No abstract

Pyrola decorata is a native plant species on Mt. Taibai in the Qinling Mountains. Because of its medicinal value, a large amount of wild P. decorata has been excavated in recent years. As a result, the P. decorata population on Mt. Taibai has gradually decreased. In order to protect P. decorata, it is important to study the relationship between P. decorata quality and selected chemical properties of rhizosphere and non鄄rhizosphere soil. Plant and soil samples were collected from different habitats on Mt. Taibai and taken to a laboratory for analysis. The plant samples were analyzed to determine the total flavonoid, tannin, hyperin, and quercetin content of P. decorata. The antioxidant activity ( DPPHIC 50 ) of the samples was also determined. Correlation analysis, principal component analysis, regression analysis, and path analysis were conducted to determine the relationship between medicinally active compounds in wild P. decorata and selected properties of rhizosphere and non鄄rhizosphere soil. The results indicated that in rhizosphere soil, available potassium concentration, pH, and urease were positively correlated with individual compounds in P. decorata. In contrast, for non鄄rhizosphere soil,