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在免耕覆盖地上 ,采用人工模拟降雨试验研究了拖拉机轮胎压实对土壤水分入渗和地表径流的影响。结果表明 ,轮胎压实能够破坏土壤结构 ,使土壤容重增大 ,降低入渗性能 ,机器越重 ,压实影响的深度越大。小拖拉机的压实主要在 1 0 cm以内 ,而中型拖拉机的压实可以达到 2 0 cm以上。两种机型都使 0 cm～ 1 0 cm土壤的容重显著增加 ,入渗量及入渗率明显降低 ,但二者之间无明显差别 ,说明表层土壤的孔隙结构对水分入渗起着决定性作用 ,小拖拉机压实对水分入渗的影响不容忽视
On tillage-no-tillage ground, the effect of tractor tire compaction on soil water infiltration and surface runoff was studied by artificial simulated rainfall test. The results show that the compaction of the tire can destroy the soil structure, increase the bulk density of the soil and reduce the infiltration performance. The heavier the machine is, the greater the depth of the compaction effect is. Compaction of small tractors is mainly within 10 cm, while medium tractor compaction can reach more than 20 cm. Both of the two models increased the bulk density of 0 cm ~ 10 cm soil, infiltration rate and infiltration rate obviously decreased, but there was no significant difference between the two models, indicating that the pore structure of surface soil plays a decisive role in water infiltration Effect of small tractor compaction on water infiltration can not be ignored