Abstract
The thickness of shallow landslides is generally less than 2 m, which is of the same order of magnitude as the growth range of vegetation roots. Vegetation roots can improve the stability of shallow soil through mechanical and hydraulic effects. Therefore, the landslide process is closely related to the plant roots growing on the slope surface. Plant roots play a dominant role in the regulation of soil suction through solar radiation induced transpiration. However, little is known about the correlation between cumulative solar radiation and soil suction. Moreover, the specific effects of fine roots on the suction distribution are not clear in most previous studies. In this study, a vegetated soil of a drought-tolerant and water-tolerant shrub, namely Amorpha fruticose, was adopted. The suction and volumetric water content of bare and vegetated soils were monitored under natural conditions for 4 months. The results demonstrate that there is a nearly linear relationship between cumulative solar radiation and suction ranging from zero to 100 kPa. Regarding the modeling of the soil-plant-atmosphere interactions, this relationship could serve a significant role in calculating the root water uptake under given solar radiation conditions. In addition, higher suctions were observed at the lower layer of the vegetated soil than those at the middle layer, which is different from the results of vegetated soil from previous investigations. This is due to the fact that the root area index (RAI) of fine roots at the lower layer is twice that of the middle layer. Importantly, the higher concentration of fine roots at the lower layer of vegetated soil sample resembles the root distribution of shrub near the soil-bedrock interface on shallow bedrock landslides. The fine roots would increase soil suction through transpiration, and hence reduce the permeability and increase shear strength of landslides. Eventually, these new findings serve as a preliminary step on the evaluation of the stability of this common type of landslides.
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References
Allen RG, Pereira LS, Raes D, et al. (1998) Crop evapotranspiration. Guidelines for Computing Crop Water Requirements. Irrigation and Drainage Paper 56. FAO, Rome, Italy. pp 1–3.
ASTM (2017) Standard practice for classification of soils for engineering purposes (Unified Soil Classification System). ASTM standard D 2487-17. West Conshohocken, USA. https://doi.org/10.1520/D2487-17
Baille M, Baille A, Laury JC (1994) A simplified model for predicting evapotranspiration rate of nine ornamental species vs. climate factors and leaf area. Sci Hortic 59(3–4): 217–232. https://doi.org/10.1016/0304-4238(94)90015-9
Bodner G, Leitner D, Kaul HP (2014) Coarse and fine root plants affect pore size distributions differently. Plant Soil 380(1–2): 133–151. https://doi.org/10.1007/s11104-014-2079-8
Croissant T, Steer P, Lague D, et al. (2019) Seismic cycles, earthquakes, landslides and sediment fluxes: linking tectonics to surface processes using a reduced-complexity model. Geomorphology 339(12): 87–103. https://doi.org/10.1016/j.geomorph.2019.04.017
Feddes RA, Kowalik PJ, Zaradny H (1978) Simulation of Field Water Use and Crop Yield. Centre for Agricultural Publishing and Documentation.
Feng S, Liu HW, Ng CWW (2020) Analytical analysis of the mechanical and hydrological effects of vegetation on shallow slope stability. Comput Geotech 118. https://doi.org/10.1016/j.compgeo.2019.103335
Ghestem M, Sidle RC, Stokes A (2011) The influence of plant root systems on subsurface flow: Implications for slope stability. BioScience 61(11): 869–879. https://doi.org/10.1525/bio.2011.61.11.6
Grayston SJ, Vaughan D, Jones D (1997) Rhizosphere carbon flow in trees, in comparison with annual plants: the importance of root exudation and its impact on microbial activity and nutrient availability. Appl Soil Ecol 5(1): 29–56. https://doi.org/10.1016/s0929-1393(96)00126-6
Greenway DR (1987) In: Richards MG (ed) Slope stability: geotechnical engineering and geomorphology. Vegetation and slope stability. pp 187–230.
Haseba T, Takechi O (1972) Studies of transpiration in relation to the environment. J Agric Meteorol 28(2): 93–101. https://doi.org/10.2480/agrmet.28.93
Indraratna B, Fatahi B, Khabbaz H (2006) Numerical analysis of matric suction effects of tree roots. P I Civil Eng-Geotec 159(2): 77–90. https://doi.org/10.1680/geng.2006.159.2.77
Jin HF, Shi DM, Zeng XY, et al. (2019) Mechanisms of root-soil reinforcement in bio-embankments of sloping farmland in the purple hilly area, China. J Mt Sci 16(10): 2285–2298. https://doi.org/10.1007/s11629-019-5476-x
Jotisankasa A, Sirirattanachat T (2017) Effects of grass roots on soil-water retention curve and permeability function. Can Geotech J 54(11): 1612–1622. https://doi.org/10.1139/cgj-2016-0281
Lin JY, Lin CH, Tsay YS (2016) A model for prediction evapotranspiration rate of wild allamanda for living wall systems. Conference: Indoor Air, Ghent, Belgium.
