OBJECTIVETo study ecology suitability rank dividing of Polygonum capitatum for selecting artificial planting base and high-quality industrial raw material in Guizhou province.

METHODBased on the investigation of PCB and DEM data of Guizhou province, the relationship between the gallic acid content in P. capitatum and topographical conditions was analyzed by statistical analysis. The geographic information systems (GIS)-based assessment and landscape ecological principles were applied to assess ecology suitability areas of P. capitatum in Guizhou.

RESULT AND CONCLUSIONslope, aspect and altitude are main topographical factors that affect the content of gallic acid in P. capitatum. The gallic acid content of P. capitatum is higher in the lower altitude, shady slope and smaller slope areas. The gallic acid content is higher in the eastern areas of Guizhou province.

Adaptation, Biological ; China ; Ecology ; Gallic Acid ; analysis ; Geographic Information Systems ; Polygonum ; chemistry ; physiology ; Topography, Medical

ABSTRACTOBJECTIVE To study the growth suitability of Magnolia officinalis on the basis of investigation on the correla-tion between its growth and ecological factorsand to provide scientific basis for determining the suitable planting region of Magnolia officinalis in China.METHODS Based on the investigation of 43 sampling points of Magnolia officinalis the eco-logical factors affecting its growth was calculated by Maxent.The geographic information systemGIS was applied to assess the growth suitability rank dividing of Magnolia officinalis in China.RESULTS Precipitation of OctoberaltitudeSeptember precipitationprecipitation in July is the main ecological factors that influencing the growth of Magnolia officinalis .The habi-tat suitability values of Magnolia officinalis in Southwest of Hubei province and Eastern Chongqing is highest.CONCLUSION Hubei and Chongqing are the suitable planting areas of Magnoliae officinalis .