Through investigating the growth of Paulownia elongata on Shajiang black soil of Huaibei Plain and applying a quantitative theory to Select the principal factors thataffect Paulownia elongata growth,the soil region has been divided into 9 site types. By using Richards function as the guide curve and BHD of average superior trees as the appraisal target,a site index model has been set up,and a site index mark table has been compiled. The latter makes it possible to consistently appraise the site quality of both forestland and non-stocked land in a saing system. Considering that the planting den...
