Abstract
Plant roots positively and negatively contribute to hillslope stability by the perspective of soil strength and water flow infiltration improvement. To further examine the controversy, this work addresses the six root architecture types on the rainfall threshold for slope stability by tests of saturated conductivity and shear strength of the root-soil composite. An infinite slope model and a 1D flow model combine to obtain the rainfall intensity-duration threshold of slope failure. The results reveal that the saturated hydraulic conductivity of root-soil composite is 1 to 4.23 times of bare soil, which increases as the length density, volume density, and volume fractal dimension of plant roots. Furthermore, plant roots can enhance the cohesion and angle of internal friction by 35.19–81.79% and 12.92–42.36%, respectively. Finally, the R-type and V-type roots have the most effective root architecture for hillslope stability. In the process of afforestation, H-type may be suitable for areas with soft slope, while V-type and R-type may be suitable for steep slopes. The results of this work present an interesting study on the interaction of plant roots on slope stability, which is worthy of further study in the future.
References
Abraham MT, Pothuraju D, Satyam N (2019) Rainfall thresholds for prediction of landslides in Idukki, India: an empirical approach. Water 11:2113
Alessio P (2019) Spatial variability of saturated hydraulic conductivity and measurement-based intensity-duration thresholds for slope stability, Santa Ynez Valley, CA. Geomorphology 342:103–116
Arnone E, Caracciolo D, Noto LV, Preti F, Bras RL (2016) Modeling the hydrological and mechanical effect of roots on shallow landslides. Water Resour Res 52(11):8590–8612
Asch TWJV, Buma J, Beek LPHV (1999) A view on some hydrological triggering systems in landslides. Geomorphology 30(1):25–32
Baum RL, Godt JW, Savage WZ (2010) Estimating the timing and location of shallow rainfall-induced landslides using a model for transient, unsaturated infiltration. Journal of Geophysical Research: Earth Surface 115(F3):1–26
Berti M, Martina MLV, Franceschini S, Pignone S, Simoni A, Pizziolo M (2012) Probabilistic rainfall thresholds for landslide occurrence using a Bayesian approach. Journal of Geophysical Research: Earth Surface 117:1–20
Bodner G, Leitner D, Kaul HP (2014) Coarse and fine root plants affect pore size distributions differently. Plant Soil 380(1–2):133–151
Bordoni M, Meisina C, Vercesi A, Bischetti GB, Chiaradia EA, Vergani C, Chersicha S, Valentinoe R, Bittellif M, Comollig R, Persichilloa MG, Cislaghic A (2016) Quantifying the contribution of grapevine roots to soil mechanical reinforcement in an area susceptible to shallow landslides. Soil Tillage Res 163:195–206
Brunetti MT, Peruccacci S, Rossi M, Luciani S, Valigi D, Guzzetti F (2010) Rainfall thresholds for the possible occurrence of landslides in Italy. Natural Hazards and Earth System Science 10(3):447–458
Buol SW, Southhard RJ, Graham RC, McDaniel PA (2003) Soil genesis and classification 5th edition. Iowa State University Pess-Blackwell, Ames, IA
Burylo M, Hudek C, Rey F (2011) Soil reinforcement by the roots of six dominant species on eroded mountainous marly slopes (Southern Alps, France). Catena 84(1):70–78
Caine N (1980) The rainfall intensity-duration control of shallow landslides and debris flows. Geografiska Annaler. Series A, Physical Geography 62(1–2):23–27
Chae BG, Lee JH, Park HJ, Choi J (2015) A method for predicting the factor of safety of an infinite slope based on the depth ratio of the wetting front induced by rainfall infiltration. Natural Hazards & Earth System Sciences 15(8):1835–1849
Coe JA, Kean JW, Godt JW, Baum RL, Jones ES, Gochis DJ, Anderson GS (2014) New insights into debris-flow hazards from an extraordinary event in the Colorado Front Range. Geology 24(10):4–10
