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.
1- Bibalani, G, 2001. Protective role of forest and non forest species. PhD Thesis. Islamic Azad University, Tehran, Iran. 149 p.
2- Abernethy, B., & IAN D. Rutherfurd. 2000. The effect of riparian tree roots on the mass- stability of riverbanks. Earth Surf. Process. Landforms 25: 921- 937.
3- Bischetti, G.B., Chiaradia. E.A., Simonato. T., Speziali. B., Vitali. B., Vullo. P., &
Antonio Zocco. 2005. Root strength and root area ratio of forest species in Lombardy (Northern Italy). Plant and Soil: 278:11–22.
4- Burke, M.K., & Raynal, D.J. 1994. Fine root growth phenology, production and turnover in a northern hardwood forest ecosystem. Plant Soil 162, 135–146.
5- Burroughs, E.R., & Thomas, B.R. 1977. Declining root strength in Douglas-fir after felling as a factor in slope stability USDA Forest Service Research Paper INT-190, 27 p.
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7- Danjon, F., Bert, D., Godin, C. & Trichet, P. 1999. Structural root architecture of 5-year- old Pinus pinaster measured by 3D digitising and analysed with AMAPmod. Plant Soil 217, 49–63.
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!" # $% &'( ) $&'(
*+
,- $ / 0 $ /+12
"34 $ +
5
*6
*/
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Investigation of Biotechnical Properties of Parottia persica in Order to Use in Bioengineering
(Case Study: Patom district of Kheyrud Forest)
E. Abdi*1, B. Majnounian2, H. Rahimi3, M. Zobeiri4 and Gh. Habibi Bibalani5
1 Assistant Professor, Faculty of Natural Resources, University of Tehran, Karaj, I. R. Iran
2 Associate Professor, Faculty of Natural Resources, University of Tehran, Karaj, I. R. Iran
3 Professor, Faculty of Soil and Water Engineering, University of Tehran, Karaj, I. R. Iran
4Professor, Faculty of Natural Resources, University of Tehran, Karaj, I. R. Iran
3 Associate Professor, Islamic Azad University of Shabestar, Shabestar, I.R. Iran (Received: 13 October 2008, Accepted: 27 January 2009)
Abstract
Vegetation is known to increase hillslope stability by reinforcing soil shear resistance. This reinforcement depends on the density and tensile strength of the root systems. This paper presents the results of research carried out in order to evaluate the biotechnical characteristics of the root system of Parrotia Persica. The profile trenching methods was used to obtaining root area ratio (RAR) and number of roots in each depth and RAR and numbers were counted. Single root specimens were sampled and tested for tensile strength measurement. The findings indicated that the general behavior of root density and number of roots is to decrease with depth. Maximum RAR values and number of roots were located within the first 0.1 m, with maximum rooting depth at about 0.60 m. In general root tensile strength tends to decrease with diameter according to a power law, with an average of 29.34±1.5 MPa. The resulting data have been used to calculate the reinforcing effect in terms of increased shear strength of the soil. The results show that root reinforcement exerted by Parrotia Persica is about 44.90 kPa in upper layers and 1.65 kPa in deeper horizons. The results presented in this paper can be used in practical bioengineering.
Keywords: Biotechnical, Root Area Ratio, Root tensile strength, Shear strength, Soil reinforcement, Bioengineering
*Corresponding author: Tel: +98261-2249312 , Fax: +98261-2249312 , E-mail: [email protected]
