Objective To investigate the effects of climate change on the geographical distribution of Astragalus membranaceus(Fisch.)Bge.var.mongholicus(Bge.)Hsiao in Gansu Province,and predict its potential habitat;To provide a theoretical basis for resource conservation of cultivation of A.membranaceus(Fisch.)Bge.var.mongholicus(Bge.)Hsiao.Methods Based on the distribution data of A.membranaceus(Fisch.)Bge.var.mongholicus(Bge.)Hsiao from field surveys,the maximum entropy model and geographic information system were used to simulate its potential habitat in Gansu Province for the current(1970-2000)and future(2041-2060)periods,and the contribution of environmental factors and the results of the knife-cut test were integrated to assess the important factors governing the distribution of A.membranaceus(Fisch.)Bge.var.mongholicus(Bge.)Hsiao.Results The dominant environmental variables governing the geographical distribution of A.membranaceus(Fisch.)Bge.var.mongholicus(Bge.)Hsiao were precipitation in the wettest month,average temperature in the wettest season,and elevation.The potential suitable area of A.membranaceus(Fisch.)Bge.var.mongholicus(Bge.)Hsiao in Gansu Province under current climatic conditions was 65 902.66 km2,and the high suitable area was mainly concentrated in Dingxi District.In the future period,the suitable areas of A.membranaceus(Fisch.)Bge.var.mongholicus(Bge.)Hsiao under the scenarios of SSP126,SSP370 and SSP585 all showed a decreasing trend,especially the area of the high suitable areas decreased significantly.Conclusion Future climate change will lead to a significant reduction in the suitable habitat for A.membranaceus(Fisch.)Bge.var.mongholicus(Bge.)Hsiao in Gansu Province.The suitable habitat will mainly move towards high-altitude mountainous areas,and the continuity of A.membranaceus(Fisch.)Bge.var.mongholicus(Bge.)Hsiao resources can be maintained by establishing ecological protection zones.

OBJECTIVE To explore the potential geographic distribution of Pinellia Ternata (Thunb.) Breit. in Gansu province, clarify its habitat requirements, and provide a theoretical basis for rational cultivation. METHODS Based on 100 geographic distribution points of Pinellia Ternata (Thunb.) Breit. and 39 environmental variables (including 19 bioclimatic variables, 17 soil variables and 3 topographic variables), the maximum entropy model(MaxEnt) and ArcGIS geographic information system software were used to make the habitat suitable for its evaluation and classification of suitable areas, the result of Jackknife test was used to evaluate the environmental variables that affect the habitat of Pinellia Ternata (Thunb.) Breit., the area under the ROC curve(AUC) was used to evaluate the degree of reliability of the prediction results. RESULTS The AUC was 0.993, indicating that the prediction results of the MaxEnt model were reliable. Monthly average daily temperature difference, isotherm, standard deviation of seasonal variation of temperature, annual precipitation, the wettest month precipitation, the driest month precipitation, the driest season precipitation, the coldest season precipitation and altitude were the main environmental variables affecting the growth of Pinellia Ternata (Thunb.) Breit.. The suitable areas for Pinellia Ternata (Thunb.) Breit. in Gansu were mainly concentrated in Longnan, Tianshui and Pingliang, where the areas of high, medium and low suitable areas were 16 180.4, 15 413.96, 21 204.84 km2, respectively. CONCLUSION The research results can provide a theoretical reference for the protection and standardized cultivation of Pinellia Ternata (Thunb.) Breit. resources.