| |
DOI: | 10.2136/sssaj1982.03615995004600050002x |
Web URL(s): | https://dl.sciencesocieties.org/publications/sssaj/pdfs/46/5/SS0460050894 Last checked: 11/11/2016 Requires: PDF Reader Access conditions: Item is within a limited-access website |
Publication Type:
| Refereed |
Author(s): | Waldron, L. J.;
Dakessian, S. |
Author Affiliation: | Waldron: Associate Professor, Soil Physics; Dakessian: Former Research Assistant, Dep. of Plant and Soil Biology, Univ. of California, Berkeley, CA |
Title: | Effect of grass, legume, and tree roots on soil shearing resistance |
Source: | Soil Science Society of America Journal. Vol. 46, No. 5, September/October 1982, p. 894-899. |
Publishing Information: | Madison, Wisconsin: Soil Science Society of America |
# of Pages: | 6 |
Related Web URL: | https://dl.sciencesocieties.org/publications/sssaj/abstracts/46/5/SS0460050894 Last checked: 11/10/2016 Access conditions: Item is within a limited-access website Notes: Abstract only |
Keywords: | TIC Keywords: Cultivar evaluation; Erosion control; Legumes; Root analysis; Root strength; Root systems; Shear resistance; Soil stabilization
|
Abstract/Contents: | "Plants enhance soil stability against downslope mass movement through the removal of soil water by transpiration and by the mechanical reinforcement of their roots. To assess the magnitude of this reinforcement, direct shear measurements were made on 0.25-m diam cylindrical soil columns packed both homogeneously and in layers which simulated water and/or root-impeding horizons. In all cases the matric potential was adjusted to zero before shearing. Twelve plant species were used including seven grasses: Phalaris tuberosa, Lolium rigidium, Dactylis glomerata, Bromus mollis, Sorgum bicolor sudanense, Triticum oestivum, Hordeum vulgare. Two legumes were used: Vicia dascarpa, Medicago sativa. and two trees were used: Pinus ponderosa and Quercus agrifolia. The ratio of the shear resistance at 25-mm displacement of the rooted and unrooted specimens was used as a measure of root reinforcement. Roots of several grasses planted in early fall and sheared the following spring gave about a threefold increase in shear resistance at the 0.3-m depth in homogeneous saturated clay loam. In the same material, roots of oak produced a similar increase only after 3 years' growth. One-year-old alfalfa produced a fourfold increase. At the 0.45-m depth at the interface between soil and a dense gravel-sand mixture simulating weathered rock, yellow pine gave a 1.5-fold increase after 16 months and a 2.5-fold increase after 52 months. Hardinggrass was almost equally effective after only 7 months. In almost all cases where roots increased soil shear resistance, the resistance continued to increase beyond 25-mm displacement so that the selection of 25-mm displacement was conservative, i.e., it may underestimate the root reinforcing effect. Factor of safety calculations for shallow planar slides using measured shear strengths show that plant roots can make large increases in slope stability." |
Language: | English |
References: | 19 |
Note: | Equations Figures Tables Graphs |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): Waldron, L. J., and S. Dakessian. 1982. Effect of grass, legume, and tree roots on soil shearing resistance. Soil Science Society of America Journal. 46(5):p. 894-899. |
| Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=231521 |
| If there are problems with this record, send us feedback about record 231521. |
| Choices for finding the above item: |
| DOI: 10.2136/sssaj1982.03615995004600050002x |
| Web URL(s): https://dl.sciencesocieties.org/publications/sssaj/pdfs/46/5/SS0460050894 Last checked: 11/11/2016 Requires: PDF Reader Access conditions: Item is within a limited-access website |
| MSU catalog number: b2199342a |
| Find from within TIC: Digitally in TIC by record number. |
| Request through your local library's inter-library loan service (bring or send a copy of this TGIF record) |