|
|||||
|
|
Characteristic site disturbance due to harvesting and extraction machinery traffic on sensitive forest sites with peat soils |
|
| Authors: | Ciaran Nugent Christopher Kanali Philip M O Owende Martin Nieuwenhuis Shane Ward |
| Institution: | a Forest Service, Department of the Marine and Natural Resources, Island Centre, Castleisland, County Kerry, Ireland b Forest Engineering Unit, Agricultural and Food Engineering Department, University College Dublin, Earlsfort Terrace, Dublin 2, Ireland c Crop Science, Horticulture and Forestry, University College Dublin, Belfield, Dublin 4, Ireland |
| Abstract: | The effects of wood harvesting and extraction machinery traffic on sensitive forest sites with peat soils were characterised with the objective of quantifying the threshold levels beyond which significant site impacts (compaction and rutting) would occur. The treatments involved running the machines in selected extraction racks (i.e., 3 m wide machine routes) while conducting normal wood thinning and extraction operations comprising one and two passes by the harvester and the forwarder with full payload, respectively. Soil disturbance thresholds were established by testing the level of significance of the difference in induced soil damage and compaction before and after machine traffic treatments. For volumetric soil water content lying between 10.0 and 14.9%, threshold cone penetration resistance levels for two 600/55–30.5 tyres were found to range from 594 to 640 kPa for deep-raised peat soil with initial strength lying between 524 and 581 kPa. In general, the proportion of the total rut depth data in each rack that exceeded the threshold level of 21.5 cm was about 5%. The threshold value corresponds to sinkage equivalent to 15% of the overall wheel diameter of the harvester, above which machine mobility would be hampered considerably. In addition, after harvester traffic the mean rut depth per unit rack length was 10.2×10?2 cm/m, and it ranged from 0.7 to 24.7×10?2 cm/m. |
| Keywords: | Rutting Soil compaction Sensitive sites Ecoefficient mechanisation systems |
| 本文献已被 ScienceDirect 等数据库收录！ | |