| Research Articles |
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| Vertical root distribution and root cohesion of typical tree species on the Loess Plateau, China |
| ChaoBo ZHANG1, LiHua CHEN2, Jing JIANG1 |
1 College of Water Resources Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2 Key Laboratory of Soil and Water Conservation and Combating Desertification of Ministry of Education of China, School of Water and Soil Conservation, Beijing Forestry University, Beijing 100083, China |
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Abstract Black locust (Robinia pseudoacacia L.) and Chinese pine (Pinus tabulaeformis Carr.) are two woody plants that are widely planted on the Loess Plateau for controlling soil erosion and land desertification. In this study, we conducted an excavation experiment in 2008 to investigate the overall vertical root distribution characteristics of black locust and Chinese pine. We also performed triaxial compression tests to evaluate the root cohesion (additional soil cohesion increased by roots) of black locust. Two types of root distribution, namely, vertical root (VR) and horizontal root (HR), were used as samples and tested under four soil water content (SWC) conditions (12.7%, 15.0%, 18.0% and 20.0%, respectively). Results showed that the root lengths of the two species were mainly concentrated in the root diameter of 5–20 mm. A comparison of root distribution between the two species indicated that the root length of black locust was significantly greater than that of Chinese pine in nearly all root diameters, although the black locust used in the comparison was 10 years younger than the Chinese pine. Root biomass was also significantly greater in black locust than in Chinese pine, particularly in the root diameters of 3–5 and 5–10 mm. These two species were both found to be deep-rooted. The triaxial compression tests showed that root cohesion was greater in the VR samples than in the HR samples. SWC was negatively related to both soil shear strength and root cohesion. These results could provide useful information on the architectural characteristics of woody root system and expand the knowledge on shallow slope stabilization and soil erosion control by plant roots on the Loess Plateau.
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Received: 13 July 2013
Published: 12 October 2014
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| Fund: The National Natural Science Foundation of China (30872067) and the Youth Foundation of Taiyuan University of Technology (2012L017, 2013T037). |
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Corresponding Authors:
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| Abdi E, Majnounian B, Rahimi H, et al. 2010. A comparison of root distribution of three hardwood species grown on a hillside in the Caspian forest, Iran. Journal of Forest Research, 15: 99–107. Abe K, Ziemer R R. 1991. Effect of tree roots on a shear zone: modeling reinforced shear strength. Canadian Journal of Forest Research, 21: 1012–1019.Abernethy B, Rutherfurd I D. 2001. The distribution and strength of riparian tree roots in relation to riverbank reinforcement. Hydrological Processes, 15: 63–79.Atkinson D. 2000. Root characteristics: Why and what to measure. In: Smit A L, Bengough A G, Engels C, et al. Root Methods: A Handbook. New York: Springer, 1–32. Bischetti G B, Chiaradia E A, Epis T, et al. 2009. Root cohesion of forest species in the Italian Alps. Plant and Soil, 324: 71–89.Campbell K A, Hawkins C D B. 2003. Paper birch and lodgepole pine root reinforcement in coarse-, medium-, and fine-textured soils. Canadian Journal of Forest Research, 33: 1580–1586. Canadell J, Jackson R B, Ehleringer J R, et al. 1996. Maximum rooting depth of vegetation types at the global scale. Oecologia, 108: 583–595.Cao Y, Zhao Z, Qu M, et al. 2006. Effects of Robinia pseudoacacia roots on deep soil moisture status. Chinese Journal of Applied Ecology, 17(5): 765–768.Coile T S. 1937. Distribution of forest tree roots in North Carolina Piedmont