应用吸管法进行风沙土机械组成分析的实验研究

The Study of Analyzing the Mechanical of Aeolian Sandy Soil Using Straw Based on Experiment

土壤机械组成分析就是指土壤粒径分析,即测定组成土壤的不同直径颗粒的含量。通过机械组成分析可以定量地了解土壤质地的粗细、理化性状、肥力状况及土壤的发育情况。经过从毛乌素沙地、腾格里沙漠和浑善达克沙地等几个区域采样实验,探讨了用吸管法测定风沙土机械组成的实验控制。结果显示:在司托克斯原理指导下的吸管法测定风沙土机械组成的实验中,传统吸管法的10 cm深抽样条件下粉粒与黏粒段不能正常测定。8 cm深抽样条件下,振荡分散1 h有20%的样在粉粒与黏粒段的测定结果有悖实际,煮沸分散1 h与煮沸分散10 min两种测定结果在砂、粉、黏三段内的变异系数较大。经对比分析,在用吸管法测定风沙土机械组成实验中,以煮沸分散1 h,抽样深8 cm的实验效果良好。

The analysis of soil mechanical component is to analyze soil grain diameter. That is to say, it is to measure the content which composed the different diameter particle. The thickness of soil texture, physical and chemical properties, fertility, and the condition of soil development could be realized quantificationally through the analysis to soil mechanical component. It is researched to control the experiments that are to measure the soil mechanical component with the way of straw in the duneland of Maowusu, the desert of Tenggeli, the duneland of Hunshandake etc. It shows that., under Stokes rule＇s direction, it cannot be normally measured using the traditional straw to measure the silt and clay under the sample depth of 10 cm. The measure results in the diameter of silt and clay which reverse the reality account for 20% through 1 h surge decentralization and 8 cm sample depth. The variability is big in the diameter of grit, silt and clay through 1 h and 10 min boil decentralization separately. By contrast with the different ways, the effects are nicer tocontrol 1 h boil decentralization and 8 cm sampling depth in the process of measure aeolian sandy soil mechanical component.