Evaluation of Factors Affecting Water Erosion along Skid Trails


1 and R. Naghdi2

2 00

3 I. Bagheri1 and R. Naghdi2*,


Water erosion causes severe soil damage in northern forests of Iran which is associated with different rut depths in skid trails. The aim of this study was to assess rutting and soil displacement on skid trails to mitigate water erosion. Therefore the research was carried out in eight parcels of district No 3 of Shafarood Forest in the North of Iran. In order to evaluate the amount of erosion in skid trails, 30 lateral profiles in three slope classes (0-15, 15-25 and >25%) were randomly chosen from 10 skid trails. The amount of soil displaced and ruts were measured using lateral profile of skid trail. Then the effective factors on soil disturbances such as longitudinal slope, soil texture, crown canopy and forest floor cover were separately measured in the studied plots. The results of regression analysis showed that there were significant differences between amount of soil erosion and longitudinal slope, soil texture, crown canopy and forest floor cover. The results from Pearson test showed that there was significant correlation between amount of soil erosion and longitudinal slope of skid trails, soil texture and forest floor cover (?= 0.01 and ?= 0.05), but there was no significant correlation between amount of soil erosion and crown canopy. The results of this research showed that by increasing longitudinal slope of skid trail, displaced soil volume and rutting depth increased. The sample plots in longitudinal slope class of >25% and average displaced soil volume of 5.3 m3 had maximum disturbance. Mean comparison test also showed that there were no significant differences in the displaced soil volume in the two longitudinal slope classes (0-15 and 15-25%), but with an increase in longitudinal slope (more than 25%), the average displaced soil volume increased.


Billby, O. (1998) The generation and fate of road_ surface sediment in forested watersheds in southwestern Washington. Forest Science. 35(2), 453-468.
Eliasson, L. (2005) Effect of forwarder tyre pressure on rut formation and soil compaction. Silva Fennica. 39(4), 549-557.
Hartanto, H., Prabhu, R., Widayat, A.S.E. and Asdak, C. (2003) Factors affecting runoff and soil erosion: plot-level soil loss monitoring for assessing sustainability of forest management.
Forest Ecology and Management. 180(1), 361–374.
Laflen, J.M., Elliot, W.J., Simanton, J.R., Holzhey, C.S. and Kohl, K.D. (1991) WEPP soil erodibility experimentsfor rangeland and cropland soils. Journal of Soil and Water Conservation. 46, 39–44.
Larson, W.E., Pierce, F.J. and Dowdy, R.H. (1983) The threat of soil erosion to long- term crop production. Science. 219, 458-465. MacDonald, L.H., Sampson, R.W. and Anderson, D.M. (2001) Runoff and road erosion at the plot and road segment scales, ST John, Us Virgin Islands. Earth Surface Process Landforms. 26, 251-272.
Bagheri et al., 159Moore, I.D. and Burch, G.J. (1994) Topographic effects on the distribution of surface soil water and the location of ephemeral gullies. Journal of American Society of Agricultural Engineers. 31(4), 1098-1107.
Moor, D. (1992) Length- slope factors for the revised universal soil loss equation: Simplified method of estimation. Journal of Soil and Water Conservation. 47(5):423-428.
Naghdi, R., Bagheri, I. and Basiri, R. (2010) Soil disturbances due to machinery traffic on steep skid trail in the north mountainous forest of Iran. Journal of Forestry Research. 21(4), 497−502.
Naghdi, R., Bagheri, I., Lotfalian, M. and Setodeh, B. (2009) Rutting and soil displacement caused by 450C Timber Jack wheeled skidder (Asalem forest northern Iran). Journal of Forest Science.55(4), 177–183.
Najafi, A., Solgi, A. and Sadeghi, S.H. (2010) Effects of skid trail slope and ground skidding on soil disturbance. Caspian Journal of Environmental Sciences. 8 (1), 13-23.
Najafi, A., Solgi, A. and Sadeghi, S. H. (2009) Soil disturbance following four wheel rubber skidder logging on the steep trail in the north mountainous forest of Iran. Soil and Tillage Research. 103, 165–169.
Nugent, C., Kanali, C., Owende, P.M.O., Nieuwenhuis,M. and Ward, S. (2003) Characteristic site disturbancedue to harvesting and extraction machinery traffic onsensitive forest sites with peat soils. Forest Ecology andManagement. 180, 85–98.
Pinard, M., Barkeer, A. and Tay, J. (2006) Soil disturbance and post-logging forest recovery on bulldozer paths in Sabah, Malaysia. Forest Ecology and Management. 130,213-225.
Quesnal, H.J. and Curran, M.P. (2000) Shelter wood harvesting in root-disease infected stands-post-harvest soil disturbance and compaction. Forest Ecology and Management. 133, 89–113.
Rab, A., Bradshaw, J., Campbell, R. and Murphy, S. (2005) Review of Factors Affecting Disturbance, Compaction and Traffic Ability of Soils with Particular Reference to Timber Harvesting in the Forests of South-West Western Australia. Department of Conservation and Land Management, Technical Report No. 2. pp. 160.
Rab, M.A. (1996) Soil physical and hydrological properties following logging and slash burning in the Eucalyptus regnans forest of southeastern Australia. Forest Ecology and Management. 84(1-3), 159-176.
Soane, B.D. (1990) The role of organic matter in soil compatibility: a review of some practical aspects. Soil and Tillage Research. 16, 179-201.Trautner, A. and Arvidsson, J. (2003) Subsoil compaction caused by machinery traffic on a Swedish Eutric cambisol at different soil water contents. Soil and Tillage Research. 73, 107-118.
Wehner, Y. (2003) Environmental impacts of modern harvesting systems on soil new results technological assessment. 2nd Forest Engineering Conference Sweden, 154-160.
Zar, J.H. (1999) Biostatistical Analysis. New Jersey, PrenticeHall, Inc., Englewood Cliffs. pp. 620.