Liu Q, Su L, Xia Z, Liu D, et al. (2019) Effects of soil properties and illumination intensities on matric suction of vegetated soil. Sustainability 11(22). https://doi.org/10.3390/su11226475
Lu J, Zhang Q, Werner AD, et al. (2020) Root-induced changes of soil hydraulic properties–A review. J Hydrol 589(1–2). https://doi.org/10.1016/j.jhydrol.2020.125203
Mu QY, Dong H, Liao HJ, et al. (2020) Water-retention curves of loess under wetting-drying cycles. Geotech Lett 10(2): 135–140. https://doi.org/10.1680/jgele.19.00025
Mu QY, Dong H, Liao HJ, Zhou, et al. (2022) Effects of in situ wetting–drying cycles on the mechanical behaviour of an intact loess. Can Geotech J 59(7): 1281–1284. https://doi.org/10.1139/cgj-2020-0696
Ng CWW, Pang YW (2000) Experimental investigations of the soil-water characteristics of a volcanic soil. Can Geotech J 37(6): 1252–1264. https://doi.org/10.1139/cgj-37-6-1252
Ng CWW, Menzies B (2007) Advanced Unsaturated Soil Mechanics and Engineering. Taylor & Francis. CRC Press, London, UK. https://doi.org/10.1201/9781482266122
Ng CWW, Ni JJ, Leung AK, et al. (2016) Effects of planting density on tree growth and induced soil suction. Géotechnique 66(9): 711–724. https://doi.org/10.1680/jgeot.15.P.196
Ng CWW (2017) Atmosphere-plant-soil interactions: theories and mechanism. Chinese J Geotechnical Eng 39(1): 1–47. (In Chinese) https://doi.org/10.11779/CJGE201701001
Ng CWW, Sadeghi H, Jafarzadeh F, et al. (2020a) Effect of microstructure on shear strength and dilatancy of unsaturated loess at high suctions. Can Geotech J 57(2): 221–235. https://doi.org/10.1139/cgj-2018-0592
Ng CWW, Ni JJ, Leung AK (2020b) Effects of plant growth and spacing on soil hydrological changes: a field study. Géotechnique 70(10): 867–881. https://doi.org/10.1680/jgeot.18.P.207
Ng CWW, Guo HW, Ni JJ, et al. (2022a) Effects of soil-plant-biochar interactions on water retention and slope stability under various rainfall patterns. Landslides 19(6): 1379–1390. https://doi.org/10.1007/s10346-022-01874-y
Ng CWW, Zhang Q, Zhou C, et al. (2022b) Eco-geotechnics for human sustainability. Sci China Tech Sci 65: 2809–2845. https://doi.org/10.1007/s11431-022-2174-9
Ni JJ, Leung AK, Ng CWW, et al. (2018) Modelling hydromechanical reinforcements of plants to slope stability. Comput Geotech 95: 99–109. https://doi.org/10.1016/j.compgeo.2017.09.001
Ni JJ, Leung A, Ng CWW (2019) Modelling effects of root growth and decay on soil water retention and permeability. Can Geotech J 56(7): 1049–1055. https://doi.org/10.1139/cgj-2018-0402
Nyambayo VP, Potts DM (2010) Numerical simulation of evapotranspiration using a root water uptake model. Comput Geotech 37(1–2): 175–186. https://doi.org/10.1016/j.compgeo.2009.08.008
Pieruschka P, Huber G, Berry JA (2010) Control of transpiration by radiation. PNAS 107(30): 13372–7. https://doi.org/10.1073/pnas.0913177107
Pollen N, Simon A, Collison A (2004) Advances in assessing the mechanical and hydrologic effects of riparian vegetation on streambank stability. In Riparian Vegetation and Fluvial Geomorphology. pp 125–139. https://doi.org/10.1029/008wsa10
Rajamanthri K, Jotisankasa A, Aramrak S (2021) Effects of Chrysopogon zizanioides root biomass and plant age on hydro-mechanical behavior of root-permeated soils. Int J Geosynth Groun 7(2). https://doi.org/10.1007/s40891-021-00271-0
Rickli C, Graf F (2009) Effects of forests on shallow landslides - case studies in Switzerland. For Snow Landsc Res 82(1): 33–44.
Romero E, Gens A, Lloret A (1999) Water permeability, water retention and microstructure of unsaturated compacted Boom clay. Eng Geol 54(1–2): 117–127. https://doi.org/10.1016/s0013-7952(99)00067-8
van Genuchten, MT (1987) A numerical model for water and solute movement in and below the root zone. Research Report No.121. U.S. Salinity laboratory, USDA, ARS, Riverside, Calif.
