Introduction Experiment of Australia Pinus elliottii×P. caribaea in Southeast Guangxi

To assess the performance of Pinus elliottii × P. caribaea from Australia in southeast Guangxi,the comparative cultivation test of Pinus elliottii × P. caribaea,Pinus elliottii,Pinus massoniana,and Pinus caribaea var. hondurensis,demonstration afforestation of Pinus elliottii × P. caribaea,resin tapping test and aspect effect on planted Pinus elliottii × P. caribaea were studied. The results showed that the Pinus elliottii × P. caribaea could adapt to the environmental conditions of Bobai in Guangxi,exhibiting fastgrowing and high production. The height,diameter at breast height,volume growth and resin output of Pinus elliottii × P. caribaea was superior to P. massoniana, Pinus elliottii and P. caribaea var. hondurensis. The most appropriate spacing for planting Pinus elliottii × P. caribaea was 2. 5 m × 4 m,and it performed better in east and west aspect. However,among the 4 tested species,the Pinus elliottii× P. caribaea was the most severely damaged by Dioryctria splendidella. The Pinus elliottii × P. caribaea could be used as substituting species in pine plantation development and rejuvenation of low production pine forest in southeast Guangxi,and prioritized to plant on slopes facing east or west,laying emphasis on D. splendidella control.