为了便以开展松树人工授粉和杂交育种工作,我们于1978年冬至1979年春,对湿地松、加勒比松(古巴)、火炬松、南亚松和马尾松等树种的开花情况进行了观察,现将观察初次结果简介如下。一、材料的观察:1.树种的年龄:加勒比松(原产古巴)、南亚松、马尾松都是(1964年定植)15年;湿地松(64、72定植)15年和7 In order to carry out artificial pollination and crossbreeding of pine trees, we observed the flowering of species such as Pinus elliottii, Caribbean Pine (Cuba), Pinus taeda, Pinus sylvestris and Pinus massoniana from the winter of 1978 to the spring of 1979, The first result is as follows. First, the material observations: 1. The age of the species: Caribbean pine (native to Cuba), South Asia pine, massoniana are (1964 colonization) 15 years; Slash pine (64,72 colonization) 15 years and 7