Sadeghi H, Chiu AC, Ng CWW, et al. (2020) A vacuum-refilled tensiometer for deep monitoring of in-situ pore water pressure. Sci Iran 27(2): 596–606. https://doi.org/10.24200/sci.2018.5052.1063
Sadeghi H, Hossen SB, Chiu AC, et al. (2016) Water retention curves of intact and re-compacted loess at different net stresses. Jpn Geotech Soc Spec Publ 2(4): 221–225. https://doi.org/10.3208/jgssp.HKG-04
Sadeghi H, Ng CWW (2018) Shear behaviour of a desiccated loess with three different microstructures. In 7th International conference on unsaturated soils. https://doi.org/10.13140/RG.2.2.18419.17447
Scanlan CA, Hinz C (2010) Insight into the processes and effects of root induced changes to soil hydraulic properties. 19th World Congress of Soil Science, Soil Solutions for a Changing World, Brisbane, Australia, 1ߝ6 August 2010. pp 41–44.
Scholl P, Leitne D, Kammerer G, et al. (2014) Root induced changes of effective 1D hydraulic properties in a soil column. Plant Soil 381(1–2): 193–213. https://doi.org/10.1007/s11104-014-2121-x
Segal E, Kushnir T, Mualem Y, et al. (2008) Water Uptake and Hydraulics of the Root Hair Rhizosphere. Vadose Zone J 7(3): 1027–1034. https://doi.org/10.2136/vzj2007.0122
Singh DP, Turne NC, Rawson HM (1982) Effects of radiation, temperature and humidity on photosynthesis, transpiration and water use efficiency of oilseed rape (Brassica campestris L.). Biol Plantarum 24(2): 130–135. https://doi.org/10.1007/BF02902859
Soltania A, Azimib M, Deng A, et al. (2017) A simplified method for determination of the soil–water characteristic curve variables. Int J Geotech Eng 13(9): 316–325. https://doi.org/10.1080/19386362.2017.1344450
Stokes A, Atger C, Bengough AG, et al. (2009) Desirable plant root traits for protecting natural and engineered slopes against landslides. Plant Soil 324(1–2): 1–30. https://doi.org/10.1007/s11104-009-0159-y
Su LJ, Hu BL, Xie QJ, et al. (2020) Experimental and theoretical study of mechanical properties of root-soil interface for slope protection. J Mt Sci 17(11): 2784–2795. https://doi.org/10.1007/s11629-020-6077-4
Ta H, Shin JH, Ahn TI, et al. (2011) Modeling of transpiration of paprika (Capsicum annuum L.) plants based on radiation and leaf area index in soilless culture. Hortic Environ Biote 52(3): 265–269. https://doi.org/10.1007/s13580-011-0216-3
Traoré O, Groleau-Renaud, V, Plantureux S, et al. (2000) Effect of root mucilage and modelled root exudates on soil structure. Eur J Soil Sci 51(4): 575–581. https://doi.org/10.1111/j.1365-2389.2000.00348.x
Waldron LJ (1977) The Shear Resistance of Root-Permeated Homogeneous and Stratified Soil. Soil Sci Soc Am J 41(5): 843–849. https://doi.org/10.2136/sssaj1977.03615995004100050005x
Zhang CB, Liu YT, Li DR, et al. (2020) Influence of soil moisture content on pullout properties of Hippophae rhamnoides Linn. roots. J Mt Sci 17(11): 2816–2826. https://doi.org/10.1007/s11629-020-6072-9
Zhu H, Zhang LM, Garg A (2018) Investigating plant transpiration-induced soil suction affected by root morphology and root depth. Comput Geotech 103: 26–31. https://doi.org/10.1016/j.compgeo.2018.06.019
Acknowledgments
The authors acknowledge the financial supports from the National Natural Science Foundation of China (grant No. 41925030 and 4179043), the Second Tibetan Plateau Scientific Expedition and Research Program (STEP, grant No. 2019QZKK0904), and the Natural Science Foundation of Shaanxi Province (2020JQ-041). Technical support from the Yanting Agro-ecological Experiment Station of Purple Soil of Chinese Academy of Sciences is also acknowledged.
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Guo, Hq., Chen, Xq., Song, Dr. et al. Effects of solar radiation and fine roots on suction of Amorpha fruticose-vegetated soil. J. Mt. Sci. 20, 1790–1804 (2023). https://doi.org/10.1007/s11629-022-7694-x
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DOI: https://doi.org/10.1007/s11629-022-7694-x