Abstract: Continuous planting obstacle is a serious problem in Panax notoginseng culture, but few studies have been performed to evaluate the soil quality under P. notoginseng continuous planting. In this paper, a comprehensive assessment was made on the soil quality under P. notoginseng continuous planting by using principal component analysis and cluster analysis. Our results showed that the key factors determining the soil quality were the diversity of microorganisms, abundance and relative ratio of soil fungi, and soil phosphorus and potassium contents. The comprehensive assessment index (f _value) could better reflect the soil quality and the growth status of P. notoginseng plant, being an appropriate index for the assessment of soil quality under P. notoginseng continuous planting.

Key words:   , ozone deposition, ozone deposition resistance., ozone dry deposition rate, ozone dry deposition flux