Abstract:

Selecting five clear cutting operation with different skidding methods and selective cutting operation of thirty percent intensity, this paper compared the change level of soil physical and chemical properties after harvesting.With the consideration of the affection of skidding volume and the area of skidding trials, it also revealed the disturbance degree of soil after different harvesting methods by means of principle component analysis (PCA).The results indicated that the disturbance degree of soil physical and chemical properties of clear cutting by walking tractor skidding was at the most, the order of the disturbance degree of others were as followings :clear cutting by dirt chute skidding > clear cutting by push cart skidding >clear cutting by high-lead cableway skidding >clear cutting by suspended cableway skidding >selective cutting by manual skidding.

Key words: Cutting methods, Skidding methods, Soil physical and chemical properties, Disturbance degree, Principle component analysis