韶关丹霞地貌铁皮石斛野生资源调查与生境分析OACSTPCD

Objective:To investigate the current status of wild resources of Dendrobium officinale in Danxia landforms in Shaoguan,Guangdong province and provide references for the on-site protection,conservation,and the simulated wild cultivation of wild D.officinale.Methods:The wild resources of D.officinale in China were compiled,and based on the tracking survey of wild D.officinale distribution and habitat in Danxia landforms in Shaoguan,Guangdong,conducted by this research group in the past ten years,the altitude,orientation,number of D.officinale,slope position,and slope aspect of 11 survey sites were analyzed to explore the morphological and habitat characteristics of wild D.officinale in Danxia landforms.Results:This investigation recorded more than 300 clusters of wild D.officinale in Danxia landforms in Shaoguan,Guangdong,with a total weight of about 3000 g,in a critically endangered state.Field observations revealed that the stems of wild D.officinale were mostly purplish-red,about 5 to 10 cm long,with stems resembling grasshopper thighs and obvious rust-colored spots on the leaves.Wild D.officinale in Danxia landforms mostly grew in the middle or near the top of Danxia cliffs at altitudes of 100 to 500 m,often symbiotic with moss and lichen,generally growing on Danxia rock walls facing southeast to southwest with good ventilation and moist environments near water,and growing better in semi-shady,cool,and moist conditions.Conclusion:Field investigations confirmed that the Dendrobium recorded in the Collected Notes on the Materia Medica is D.officinale,with a medicinal history of over 1500 years.D.officinale in Danxia landforms is one of the main sources of D.officinale in China.Due to its low natural reproduction rate and long-term human collecting,wild D.officinale in Danxia is now critically endangered,and there is an urgent need to conduct investigations and protection work on wild D.officinale resources.