Traditionally, the studies on electrical discharges for soil remediation primarily focus on the degradation efficiency and reaction pathways of various types of discharges for various types of contaminants. In comparison, less attention has been paid on the investigation on the physical property of the plasma initiation and development process, which is essential for the generation of reactive species responsible for plasma-related reactions. In this paper, the electrical and optical behaviors of corona discharge in soil produced by negative DC high voltage are investigated. The images of the discharge are recorded, and the influence of different operating variables, including applied voltage, soil density, soil particle size, and water content level, on the discharge streamer structure and plasma temperature are examined through experiments. Possible mechanisms that could contribute to the observed phenomenon are discussed.

传统上，土壤修复放电的研究主要集中在各种放电对各种污染物的降解效率和反应途径。相比之下，对等离子体引发和发展过程的物理性质的研究较少受到关注，这对于产生负责等离子体相关反应的活性物种至关重要。本文研究了负直流高压在土壤中电晕放电的电学和光学行为。记录放电图像，并通过实验研究不同操作变量，包括外加电压、土壤密度、土壤粒度和含水量水平对放电流注结构和等离子体温度的影响。