書誌事項
- タイトル別名
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- Resistance force of laterally spread tree roots-lateral root modeling
- ジュモク コンケイ ノ スイヘイ コン ガ ハッキ スル ダンメン テイコウリョク ノ ケイサン モデル
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抄録
Tree roots with an underground lateral network play a very important role in slope stability. Since failures occur in three dimensions, lateral roots fully demonstrate their resistance against failure. This paper describes the resistance force that Δ C lateral roots provide. Intensive field investigations and a model description were made. Since the field data show that the root strength Δ C varies considerably among the surveyed plots, predicting the Δ C from the plot information such as tree species, tree ages, slope and soil thickness can be difficult. To assist with prediction, this paper proposes a Δ C model to calculate the resistance force shown by trees of any age when it is given information about the species, forest operation history, and initial tree density. The Δ C model constitutes four components : a forest yield calculation table ; Karizumi's root volume regression curve ; a root distribution model proposed by Tsukamoto ; and a summation process of Δ C. The model highlights the importance of a particular parameter, which is the weight ratio of lateral roots to full roots. The model shows that the ratio of lateral roots directly affects the size of Δ C. By inspecting the field investigation data and the output of the Δ C model, it has been proved that the change of Δ C over time is well represented by a simple logarithmic curve which has only one coefficient multiplied by the logarithmic term itself. In comparing logarithmic curves to the output of the Δ C model, the logarithmic coefficient corresponds well to the weight ratio of lateral roots. The variance of Δ C shown by the field data is lumped into the coefficient. It has the potential to describe lateral root strength in a simple manner and could be a good index of Δ C. Also, when considering a forest thinning operation, the change in lateral root strength might easily be represented by the coefficient.
収録刊行物
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- Journal of the Japan Society of Erosion Control Engineering
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Journal of the Japan Society of Erosion Control Engineering 65 (5), 35-40, 2013
公益社団法人 砂防学会
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詳細情報 詳細情報について
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- CRID
- 1390282680456525696
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- NII論文ID
- 130005091419
- 10031141098
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- NII書誌ID
- AN0012035X
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- ISSN
- 21874654
- 02868385
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- NDL書誌ID
- 024240186
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可