【摘要】 履带式拖拉机和轮式拖拉机由于其走行机构的不同,其集材道土壤压实也存在差异,特别衡量土壤压实的两个重要指标——土壤硬度和孔隙度——两种机型不一致。通过对调查测定数据进行计算处理以及用灰色系统理论进行动态分析,结果表明:与轮式拖拉机相比,履带式拖拉机对苗木生长是有利的。更多还原

【Abstract】 The soil condence of skidding trails is different because of the difference of tractor moving mechanism. The soil compaction and the soil porosity of crawler and wheeled skidding trails are different. Grey dynamic analyses show that effects of the soil porosity to the seedling growing is greater than soil compaction. The crawler tractor logging is better than wheeled tractor logging to seedling growing.更多还原