种子园是经过人工选择的无性系或子代所组成的人工林。它是林木良种繁育的一种主要形式。自七十年代初期起到目前为止,我区已建立杉木嫁接种子园近八千亩,有的种子园进入或逐渐进入结实盛期,为生产部门提供一定的初级良种。但就全区范围情况来看,大多数种子园经营管理粗放,种子产量不高,远远不能适应杉木生产的需要。因 The seed orchard is a plantation consisting of artificially selected clones or offspring. It is a major form of tree seed breeding. Since the early 1970s, up to now, nearly eight thousand Chinese fir grafted seed orchards have been established in our district, and some seed orchards have entered or gradually entered the flourishing peak period, providing some primary seed for the production sector. However, judging from the region-wide situation, most of the seed orchards operate extensively and their seed yield is not high enough to meet the needs of fir production. because