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通过农田土壤压实模拟装置,以基质势作为土壤压实程度指标,对东北黑土区典型农田黑土在0.1～2.5s作用时间下的压实效应进行了研究。结果表明,农田黑土在100、200、400和800kPa接地压强下,0.1～2.5s作用时间下存在过度压实的阈值时间。阈值时间可以通过土壤基质势与作用时间关系确定,阈值时间随土壤有机质含量提高而提高。因此,在保证作业质量的前提下,合理选择机具作用时间、降低接地压强和提高有机质含量是避免农田土壤过度压实的重要措施。
The compaction effect of typical farmland black soil in the northeastern black soil region at the action time of 0.1 ~ 2.5s was studied by field soil compaction simulation device and matrix potential as the index of soil compaction degree. The results showed that there was over-compaction threshold time of 0.1-2.5 s in farmland black soil under the contact pressure of 100, 200, 400 and 800kPa. The threshold time can be determined by the relationship between soil matrix potential and action time, and the threshold time increases with the increase of soil organic matter content. Therefore, under the premise of ensuring the quality of work, a reasonable choice of tool action time, reduce the contact pressure and improve organic matter content is to avoid excessive compaction of farmland is an important measure.