Characterization of Black Soil Infiltration under Different Mechanical Compaction Conditions
To explore the soil properties and soil infiltration characteristics of black soil under different mechanical compaction conditions,taking the typical black soil of Keshan County as the research object,three types of machinery(Huaxia HX2104-C:154 kW,John Deere 554:40 kW,and China Haishan:19 kW)were set up in Keshan County to carry out 0,1,3,5,7 and 9 simulated compactions on the furrow of soybean land after autumn harvest.The effects of different mechanical compaction conditions on soil physical properties and infiltration characteristics were analyzed by measuring the soil density,water content,porosity,and soil infiltration characteristics.The results showed that in the 0‒10 cm soil layer,large machinery,medium machinery and small machinery compaction bulk density increased 54.17%,56.25%,46.88%;total porosity decreased 31.58%,28.07%,29.82%;water content decreased 19.35%,16.13%,9.68%.After the first compaction,all the machinery had the most significant effect on soil prorperties,which increased the bulk density by more than 32.29%and reduced the porosity by more than 15.8%,while only the large machinery significantly reduced the soil water content by 9.6%.With the increase of compaction time,the soil bulk density of the 10‒20 cm soil layer after mechanical compaction increased from 1.25 g·cm-3 to 1.58 g·cm-3,the total porosity decreased from 52.16%to 38.22%,and the water content decreased from 27.33%to 20.67%.Among all the machines,the bulk density and porosity of soil were significantly affected by the first compaction of large machinery,while the influence of medium and small machinery on the physical properties of soil was mainly due to the cumulative pressure effect.For the first compaction,the cumulative infiltration volume of 2 h was reduced by 87.16%and 50.81%by medium and small machinery.The initial infiltration rate was reduced by 87.59%and 70.93%.The stable infiltration rate was significantly reduced by 92.90%by medium machinery.After three times of compaction,the cumulative infiltration volume of 2 h and initial infiltration rate were significantly reduced by 73.29%and 75.67%by large machinery,while the stable infiltration rate was significantly reduced by 74.07%and 66.97%by large and small machinery.There was no significant difference in soil infiltration characteristics after five times of compaction.Both soil bulk density and soil pore characteristics of the 0‒20 cm soil layer affect the infiltration characteristics of mechanically compacted soil,with soil bulk density of the 0‒10 cm soil layer being the dominant factor affecting the integrated soil infiltration characteristics.
万方数据
维普