Collison AJC, Anderson MG (1996) Using a combined slope hydrology/stability model to identify suitable conditions for landslide prevention by vegetation in the humid tropics. Earth Surf Process Landf 21:737–747
Danjon F, Barker DH, Drexhage M, Stokes A (2008) Using three-dimensional plant root architecture in models of shallow-slope stability. Ann Bot 101(8):1281–1293
Ebel BA, Rengers FK, Tucker GE (2015) Aspect-dependent soil saturation and insight into debris-flow initiation during extreme rainfall in the Colorado Front Range. Geology 43(8):659–662
Fan CC, Chen YW (2010) The effect of root architecture on the shearing resistance of root-soil composites. Ecol Eng 36(6):813–826
Fan CC, Tsai MH (2016) Spatial distribution of plant root forces in root-permeated soils subject to shear. Soil Tillage Res 156:1–15
Gabet EJ, Mudd SM (2006) The mobilization of debris flows from shallow landslides. Geomorphology 74:207–218
Garg A, Coo JL, Ng CWW (2015) Field study on influence of root characteristics on soil suction distribution in slopes vegetated with Cynodon dactylon and Schefflera heptaphylla. Earth Surf Process Landf 40(12):1631–1643
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
Ghestem M, Veylon G, Bernard A, Vanel Q, Stokes A (2014) Influence of plant root system morphology and architectural traits on soil shear resistance. Plant Soil 377(1–2):43–61
Godt JW, McKenna JP (2008) Hydrological response of hillside materials to infiltration: implications for shallow landsliding in the Seattle area. Landslides and engineering geology of the Seattle, Washington, area, Reviews in Engineering Geology 20:121–135
Guo WZ, Chen ZX, Wang WL, Gao WW, Guo MM, Kang HL, Li PF, Wang WX, Zhao M (2020) Telling a different story: the promote role of vegetation in the initiation of shallow landslides during rainfall on the Chinese Loess Plateau. Geomorphology 350:106879
Guzzetti F, Peruccacci S, Rossi M, Stark CP (2007) Rainfall thresholds for the initiation of landslides in central and southern Europe. Meteorog Atmos Phys 98(3–4):239–267
Huang J, WU PT, Zhao XN (2012) Effects of rainfall intensity underlying surface and slope gradient on soil infiltration under simulated rainfall experiments. Catena 104:93–102
Iverson RM (2000) Landslide triggering by rain infiltration. Water Resour Res 36(7):1897–1910
Khalilnejad A, Ali FH, Osman N (2012) Contribution of the root to slope stability. Geotech Geol Eng 30(2):277–288
Kuriakose SL, van Westen C, Lakhera RC, van Beek LPH, Sankar G, Alkema D, van Asch TWJ, Jayadev SK (2006) Effect of vegetation on debris flow initiation: conceptualization and parameterization of a dynamic model for debris flow initiation in Tikovil river basin, Kerala, India, using PCRaster. In Proceedings of the 2nd international symposium on Geo-Information for disaster management Gi4DM: remote sensing and GIS techniques for monitoring and prediction of disasters, 25–26 September, 2006, Goa, India. 6 p. Goa, India
Larsen MC, Simon A (1993) A rainfall intensity-duration threshold for landslides in a humid-tropical environment, Puerto Rico. Geografiska Annaler: Series A, Physical Geography 75(1–2):13–23
Leung AK, Garg A, Coo JL, Ng CWW, Hau BCH (2015) Effects of the roots of Cynodon dactylon and Schefflera heptaphylla on water infiltration rate and soil hydraulic conductivity. Hydrol Process 29(15):3342–3354
Leung AK, Boldrin D, Liang T, Wu ZY, Kamchoom V, Bengough AG (2017) Plant age effects on soil infiltration rate during early plant establishment. Géotechnique 68(7):646–652
Li YP, Wang YQ, Ma C, Zhang HL, Wang YJ, Song SS, Zhu JQ (2016) Influence of the spatial layout of plant roots on slope stability. Ecol Eng 91:477–486
Li YP, Wang YQ, Wang YJ, Ma C (2017) Effects of root spatial distribution on the elastic-plastic properties of soil-root blocks. Sci Rep 7(1):1–11
