Regarded degenerated range and pasture in typical grassland in Zhenglan Banner was the experimental base, in view of main limiting factor for afforestation in chestnut soil,the author made experimental study on afforestation techniques.Based on division of site type in experimental district, some studies have been done.For example, selection of afforestation tree species, introduction and domestication, experiment of catchment and ground preparation, experiment on afforestation density,test on structural di...