effects of tree roots for slope stability
The effects of tree roots for reinforcing slope stability are investigated theoretically and are evaluated quantitatively as compared with other artificial materials, like iron stakes, pipes and anchors. Tree roots have ideal morphology as reinforcing material. But there are some limitations. One is the shortage of strength as material itself. Also Tree roots are not strong enough to penetrate into firm soils. Slope stability decreases gradually along with plant growth.
3) A guide of reinforcement work for revegetating forests on steep slopes
It is obvious that tree roots have significant effects on slope stability, but there are some limitations. The combination of natural tree roots and other artificial materials are strongly advised. The method presented in this study evaluating reinforcing effects theoretically should be useful for designing proper work.
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