The influence of cellulose content on tensile strength in tree roots

被引:332
作者
Genet, M
Stokes, A
Salin, F
Mickovski, S
Fourcaud, T
Dumail, JF
van Beek, R
机构
[1] Univ Bordeaux 1, CNRS, Lab Rheol Bois Bordeaux, Mixed Unit,INRA, F-33162 Cestas, France
[2] INRA, Equipe Genet & Ameliorat Arbres Forestiers, UMR BIOGECO, F-33162 Cestas, France
[3] AMIS, CIRAD, AMAP, F-34398 Montpellier, France
[4] Univ Dundee, Sch Engn & Phys Sci, Civil Engn Div, Dundee DD1 4HR, Scotland
[5] XYLOMECA, F-24700 Moulin Neuf, France
[6] Univ Amsterdam, Inst Biodivers & Ecosyst Dynam Phys Geog, NL-1018 WV Amsterdam, Netherlands
[7] Univ Utrecht, Dept Phys Chem, NL-3508 TC Utrecht, Netherlands
关键词
biomechanics; Castanea sativa Mill; Pinus pinaster Ait; root reinforcement; slope stability; soil fixation;
D O I
10.1007/s11104-005-8768-6
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Root tensile strength is an important factor to consider when choosing suitable species for reinforcing soil on unstable slopes. Tensile strength has been found to increase with decreasing root diameter, however, it is not known how this phenomenon occurs. We carried out tensile tests on roots 0.2-12.0 mm in diameter of three conifer and two broadleaf species, in order to determine the relationship between tensile strength and diameter. Two species, Pinus pinaster Ait. and Castanea sativa Mill., were then chosen for a quantitative analysis of root cellulose content. Cellulose is responsible for tensile strength in wood due to its microfibrillar structure. Results showed that in all species, a significant power relationship existed between tensile strength and root diameter, with a sharp increase of tensile strength in roots with a diameter < 0.9 mm. In roots > 1.0 mm, Fagus sylvatica L. was the most resistant to failure, followed by Picea abies L. and C. sativa., P. pinaster and Pinus nigra Arnold roots were the least resistant in tension for the same diameter class. Extremely high values of strength (132-201 MPa) were found in P. abies, C. sativa and P. pinaster, for the smallest roots (0.4 mm in diameter). The power relationship between tensile strength and root diameter cannot only be explained by a scaling effect typical of that found in fracture mechanics. Therefore, this relationship could be due to changes in cellulose content as the percentage of cellulose was also observed to increase with decreasing root diameter and increasing tensile strength in both P. pinaster and C. sativa.
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页码:1 / 9
页数:9
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