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对落羽杉属不同种源、家系和树种苗期、幼林期生长量（高、胸径、冠幅）、保存率和生物量及其分配（总生物量，干、枝、叶、根生物量及其比值）进行了５年研究。发现落羽杉不同种源、家系间、内均存在显著的性状变异。变异系数以种源、家系间最大，个体间其次。生物量的变异系数大于生长量。未发现不同种源、家系在不同地点存在明显互作。采用多性状综合选择法评选出７个优良种源、家系或树种（１６００、４０１、中山杉、３０４、５０２、鸡公山落羽杉和７０１），它们的生长量、生物量大，叶生物量较大，地上部分生物量／根生物量比值大。其综合选择指数值比平均值大１３．９７％～３５．３３％，树高比平均值大１１．２２％～２４．４９％，比本地近似树种（江宁池杉）大３４．５４％～４６．１８％；胸径比平均值大１２．８１％～４８．２８％，比江宁池杉大３８．７９％～８２．４２％；总生物量比平均值大５４．５９％～１１０．６７％；保存率一般也高于平均值及本省江宁池杉。这些优良种源、家系或树种可以在江苏全省及国内类似地区作用材、防护和观赏树种推广应用。
The biomass, dry matter, branch, leaf and root biomass of different species, species and species of Taxodium at seedling stage, young growth stage (height, DBH, crown), conservation rate and biomass And its ratio) for a 5-year study. It was found that there were significant variations of traits in different provenance and family of Taxodium distichum. The coefficient of variation in provenance, the largest among families, followed by individuals. The coefficient of variation of biomass is greater than the amount of growth. No provenance of different provenances, families in different locations there is a clear interaction. Seven elite provenances, pedigrees or tree species (1600,401, Zhongshan fir, 304,502, Jigongshan Taxodium and 701) were selected by multi-trait comprehensive selection method and their growth, biomass, leaf biomass Larger, above-ground biomass / root biomass ratio. The comprehensive index of selection was 13.97% ~ 35.33% larger than the average value and the height of the tree was 11.22% ~ 24.49% larger than the average value, 34.54% larger than that of the local approximate tree species 46.18%, the DBH was 12.81% ~ 48.28% higher than the average, 38.79% ~ 82.42% larger than that of Ipomoea philoxeroides, and the total biomass was 54.59% ~ 110.67 %; Preservation rate is generally higher than the average and the province Jiangning Ipomoea. These fine provenances, pedigrees or tree species can be used in the province and similar areas in Jiangsu Province, timber, protection and ornamental species promotion and application.