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集材道土壤受拖拉机反复走行作用产生地表轧乱和土壤压实现象，造成水土流失和腐殖质丧失，这对更新苗木的生长产生了不良影响．本文通过实地调查测定，应用灰色系统理论，研究了拖拉机集材时集材道上土壤硬度、孔隙度的变化及对苗木生长的影响。在履带式拖拉机集材道上，土壤的硬度、孔隙度都比轮式拖拉机集材道上的大。与土壤硬度相比，孔隙度对苗木生长的影响更大些。从而得出了就苗木高生长而言，履带式拖拉机比轮式拖拉机的损害要小。
Cultivated soil repeatedly traversed by tractors to cause surface chaos and soil compaction, resulting in soil erosion and loss of humus, which adversely affected the growth of seedlings. In this paper, through the field survey and determination, the gray system theory was applied to study the changes of soil hardness and porosity and the effects on the seedling growth of tractor skidding. In tracked tractor skidding, the hardness and porosity of the soil is greater than that of the wheeled tractor skid. Compared with the soil hardness, porosity has a greater impact on the growth of seedlings. It is concluded that crawler tractors have less damage than wheeled tractors in terms of seedling height.