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杉木在不同的自然条件和生物条件的长期影响下发生变异。通过变异、遗传和选择的共同作用,逐步产生了多种多样的类型。不同的类型,它可以具有或不具有在田间被确认的显著形态变异。但每种变异都具有其生理学基础。变异虽有遗传的变异和不遗传的变异,但进行类型选择时,不得只从表型变异入手,选择与选种目标相关的表型变异,再通过后代测定,选出遗传上较稳定的变异。杉木冠型变异与生长量有关。据南京林产工业学院调查洋口林场7—10年生林分中,浓密冠型比稀疏冠型的材积大100％,比林分大50％;江西省林科所用材林室调查奉新躁下林场8年生林分中,浓密冠型材积比全林分平均大20％。赣州地区
Cedar changes under the long-term effects of different natural and biological conditions. Through the combined effects of mutation, inheritance and selection, a great variety of types gradually emerge. Different types, with or without significant morphological variations identified in the field. But each variation has its own physiological basis. Although there are genetic variation and non-genetic variation, the type selection should not only start with the phenotypic variation, but also select the phenotypic variation that is related to the selection target, and then select the more stable genetic variation . Cephalopod variation and the amount of growth related. According to the survey conducted by Nanjing Institute of Forest Products Industry, Yangkou Forest Farm 7-10 annual stands, the crown-type crown thicker than the volume of large 100%, 50% larger than the forest; Among the 8-year-old stands, the crowned crowns are 20% larger than the whole stands. Ganzhou area