soils. Journal of Forestry, 35: 247–257.Danjon F, Bert D, Godin C, et al. 1999. Structural root architecture of 5-year-old Pinus pinaster measured by 3D digitising and analysed with AMAPmod. Plant and Soil, 217: 49–63.De Baets S, Poesen J, Reubens B, et al. 2008. Root tensile strength and root distribution of typical Mediterranean plant species and their contribution to soil shear strength. Plant and Soil, 305: 207–226.Dong B F, Shi H, Fu W L. 2007. Quantitative characteristics and scattering degree of different vegetation root systems in hilly regions of Loess Plateau. Chinese Journal of Ecology, 26(12): 1947–1953.Fan C C, Su C F. 2008. Role of roots in the shear strength of root-reinforced soils with high moisture content. Ecological Engineering, 33(2): 157–166.Fredlund D G, Morgenstern N R, Widger R A. 1978. The shear strength of unsaturated soils. Canadian Geotechnical Journal, 15: 313–321.Gale M R, Grigal D F. 1987. Vertical root distributions of northern tree species in relation to successional status. Canadian Journal of Forest Research, 17: 829–834.Genet M, Kokutse N, Stokes A, et al. 2008. Root reinforcement in plantations of Cryptomeria japonica D. Don: effect of tree age and stand structure on slope stability. Forest Ecology and Management, 256: 1517–1526.Gray D H, Leiser A J. 1982. Biotechnical Slope Protection and Erosion Control. New York: Van Nostrand Reinhold Company Inc., 37–100.Gray D H, Sotir R B. 1996. Biotechnical Soil Bioengineering Slope Stabilization: A Practical Guide for Erosion Control. New York: Wiley, 54–105.Greenway D. 1987. Vegetation and slope stability. In: Andersen M, Richards K. Slope Stability. New York: Wiley, 187–230.Gyssels G, Poesen J, Bochet E, et al. 2005. Impact of plant roots on the resistance of soils to erosion by water: a review. Progress in Physical Geography, 29: 189–217.Jimoh Y A. 2005. Shear strength/moisture content models for a laterite soil in Ilorin, Kwara State, Nigeria. In: Proceedings of the 16th International Conference on Soil Mechanics and Geotechnical Engineering (Vols. 1–5): Geotechnology in Harmony with the Global Environment. Osaka, Japan, 521–525.Laflen J M, Tian J, Huang C. 2000. Soil Erosion and Dryland Farming. Florida: CRC Press LLC, 736.Li P, Zhao Z, Li Z B. 2004. Vertical root distribution characters of Robinia pseudoacacia on the Loess Plateau in China. Journal of Forestry Research, 15(4): 87–92.Liu B Z, Li K R, Wang Y M, et al. 1987. Preliminary research on soil improvements in planted Robinia pseudoacacia stands. Journal of Northwest Forestry College, 2(1): 48–57.Liu X P, Chen L H, Song W F. 2006. Study on the shear strength of forest root-loess. Journal of Beijing Forestry University, 28(5): 67–72.Liu X P, Chen L H, Chen J H. 2007. Study on the distribution of root density of Robinia pseudoacacia L. and Pinus tabulaeformis Carr. Arid Zone Research, 24(5): 647–651.Livesley S J, Gregory P J, Buresh R J. 2000. Competition in tree row agroforestry systems. 1. Distribution and dynamics of fine root length and biomass. Plant and Soil, 227: 149–161.Loades K W, Bengough A G, Bransby M F, et al. 2010. Planting density influence on fibrous root reinforcement of soils. Ecological Engineering, 36: 276–284.Luo W X, Liu G Q, Li J Y, et al. 2007. Cultivation Techniques for Main Species in Northwest China. Beijing: Chinese Forestry Press, 238–245, 754–758.Mattia C, Bischetti G B, Gentile F. 2005. Biotechnical characteristics of root systems of typical Mediterranean species. Plant and Soil, 278: 23–32.Mokany K, Raison R J, Prokushkin A S. 2006. Critical analysis of root: shoot ratios in terrestrial biomes. Global Change Biology, 12: 84–96.Nilaweera N S, Nutalaya P. 1999. Role of tree roots in slope stabilisation. Bulletin of Engineering Geology and the Environment, 57: 337–342.Osman N, Barakbah S S. 2006. Parameters to predict slope stability–soil water and root profiles. Ecological Engineering, 28: 90–95.Pollen N, Simon A. 2005. Estimating the mechanical effects of riparian vegetation on stream bank stability using a fiber bundle model. Water