Geochemical characteristics of molybdenum element and habitat suitability evaluation in soils, Glehniae Radix and Platycodon grandiflorus in Chifeng region, Inner Mongolia

This paper is the result of ecological geological survey engineering.

Objective This paper aims to study the geochemical characteristics and habitat suitability evaluation of Mo in soil, Glehniae Radix and Platycodon grandiflorus, and to provide a geological scheme for the standardization and scientific management of medicinal materials.

Methods Descriptive statistics, correlation analysis, bioconcentration factor and habitat suitability evaluation model of Chinese herbal medicines were used to research the characteristics and influencing factors of molybdenum content in soil, Glehniae Radix and Platycodon grandiflorus, and to evaluate the habitat adaptability level of Glehnia littoralis.

Results The surface soil Mo content is 0.45−2.87 mg/kg, with an average of 0.68 mg/kg. The Mo content in the root soil of Glehniae Radix and Platycodon grandiflorus is 0.55−1.05 mg/kg, with an average of 0.75mg/kg, which is richer–rich level. The Mo content of Glehniae Radix is 0.31−1.00 mg/kg, with an average of 0.63 mg/kg, and the BCF_{Glehniae Radix} is 83.28%. The Mo content of Platycodon grandiflorus is 0.07−0.79mg/kg, with an average of 0.33 mg/kg, and the BCF_{Platycodon grandiflorus} is 45.39%. The Mo-rich root soil provides a rich source of Mo for the growth of Glehniae Radix and Platycodon grandifloras. Alkaline soil promotes the migration and enrichment of Mo in the soil, Glehniae Radix and Platycodon grandiflorus.

Conclusions The Mo source of Mo-rich soil is mainly derived from soil parent material, followed by secondary enrichment caused by various factors such as topography and agricultural fertilization. Mo migration and enrichment in soil, Glehniae Radix and Platycodon grandiflorus is a complex biogeochemical process, which is the result of the comprehensive effect of genetic characteristics of medicinal materials, a total amount of Mo in soil, morphological characteristics of Mo, pH organic matter, Eh, clay minerals, and other trace elements (synergistic or antagonistic) and geochemical properties of Mo. The single or total contents of As, Cd, Cu, Hg and Pb in Glehniae Radix and Platycodon grandiflorus were in line with the green industry standards of foreign trade. The comprehensive evaluation results of habitat suitability of Glehniae Radix are the most suitable grade, and the production suitability grade of land use type is suitable grade.