论文部分内容阅读
油松优良家系的再选择翁殿伊（河北省林业科学院石家庄０５００６１）朱桂林（遵化市东陵林场）王忠民（平泉县七沟林场）河北省油松的系统改良开始于７０年代中期。据统计，全省迄今已在油松人工林和天然林中依据表现型选出优树３４１株，建立油松初级种子园１３７．７ｈ...
Selection of excellent families of Pinus tabulaeformis WENG Dian-yi (Hebei Academy of Forestry Shijiazhuang 050061) Zhu Guilin (Zunhua Dongling Forest Farm) Wang Zhongmin (Qigou Forest Farm of Pingquan County) The systematic improvement of Pinus tabulaeformis in Hebei Province began in the mid-1970s. According to statistics, the province so far has been in Pinus tabulaeformis plantations and natural forests based on the phenotype selected 341 elite trees, the establishment of Chinese pine primary seed orchard 137.7h ...