不同采伐、集材方式对林地土壤理化性质影响的研究

选择５种不同集材方式的皆伐作业与采伐强度为３０％的择伐作业，进行土壤理化性质指标变化程度的比较。在考虑各种作业的集材量和集材道面积的情况下，经主成分分析得出不同采伐、集材方式对林地土壤理化性质的干扰程度。认为，以皆伐作业手扶拖拉机集材为最大，其次为皆伐作业土滑道集材，其余依次为皆伐作业半悬索道集材，皆伐作业手拉板车集材，皆伐作业全悬索道集材，最低为择伐作业人力集材。

EFFECT ON SOIL PHYSICAL AND CHEMICAL PROPERTIES BY DIFFERENT HARVESTING METHODS

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.