Analysis on Yantuo Resources and Suitable Environmental Factors in Yunnan Province
Abstract:Objective:Yantuo is a main raw material of Yanlu Rukang tablet and other Chinese patent medicines.Through investigation and analysis,the study provides scientific basis for provenance selection and cultivation of Yantuo in Yunnan Province.Methods:Based on field investigations in the main distribution areas of Yantuo in Yunnan Province,the relationship between the original plants,distribution regularity,environmental factors and chemical composition of Yantuo was studied and analyzed by SAS 9.2.Result:The commonly used medicinal materials of Yantuo involve three sources:Rodgersia sambucifolia,R.pinnata and R.aesculifolia.The content of bergenin is significantly different due to the influence of provenance and environmental factors.Conclusion:In Yunnan province,the best provenance for cultivation of Yantuo was R.sambucifolia.The optimum areas for the cultivation of Yantuo are Lijiang and Luquan county at altitudes of 2 600~2 800 m,acidic soils of yellow or yellow brown soils,and regions with annual rainfall of 1 000~1 100 mm and annual average temperature of 18~19 ℃ are the most suitable areas for the cultivation of Yantuo.