The investigation of quality of pine oleoresin of different ages of cultivated Pinus massoniana
Abstract
This research is aimed to survey pine oleoresin productions among 7-years,10-years,12-years and 15-years cultivated Pinus massoniana. The result shows that the productions of pine oleoresin of single plant of P. massonianais increased with the increase of DBH. There is significantly different production among different age of P. massoniana with the same diameter of P. massoniana. The production of pine oleoresin per hectare of 7-years,10-years,12-years and 15-years cultivated P. massoniana are 1. 35,4. 49,9. 16 and 17. 11 kg respectively in each day. Following the forest age increased,the harvested trees and the number of bigger diameter trees in the per unit area are significantly increasing,as a result,the yield of pine oleoresin per unit area are also significantly increasing.