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对苏南杉木５０个优树自由授粉半同胞家系林１２ａ木材基本密度测定表明，优树子代有显著变异，家系间变异＞家系内变异。木材（基本密度）性状与树高有显著中等强度负遗传相关，与胸径、材积的负遗传相关不明显。性状变异的大小为树高＞胸径＞基本密度。供试群体中有９个家系子代生长和材性优于对照。经材积生长与材性性状两阶段独立选择法联合改良，选出句东２４、溧黄１、句１２、句１４四个优质高产的当地杉木优良家系，１２ａ材积遗传增益达１４．０％～４２．２％，基本密度遗传增益为０．９％～６．０％。这些优良家系为杉木定向改良应用提供了材料基础。
The determination of basic wood density of semi-sib families in semi-sib families of 50 elite free-pollinated southern part of Cunninghamia lanceolata showed that there were significant variations in the progenies of elite trees, variation among families> variation within families. Wood (basic density) traits were significantly and moderately negatively correlated with tree height, but negatively related to DBH and volume. The size of trait variation was tree height> DBH> basal density. There were nine pedigrees in the test population that grew and material better than controls. Through the two-stage independent selection method of biomass growth and material traits, we improved the high quality local Cunninghamia lanceolata family with four good quality and high yield in Dongdong 24, Lihuang 1, Sentence 12 and Sentence 14, the genetic gain of 12a was 14.0% 42.2%, the basic density of genetic gain of 0.9% to 6.0%. These excellent families provide the material basis for improved orientation of Chinese fir.