Effects of Skid Trail Slope and Ground Skidding on Soil Disturbance

The effects of traffic frequency and skid trail slope on dry bulk density, litter mass and rutting are examined. Treatments included a combination of four different traffic frequencies (3, 7, 14, and 20 passes of a rubber skidder) and three levels of slope (<10%, 10%-20% and > 20%.) The results showed that dry bulk density, rut depth and soil displacement increased with the increase of traffic frequency and slope, but floor coverage decreased. Within each traffic treatment soil compaction raised with the increase of skid trail slope, so that significant differences in dry bulk density were observed between slope of < 20% and those one >20% . Bulk density has become quite close to the critical value after 14 cycles. With increase of the skidder cycles from 14 to 20, bulk density remained approximately constant. We observed soil displacement on the treatments with 7 cycles: rutting on the treatments started with 7 cycles and slope of >20%. Soil disturbance increased significantly on slopes with > 20 % inclination with a dry bulk density of 1100 kg m-3 after 3 cycles compared to 830 kg m-3 on slopes < 10 %. In addition the forest floor mass on the treatments with 7 cycles and slopes of >20% (437.6 kg/ha) was significantly (p<0.05) lower than treatments with 14 cycles and slopes of <10% (841.4 kg/ha.) Data suggest that disturbance increased earlier in the steep treatments than in less sloping conditions. The dramatic increase of soil disturbance on treatments with slopes of >20% may be associated with increasing load on the rear axle combined with slipping on steep slope trail.
 
REFERENCES
Alakukku, L (1996) Persistence of soil compaction due to high axle load traffic. Short-term effects on the properties of clay and organic soils. Sol & Till. Res. 3, 211-222.
Ampoorter, E., Goris, R., Cornelis, W.M. and Verheyen, K (2007) Impact of mechanized logging on compaction status of sandy forest soils. For. Eco. and Management. 241, 162-174.
Arocena, J.M (2000) Cations in solution from forest soils subjected to forest floor removal and compaction treatments. For. Eco. and Management, 133, 71-80.
Ballard, T.M (2000) Impacts of forest management on northern forest soils. For. Eco. and Management. 133, 37-42.
Bengtsson, J., Lundkvist, H., Saetre, P., Sohlenius, B. and Solbreck, B (1998) Effects of organic matter removal on the soil food web: forestry practices meet ecological theory. App. Sol. Ecology. 9, 137-143.
Brais, S. and Camire´, C (1998) Soil compaction induced by careful logging in the claybelt region of northwestern Quebec (Canada.) Can. J. Sol. Science. 78, 197-206.
Botta, G.F., Jorajuria, D., Rosatto, H. and Ferrero, C (2006) Light tractor traffic frequency on soil compaction in the Rolling Pampa region of Argentina. Soil & Tillage. Res. 86, 9-14.
Davies, D. B., Finey, J. B., & Richardson, S. J (1973) Relative effects of tractor weight and wheel-slip in causing soil compaction. J. Sol. Sci. 24, 401-409.
Demir, M., Makineci, E. and Yilmaz, E (2007) Investigation of timber harvesting impacts on herbaceous cover, forest floor and surface soil properties on skid road in an oak (Quercus petrea L.) stand. Bul and Environment. 42: 1194–1199.
Demir, M., Makineci, E. and Yilmaz, E (2007) Harvesting Impacts on Herbaceous Understory, Forest Floor and Top Soil Properties on Skid Road in a Beech (Fagus orientalis Lipsky.) Stand. J. Env. Biology, 28: 427-432.
Gomez, A., Powers, R.F., Singer, M.J. and Horwath, W.R (2002.) Soil Compaction effects on growth of young ponderosa pine following litter removal in California’s Sierra Nevada. Sol. Sci. Soc. Am. J. 66, 1334-1343.
Greacen, E.L. and Sands, R (1980) Compaction of forest soils: a review. Aus J. Sol. Res. 18, 163–189.
Hamza, M.A. and Anderson, W.k (2004) Soil compaction in cropping systems a review of the nature, causes and possible solutions. Soil & Tillage. Res. 82: 121- 145.
Heninger, R., Scott, W., Dobkowski, A., Miller, R., Anderson, H. and Duke, S (2002) Soil disturbance and 10-year growth response of coast Douglas-fir on nontilled and tilled skid trails in the Oregon Cascades. Can. J. For. Res. 32, 233-246.
Ilstedt, U., Malmer, A., Nordgren, A. and Liau, P (2004) Soil rehabilitation following tractor logging: early results on amendments and tilling in a second rotation Acacia mangium plantation in Sabah, Malaysia. For. Eco. and Management. 194, 215–222.
