Selection on Families of Pinus Massoniana,Pinus elliottii and Pinus taeda in Southern Region of Guang xi

The growth characteristics of Pinus taeda and Pinus elliottii introduced from America were compared with that of the native Pinus massoniana.The results in the fifteenth year indicated that under the same condition of site and cultivation,Pinus massoniana showed the best growth performance,while Pinus elliottii showed the best performance in stem form and branching angle.Comprehensive speaking,one superior family from Pinus taeda and Pinus elliottii and three families from Pinus massoniana were selected as breeding and extension materials.