Resource Research, 41, W07025, doi: 10.1029/2004WR003801.Pollen N. 2007. Temporal and spatial variability in root reinforcement of streambanks: accounting for soil shear strength and moisture. Catena, 69: 197–205.Reubens B, Poesen J, Danjon F, et al. 2007. The role of fine and coarse roots in shallow slope stability and soil erosion control with a focus on root system architecture: a review. Trees, 21: 385–402.Robinson D. 1991. Roots and resource fluxes in plant communities. In: Atkinson D. Plant Root Growth. Oxford: Blackwell, 103–130.Roering J J, Schmidt K M, Stock J D, et al. 2003. Shallow landsliding, root reinforcement, and the spatial distribution of trees in the Oregon Cost Range. Canadian Geotechnical Journal, 40: 237–253.Schenk H J, Jackson R B. 2002. The global biogeography of roots. Ecological Monographs, 72: 311–328.Schmidt K M, Roering J J, Stock J D, et al. 2001. The variability of root cohesion as an influence on shallow landslide susceptibility in the Oregon Coast Range. Canadian Geotechnical Journal, 38: 995–1024.Simon A, Collison A J C. 2002. Quantifying the mechanical and hydrologic effects of riparian vegetation on streambank stability. Earth Surface Processes and Landforms, 27: 527–546.Stokes A, Norris J E, van Beek L P H, et al. 2008. How vegetation reinforces the soil on slopes? In: Norris J, Stokes A, Mickovski S B, et al. Slope Stability and Erosion Control: Ecotechnological Solutions. New York: Springer, 65–118.Terzaghi K. 1936. The shear resistance of saturated soils. In: Proceedings of the First International Conference on Soil Mechanics and Foundation Engineering. Cambridge: Harvard Printing Office, 1: 54–56.Thorne C R. 1990. Effects of vegetation on riverbank erosion and stability. In: Thornes J B. Vegetation and Erosion. Chichester: John Wiley and Sons Inc., 125–143.Tosi M. 2007. Root tensile strength relationships and their slope stability implications of three shrub species in the Northern Apennines (Italy). Geomorphology, 87: 268–283.van Noordwijk M, Purnomosidhi P. 1995. Root architecture in relation to tree-soil-crop interactions and shoot pruning in agroforestry. Agroforestry Systems, 30: 161–173.Waldron L J. 1977. The shear resistance of root-permeated homogeneous and stratified soil. Soil Science Society of America Journal, 41: 843–849.Waldron L J, Dakessian S. 1981. Soil reinforcement by roots: calculation of increased soil shear resistance from root properties. Soil Science, 132: 427–435.Wu T H. 1976. Investigation of landslides on prince of wales island. In: Geotechnical Engineering Report 5. Civil Engineering Department, Ohio State University, Columbus, Ohio, USA, 94.Wu T H, McKinnell W P III, Swanston D N. 1979. Strength of tree roots and landslides on prince of Wales island, Alaska. Canadian Geotechnical Journal, 16: 19–33.Yang J H, Li H Y, Li H P, et al. 2007. Study on root distribution and impact on holding soil of four kinds of shrubbery. Journal of Soil and Water Conservation, 21(3): 48–51.Yang J W, Liang Z S, Han R L. 2006. Water use efficiency characteristics of four tree species under different soil water conditions in the Loess Plateau. Acta Ecologica Sinica, 26(2): 558–565.Yang W Z, Shao M A. 2000. Soil Water Research on the Loess Plateau. Beijing: Science Press, 127–168.Zhang C B, Chen L H, Liu Y P, et al. 2010. Triaxial compression test of soil-root composites to evaluate influence of roots on soil shear strength. Ecological Engineering, 36: 19–26.Zhao Z, Li P, Wang N J. 2000. Distribution patterns of root systems of main planting tree species in Weibei Loess Plateau. Chinese Journal of Applied Ecology, 11(1): 37–39.Zhen S X, Shangguan Z P. 2007. Photosynthetic physiological adaptabilities of Pinus tabulaeformis and Robinia pseudoacacia in the Loess Plateau. Chinese Journal of Applied Ecology, 18(1): 16–22. Zhou Z C, Shangguan Z P. 2007. Vertical distribution of fine roots in relation to soil factors in Pinus tabulaeformis Carr. forest of the Loess Plateau of China. Plant and Soil, 291: 119–129. |
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