Ecology suitability study of Cistanche deserticola in Alxa GIS-based ecological optimization of spatial patterns of land resources Quantitative study on ecological suitability of Chinese herbal medicine based on GIS The Establishment and Application of the Ecological Mapping System of the Ordos Grassland Station Sampling Methods of Vegetation Investigation in a Tropical Rain Forest at Bawangling Nature Reserve,Hainan Ecology suitability study of Lomatogonium rotatum in Inner Mongolia Suitability evaluation of eco-climatic conditions for high quality rice production in Sichuan Province GIS-based soil fertility evaluation——a case study in Changchun suburb area