Liao CZ, Yu XH (2001) Application of fractal theory on studies of the root structure of plant. Acta Agric Univ Jiangxiensis 23(2):192–196. (in Chinese)
Lu N, Godt J (2008) Infinite-slope stability under steady unsaturated conditions. Water Resour Res 44(11):1–13
Ma C, Wang YJ, Du C, Wang YQ, Li YP (2016) Variation in initiation condition of debris flows in the mountain regions surrounding Beijing. Geomorphology 273:323–334
Ma C, Deng JY, Wang R (2018a) Analysis of the triggering conditions and erosion of a runoff-triggered debris flow in Miyun County, Beijing, China. Landslides 15:2475–2485
Ma ZQ, Guo DL, Xu XL, Lu MZ, Bardgett RD, Eissenstat DM, McCormack ML, Hedin LO (2018b) Evolutionary history resolves global organization of root functional traits. Nature 555(7694):94–97
Mathew J, Babu DG, Kundu S, Kumar KV, Pant CC (2014) Integrating intensity-duration-based rainfall threshold and antecedent rainfall-based probability estimate towards generating early warning for rainfall-induced landslides in parts of the Garhwal Himalaya, India. Landslides 11(4):575–588
McGuire LA, Rengers FK, Kean JW, Coe JA, Mirus BB, Baum RL, Godt JW (2016) Elucidating the role of vegetation in the initiation of rainfall-induced shallow landslides: insights from an extreme rainfall event in the Colorado front range. Geophys Res Lett 43(17):9084–9092
Merrill SD, Upchurch DR (1994) Converting root numbers observed at minirhizotrons to equivalent root length density. Soil Sci Soc Am J 58(4):1061–1067
Montgomery DR, Schmidt KM, Dietrich WE, Mckean J (2009) Instrumental record of debris flow initiation during natural rainfall: implications for modeling slope stability. Journal of Geophysical Research: Earth Surface 114(F1):1–16
Muntohar AS, Liao HJ (2010) Rainfall infiltration: infinite slope model for landslides triggering by rainstorm. Nat Hazards 54(3):967–984
Nespoulous J, Merino-Martin L, Monnier Y, Bouchet DC, Ramel M, Dombey R, Viennois G, Mao Z, Zhang JL, Cao KF, Le Bissonnais Y, Sidle RC, Stokes A (2019) Tropical forest structure and understorey determine subsurface flow through biopores formed by plant roots. Catena 181:104061
Operstein V, Frydman S (2000) The influence of vegetation on soil strength. Proceedings of the Institution of Civil Engineers-Ground Improvement 4(2):81–89
Pennington C, Dijkstra T, Lark M, Dashwood C, Freeborough K (2014) Antecedent precipitation as a potential proxy for landslide incidence in South West United Kingdom. Landslide Science for a Safer Geoenvironment 253–259
Peres DJ, Cancelliere A, Greco R, Bogaard TA (2017) Influence of uncertain identification of triggering rainfall on the assessment of landslide early warning thresholds. Natural Hazards and Earth System Sciences Discussions 18:633–646
Pollen-Bankhead N, Simon A (2010) Hydrologic and hydraulic effects of riparian root networks on streambank stability: is mechanical root-reinforcement the whole story? Geomorphology 116(3–4):353–362
Rahardjo H, Satyanaga A, Leong EC, Santoso VA, Ng YS (2014) Performance of an instrumented slope covered with shrubs and deep-rooted grass. Soils Found 54(3):417–425
Rengers FK, McGuire LA, Coe JA, Kean JW, Baum RL, Staley DM, Godt JW (2016) The influence of vegetation on debris-flow initiation during extreme rainfall in the northern Colorado Front Range. Geology 44(10):823–826
Reubens B, Poesen J, Danjon F, Geudens G, Muys B (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
Reynolds WD, Elrick DE, Youngs EG, Amoozegar A, Booltink HWG, Bouma J (2002) Saturated and field-saturated water flow parameters. In: Dane JH, Topp GC (eds) Methods of soil analysis, part 4. Soil Science Society of America, Inc., Madison, pp 797–878
Sanchez-Castillo L, Kubota T, Cantu-Silva I (2017) Influence of root reinforcement of forest species on the slope stability of Sierra Madre oriental, Mexico. J Fac Agric Kyushu Univ 62(1):177–181
