THE INVESTIGATION AND ANALYSIS OF INTRODUCTION AND EXTENSION FOR PINUS ELLIOTTII AND P. TAEDA IN ZHEJIANG PROVINCE

Pinus elliottii E. and P. taeda L. have been introducted in Zhejiang province for more than 40 years and the species have been afforested for seven thousand ha.. The productive practice shows that these species have fast growth, straight stem, extensive distribution range and better adaptability, higher resistance to pests and diseases and other good characters. The earlier introductive trees have flowered and fruited and juvenile forests of the second generation have been established. It has important significance for riching the afforestation species and for raising the productive ability of forest land by successful introducing these exotic troe species in this province.