机械压实对不同类型苜蓿地土壤结构影响的试验研究

Experimental Study on Effect of Mechanical Compaction on the Soil Structure in Different Types of Alfalfa Fields

针对多年生苜蓿地土壤机械压实严重的问题,研究了不同接地压力下机械对中壤土和砂土两种苜蓿地压实后土壤结构的变化情况。试验表明:随压实次数和接地压力的增加,苜蓿地土壤容重、土壤坚实度增加,土壤饱和导水率减小,中壤土的压实程度较砂土严重,压实次数和接地压力对不同层次的土壤结构参数影响不同。土壤饱和导水率和压实次数具有相关关系。

In view of the serious problem with mechanical soil compaction in perennial Alfalfa fields,the changes in the soil structure after being compacted by machines under different ground pressures in two Alfalfa fields containing middle loam and sandy soil respectively.The experiment shows that with the increase in the number of compactions and ground pressure,soil bulk density and soil firmness increased and soil saturated hydraulic conductivity decreased,the compaction degree of medium loam was more serious than that of sandy soil,the number of compactions and ground pressure had different effects on soil structure parameters at different depths,and there was a correlation between soil saturated water conductivity and compaction times.