Johnston, F.M. and Johnston, S.W (2004) Impacts of road disturbance on soil properties and exotic plant occurrence in subalpine areas of Australian Alps. Arc Ant and Alp Res. 36: 201–207.
Jurgensen, M.F., Harvey, A.E., Graham, R.T., Page-Dumroese, D.S., Tonn, J.R., Larsen, M.J. and Jain, T.B (1997) Impacts of timber harvesting on soil organic matter, nitrogen, productivity, and health of inland northwest forests. For Sci. 43, 234–251.
Kalra, Y.P. and Maynard, D.G (1991) Methods and manual for forest soil and plant analysis. Forestry Canada, Re NOR-X-319. Northern Forestry Center.
Kolka, R.K. and Smidt, M.F (2004) Effects of forest road amelioration techniques on soil bulk density, surface runoff, sediment transport, soil moisture and seedling growth For. Eco. and Management. 202: 313-323.
Kozlowski, T.T (1999) Soil compaction and growth of woody plants. Scan J. For. Res. 14, 596–619.
Krag, R., Higgingbotham, K. and Rothwell, R (1986) Logging and soil disturbance in southeast British Columbia. Can. J. For. Res. 16, 1345–1354.
Makineci, E., Demir, M. and Yilmaz, E (2007) Long-term harvesting effects on skid road in a fir (Abies bornmulleriana Mattf.) plantation forest. Bul and Environment. 42, 1538-1543.
Makineci, E., Demit, M., Comez, A. and Yilmaz, E (2007) Effects of Timber Skidding on Chemical Characteristics of Herbaceous Cover, Forest Floor and Topsoil on Skidroad in an Oak (Quercus petrea L.) Forest. J. Ter.,  44: 423-428.
Makineci, E., Demit, M., Comez, A. and Yilmaz, E (2007) Chemical Characteristics of the Surface Soil, Herbaceous Cover and Organic Layer of a Compacted Skid Road in a Fir (Abies bornmulleriana Mattf.) Forest. Transportation Research Part D: Tra. Env. 12: 453-459.
Marshall, V.G (2000) Impacts of forest harvesting on biological processes in Northern forest soils. For. Eco. and Management 133, 43–60.
McNabb, D.H., Startsev, A.D. and Nguyen, H (2001) Soil wetness and traffic on bulk density and air-filled porosity of compacted boreal forest soils. Sol. Sci. Soc. Am. J. 65: 1238-1247.
Merinoa, A., Lo´peza, A.F. and SollaGullo´na, F. J. M (2004) Edesob Soil changes and tree growth in intensively managed. For. Eco. and Management. 196: 393–404.
Murphy, M., Firth, J.G. and Skinner, M.F (2004) Long-term impacts of forest harvesting related soil disturbance on log product yields and economic potential in a New Zealand forest. Sil Fen. 38: 279-289.
Pennington, P.I., Laffan, M., Lewis, R. and Churchill, K (2004) Impact of major snig tracks on the productivity of wet Eucalyptus obliqua forest in Tasmania measured 17–23 years after harvesting. Aus. For. J. 67: 17-24.
Pinard, M.A., Barker, M.G. and Tay, J (2000) Soil disturbance and post-logging forest recovery on bulldozer paths in Sabah, Malaysia. For. Eco. and Management. 130: 213–225.
Rab, M.A (2004) Recovery of soil physical properties from compaction and soil profile disturbance caused by logging of native forest in Victorian Central Highlands, Australia. For. Eco. and Management. 191, 329–340.
Rab, M.A (1994) Changes in physical properties of a soil associated with logging of Eucalyptus regnan forest in southeastern Australia. For. Eco. and Management. 70, 215-229.
Raghavan, G. S. V., McKyes, E., and Beaulieu, B (1977) Prediction of clay soil compaction., J. Ter. 14, 31-38.
Stone, J. E., Kolb T.E. and Covington, W.W (1999) Effects of restoration thinning on presettlement Pinus ponderosa in northern Arizona. Res. Eco. 7: 172-182.
Tan, X., Kabzem R. and Chang, S.X (2006) Response of forest vegetation and foliar δ13C and δ15N to soil compaction and forest floor removal in a boreal aspen forest. For. Eco. and Management 222: 450- 458.
Thomas, G.W., Haszler, G.R. and Blevins, R.I (1996) The effect of organic matter and tillage on maximum compactibility of soils using the proctor test. Sol Sci. 161: 502–508.
Williamson, J.R. and Neilsen, W.A. (2003) The effect of soil compaction, profile disturbance and fertilizer application on the growth of eucalyptus seedlings in two glasshouse studies. Sol & Till. Res. 71: 95–107.
Woodward, C.L. (1996) Soil compaction and topsoil removal effects on soil properties and seedling growth in Amazonian Ecuador. For. Eco. and Management. 82: 197-209.