A study was conducted to investigate the effects of skid trail slope and traffic levels on soil disturbances at two soil depths （0--10 and 10-20 cm）. The treatments were set at four traffic levels （2, 7, 12 and 20...A study was conducted to investigate the effects of skid trail slope and traffic levels on soil disturbances at two soil depths （0--10 and 10-20 cm）. The treatments were set at four traffic levels （2, 7, 12 and 20） two slope classes （〈20% and 〉20%） and two soil depths （0-10 and 10-20 cm）. Results show that skidder traffic, longitudinal slope and soil depth have significant effect on soil bulk density in skid trail. Compari- son of average soil bulk density in different traffic levels shows that there are significant differences in average bulk density between different traffic levels and control （p〈0.05）. The average bulk densities in different slopes and soil depths are significantly increased with increase in traffic levels, maximized at 12 passes （p〈0.05）, but there are no significant differences between 12 and 20 passes. The interaction effects between traffic and soil depth are significant （F005,3=0.109, p〈0.001）. For all traffic treatments, there are significant differences in soil moisture con- tent between the two slope classes and the two depths （p〈0.001）. However, the interaction effects between traffic levels and slope classes are not significant （p 〉0.05）, although skidder traffic and slope affected soil moisture content.展开更多
文摘A study was conducted to investigate the effects of skid trail slope and traffic levels on soil disturbances at two soil depths （0--10 and 10-20 cm）. The treatments were set at four traffic levels （2, 7, 12 and 20） two slope classes （〈20% and 〉20%） and two soil depths （0-10 and 10-20 cm）. Results show that skidder traffic, longitudinal slope and soil depth have significant effect on soil bulk density in skid trail. Compari- son of average soil bulk density in different traffic levels shows that there are significant differences in average bulk density between different traffic levels and control （p〈0.05）. The average bulk densities in different slopes and soil depths are significantly increased with increase in traffic levels, maximized at 12 passes （p〈0.05）, but there are no significant differences between 12 and 20 passes. The interaction effects between traffic and soil depth are significant （F005,3=0.109, p〈0.001）. For all traffic treatments, there are significant differences in soil moisture con- tent between the two slope classes and the two depths （p〈0.001）. However, the interaction effects between traffic levels and slope classes are not significant （p 〉0.05）, although skidder traffic and slope affected soil moisture content.
