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从现有林中选取优树,作为建立种子园的材料已很普遍。既然能从林分中选取优树,那么种值它的苗木中,显然存在这些优树个体。人们发现在苗圃中有个别生长特别高大的优势苗木,其生长量显然超过了因种子大小所造成的差异范围,认为这和种子的遗传性有关。据国外报导,火炬松、湿地松的优势苗(选出率为1/10000),按8×6呎定植,在十年期间优势苗的高生长显著大于对照苗,而且一直都持续增加;十年生时,火炬松、湿地松的优势苗
It is very common to choose the best tree from the existing forest as the material for establishing the seed orchard. Since we can choose the best tree from the stand, then the value of its seedlings, there are clearly those individuals. It is found that nursery growth in particularly high individual nursery stock, its growth is obviously more than the size of the seed caused by the difference between the range, that this is related to the genetic and seed. According to foreign reports, the dominant seedlings of Pinus taeda and Pinus elliottii (selected rate 1/10000) were planted at 8 × 6 feet. The height growth of dominant seedlings was significantly greater than that of the control seedlings over the ten-year period, and ten Annuals, loblolly pine, the dominant seedlings of pine