[Planting Regionalization of Climate Suitability on Cornus officinalis in Shaanxi Province Based on Max Ent and GIS]

To predict the suitable distribution of Cornus officinalis in planting regionalization.

Based on early field surveys and the geographic information data of Cornus officinalis specimens in the Chinese Virtual Herbarium( CVH),the 27 climatic variables,6 soil variables and 1 topographic variable in Shaanxi province were downloaded in World Clim and Harmonized World Soil Database, respectively. The Maximum entropy( Max Ent) was used to predict the potential suitable distributions and areas in Shaanxi province using geographic information system( GIS) after all the variables were made correlational analyses.

The AUC of Max Ent( 0. 98) showed the modeling process had a very high precision in this running. The statistical analysis of environment variables in highly potential areas demonstrated that Cornus officinalis prefered to grow in areas with average monthly minimum temperature of March( tmin3,- 3. 0 ~ 9. 8 ℃),precipitation of March( prec3,7 ~ 185 mm),annual average temperature( bio1,6. 7 ~ 17. 6 ℃),annual precipitation( bio12,558 ~ 1 817 mm) and altitude( alt,98 ~ 1 620 m). The predicted results showed that the total most suitable planting area of Cornus officinalis was as high as 45 000 km2 and it was divided into four most suitable regions according to climate types and topography in Shaanxi province. The four high suitable planting regions were the humid climate planting regions in the northern slope of Qinling Mountain zone( Ⅰ-1,5 900 km2),the sub-humid climate planting regions in the basin and valley of Shangluo-Danjiang( Ⅰ-2,11700 km~2),the humid climate planting regions in the basin and valley of Hanzhong-Ankang( Ⅱ-1,15100 km~2),and the humid climate planting regions in mountainous regions of Micang-Bashan Mountain( Ⅱ-2,8 400 km~2),respectively.

It is suggested that the planting base should be built in the Parts Ⅱ-1,Ⅰ-2 and Ⅰ-1 based on the original cultivation, the better varieties with high yield, good quality and disease resistance should be vigorously promoted the cultivation, and the mechanical picking tools should be researched to reduce the labor cost for fruit gathering. It will give a scientific method to build suitable planting regionalization to improve the quality of medicinal materials in the modernization of traditional Chinese medicine.