轮胎压实对土壤水分入渗性能的影响

Effect of Wheel Traffic Induced Soil Compaction on Soil Water Infiltration

固定道保护性耕作可以有效地降低土壤压实程度,改善土壤结构。为此,以大田土壤水分入渗试验为依据,分析一年两熟区固定道保护性耕作系统对土壤水分入渗特性的影响,为其推广应用提供理论参考。试验结果显示:一年两熟区机具随机行走作业在表层土壤造成明显的压实;固定道保护性耕作可以降低0～30cm土层容重,降低0～40cm土层土壤紧实度,改善土壤结构,从而显著提高土壤水分入渗性能;相对于非固定道保护性耕作,固定道保护性耕作土壤水分稳定入渗强度提高111.1%,3h累积入渗量提高92.4%。

Controlled traffic with conservation tillage is an useful way to solve the problem of wheel track induced soil compaction.Based on field infiltration experiment,the effect of controlled traffic with conservation tillage on the performance of water infiltration was analyzed,so as to promoting its application in annual two-crop region in northern China.Results showed that,random wheel track caused significant soil compaction in the surface layer in annual two-crop region.Controlled traffic with conservation tillage reduced soil bulk density in 0~30cm soil layer and cone index in 0~40cm soil layer,therefore improved water infiltration.Compared with non-controlled traffic treatments,controlled traffic with conservation tillage increased stable water infiltration rate and accumulative infiltration for three hours by 111.1% and 92.4%,respectively.