2022 Fiscal Year Final Research Report
| Project/Area Number |
19K06284
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 41030:Rural environmental engineering and planning-related
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| Research Institution | Obihiro University of Agriculture and Veterinary Medicine |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Keywords | 法面保全 / 寒冷少雪地域 / 草本植物根系 / せん断特性 / 粘着力ｃ / せん断抵抗角Φ / 凍結融解時期 / 緑化工技術 |
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| Outline of Final Research Achievements |
Direct shear tests were made on soil specimens including several types of herbaceous roots for vegetation work in the cold region with less snow, strength parameters (cohesion c and angle of shear resistance φ) were aging evaluated. As the result, in the case that some herbaceous plants grew in proper time for revegetation, the ⊿ｃ (ｃ value increases) and the ⊿φ (φ value increases) on soil specimens including roots of herbaceous plants were suppressed the decreases of shear resistance force caused by the condition with high water content of soil surface. In addition, in the case that the plants grew before limit time for revegetation, the ⊿ｃ on soil specimens including roots was larger compared with those in the former year before winter season. The results showed that the seed and nodal roots increased the cohesion ｃ of the slope surface soil. Furthermore, the binding force of the surface soil due to the development of lateral roots increased the angle of shear resistance φ.
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| Free Research Field |
農業農村工学
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| Academic Significance and Societal Importance of the Research Achievements |
寒冷少雪の北海道十勝地域において植生工を用いて法面を保全するには，施工適期内に草本植物の茎葉部の生育のみならず根系を伸長・発達させておく必要がある。このことは，冬期間を経て翌春の凍結融解時期に頻発する法面表層崩壊の抑制につながる。また，生態系・種・遺伝子レベルでの生物多様性保全に配慮した法面緑化が求められる中，外来草本植物に加えて北海道原産の自生種植物（地域性種苗）の植生工への適用が求められる。こうした，植生工への地域性種苗の適用に向けた技術を確立するための今回の研究成果は，防災・減災，国土強靭化と生物多様性保全との両立を考える上で学術的・社会的意義は大きい。
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