Assessment of Crawler Tractor Effects on Soil Surface Properties

Caspian Journal of Environmental Sciences

卷:11

关键词: Total porosity;    Skid trail slope;    Soil disturbance;    Skidding;    Moisture content;    Bulk density;   

DOI  :  

来源: DOAJ

【 摘 要 】

Skidding operations can cause considerable and wide spread soil disturbance. The objective of this studywas to evaluate the effects of ground skidding operations on soil compaction, moisture content, and totalporosity at different levels of slope and traffic frequency. Four levels of traffic intensity (3, 8, 13, and >13passes of a Crawler Tractor Onezhets – 110) and three levels of slope (<10%, 10%-20% and > 20%) wereapplied to assess soil disturbance. The soil samples from the depth interval 0-10 cm were collected with asoil hammer and rings. Results showed that dry bulk density, moisture content and total porosity wereaffected considerably by slope and traffic frequency of skid trails. Bulk density was drawing near to thecritical value after 8 passes in the trail with the slope >20%; when the number of machine passes increasedfrom 8 to 13 passes, the additional bulk density increment was negligible. Irrespective of traffic frequency,dry bulk density increased significantly in the slope >10% compared to the slope <10%; however there wasno significant difference between slopes 10-20% and >20% . Minimum moisture content was measured as27% on the skid trail versus 47% in the undisturbed area. A negative correlation was found betweenmoisture content and dry bulk density. Total porosity was measured as a maximum 58% to a minimum44% on the skid trail treatments, and 65% in the undisturbed area. Soil disturbance was extendeddramatically on the treatments with slopes >20%, so dry bulk density on the treatments with 8 passes andslopes >20% (1.38 g cm-3) was significantly higher than on the treatment with 13 passes and slopes <10%(1.32 gcm-3). Results showed that slope >10% increased soil disturbance quite dramatically.

【 授权许可】

Unknown