Schmidt KM, Roering JJ, Stock JD, Dietrich WE, Montgomery DR, Schaub T (2001) The variability of root cohesion as an influence on shallow landslide susceptibility in the Oregon Coast Range. Can Geotech J 38(5):995–1024
Segoni S, Rossi G, Rosi A, Catani F (2014) Landslides triggered by rainfall: a semi-automated procedure to define consistent intensity-duration thresholds. Comput Geosci 63(63):123–131
Segoni S, Piciullo L, Gariano SL (2018) A review of the recent literature on rainfall thresholds for landslide occurrence. Landslides 15:1483–1501
Sidle RC, Ziegler AD, Negishi JN, Nik AR, Siew R, Turkelboom F (2006) Erosion processes in steep terrain—truths, myths, and uncertainties related to forest management in Southeast Asia. For Ecol Manag 224(1–2):199–225
Sidle RC, Gomi T, Usuga JCL, Jarihani B (2017) Hydrogeomorphic processes and scaling issues in the continuum from soil pedons to catchments. Earth Sci Rev 175:75–96
Simon A, Collison AJ (2002) Quantifying the mechanical and hydrologic effects of riparian vegetation on streambank stability. Earth Surf Process Landf 27(5):527–546
Teerawattanasuk C, Maneecharoen J, Bergado DT, Voottipruex P, Le GL (2014) Root strength measurements of vetiver and ruzi grasses. Lowland Technology International 16(2):71–80
Wang GL, Zhou SL, Zhao QG (2005) Volume fractal dimension of soil particles and its applications to land use. Acta Pedol Sin 42(4):545–550 (in Chinese)
Wieczorek G, Thomas G (2010) Climatic factors influencing occurrence of debris flow. In: Jakob M, Hungr O (eds) Debris-flow hazards and related phenomena, 1st edn. Springer-Praxis, Berlin
Wilde SA (1958) Forest soils: their protection and relation to silviculture. Ronald, New York
Wilson RC, Wieczorek GF (1995) Rainfall thresholds for the initiation of debris flows at La Honda, California. Environ Eng Geosci 1(1):11–27
Wu GL, Yang Z, Cui Z, Liu Y, Fang NF, Shi ZH (2016) Mixed artificial grasslands with more roots improved mine soil infiltration capacity. J Hydrol 535:54–60
Wynn TM, Mostaghimi S, Burger JA, Harpold AA, Henderson MB, Henry LA (2004) Variation in root density along stream banks. J Environ Qual 33(6):2030–2039
Xia ZY, Zhou ZJ, Huang XL, Xu WN (2011) Preliminary study of relationship between shallow soil reinforcement and fractal characteristics of vegetation roots in biotechnical slope protection. Chin J Rock Mech Eng 30(S2):3641–3647 (in Chinese)
Yen CP (1987) Tree root patterns and erosion control. In: Jantawat S (ed) Proceedings of the International Workshop on Soil Erosion and its Countermeasures. Bangkok, Soil and Water Conservation Society of Thailand, pp 92–111
Zhao YY (2011) Structure of water conservation forest and its regulatory mechanism on ecological functions in Jinyun Mountain. Beijing Forestry University, Southwestern China (in Chinese)
Zimmermann A, Schinn DS, Francke T, Elsenbeer H, Zimmermann B (2013) Uncovering patterns of near-surface saturated hydraulic conductivity in an overland flow-controlled landscape. Geoderma 195:1–11
Acknowledgments
The authors acknowledge three anonymous reviewers of this paper for their detailed remarks and helpful suggestions. Besides, the authors also appreciate the help from my colleagues during shear stress and saturated hydraulic conductivity tests.
Funding
This study was supported by the National Key Research and Development Program of China (No. 2017YFC0505602), the National Natural Science Foundation of China (No.31971726), and the Fundamental Research Funds for the Central Universities of Beijing Forestry University (No. 2018BLCB03).
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Wang, X., Ma, C., Wang, Y. et al. Effect of root architecture on rainfall threshold for slope stability: variabilities in saturated hydraulic conductivity and strength of root-soil composite. Landslides 17, 1965–1977 (2020). https://doi.org/10.1007/s10346-020-01422-6
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DOI: https://doi.org/10.1007/s10346-020-01422-6