Assessment of Mechanical Properties of Forest Soils for Logging Practices and Road Construction (Case study: Patom District, Kheyroud Forest)
Message:
Abstract:
One of the most important principles that forest managers should consider is the kind and methods of logging and transportation of forest products. Assessment of mechanical properties of forest soils is an important criterion in selecting and using suitable machines، because the forest floor bears the pressures of machines. On the other hand proportion of machines with soil properties plays important role in sustainable yield of forests. In order to obtain these objectives، mechanical properties of forest soil such as Atterberg limits، liquidity index، plasticity index، consistency index، grain size distribution and soil classification base on Unified Soil Classification System were assessed in Kheyroud Forest. The results showed that soils are fine grained and the percentage of clay in all samples is more than 5% so the soil is sensitive to freezing. The liquidity index for most of samples is less than to 0. 5 and so wheeled skidders can be used in most of the region except samples with liquidity index more than 0. 5 which crawler skidders should be used. All samples had a liquid limit greater than 30; therefore soil is sticky and should be considered when using machines. With regard to plasticity index، the soil showed high tendency in water absorption and will be dried slowly، so the machines should be scheduled and used in dry weather. Soil can not be used for road construction without physical and mechanical improvement. The elevation range of study area is up to 900 meters above sea level so risk of freezing is rareness; therefore sensitiveness of CL and CH soils to freezing is not very important in this region.
Language:
Persian
Published:
Journal of Forest and Wood Products, Volume:64 Issue: 1, 2011
Pages:
65 to 76
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