崩岗红土层土壤液塑限特性及影响因素研究

Study on Liquid Limit and Plastic Limit Characteristics and Factors of Benggang in Red Soil Layer

土壤液塑限可以反映土壤的入渗、抗冲、抗蚀和抗剪等情况,对崩岗的水土流失研究有重要的意义。通过对崩岗红土层土壤的液塑限研究以及颗粒分析和有机质测定,分析土壤有机质含量和土壤颗粒分布对土壤液塑限的影响。结果表明:崩岗红土层土壤为高液限黏土,土壤状态为坚硬;土壤液塑限值与粗砂粒、细砂粒和粉粒含量相关性不明显,与极细砂粒和黏粒含量呈二项式关系,其中极细砂粒含量与土壤液塑限呈负相关;黏粒含量与土壤液塑限均呈显著正相关关系,且模拟的方程可以较准确地描述土壤液塑限和各因素的相关关系。研究结果有利于丰富崩岗侵蚀机理的研究。

Liquid limit and plastic limit of soil reflect soil infiltration,erosion,corrosion and shear,etc,which has the important significance on the research of soil erosion of Benggang.In this study,liquid limit and plastic limit,soil particles and soil organic matter in red soil layer were surveyed and evaluated in order to analyze the influences of soil organic matter content and soil particle size distribution on the soil liquid limit and plastic limit.The results showed that the soil in red soil layer of Benggang is the clay soil with high liquid limit,soil status is hard;liquid limit and plastic limit did not have an obvious correlation with coarse,fine sand and silt contents,and they showed a binomial relationship with extreme fine sand.Among them,extreme fine sand content was negative correlation with liquid limit and plastic limit;clay content was significant positive correlation with liquid limit and plastic limit.The simulation equation can accurately describe the relationship between liquid limit and plastic limit and various factors.These study findings will enrich the research of erosion mechanism of Benggang.