选择杉木优良母树(正号树),建立种子园,是实现杉木造林良种化的重要途径。选择优树是建立杉木种子园的先决条。件,是当前林木育种的重要环节。自一九七三年以来,我区杉木良种选育工作,走群选群育道路,进展较快。据初步统计,现全区已选出杉木优树2273株,经一九七七年复选后中选的有477株,占初选出优树 Selection of fine Chinese fir tree (positive sign tree), the establishment of seed orchard, is an important way to achieve afforestation of Chinese fir. Choosing a good tree is a prerequisite for establishing a fir seed orchard. Pieces, is an important part of current tree breeding. Since 1973, the breeding of fine varieties of Chinese fir in our district has taken the grouping of breeding roads and progressed rapidly. According to preliminary statistics, 2273 superior trees have now been selected in the region, and 477 have been selected after the election in 1977,