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在杉木北缘区苏南低山丘陵江宁、句容两试点的观测研究表明：从优良种源间杂交组合子代幼林、优树半同胞子代幼林以及优良种源超级苗木群体中，选择优良单株无性系和优良种源超级苗无性混合群体，早期均有选择增益。在３年生时，从４５个参试无性系中初选出的１４个无性系，其树高早期选择增益达３．４％～４８％，比对照融水种源群体无性系苗生长量高４６％以上。而选择了融水、会同，江华优良种源超级苗无性混合群体造林，分别比当地对照树高增加５０．８％，４９．７％和５７．８％
In the northern fringe of the southern fringe of southern Jiangsu Jiangning, Jurong two pilot observations show that: from good provenances hybrids offspring of young offspring, elite half-sibling young seedlings and super-elite seedling population, choose excellent Single clonal and superior provenance Miao clonal asexual groups, early have a selective gain. At the age of 3 years, 14 clones selected from 45 clones had higher tree selection gain (3.4% ~ 48%) than that of the control group More than 46%. The selection of meltwater, together with, Jianghua super-seedling asexual mixed seedling mixed group afforestation, respectively, than the local control tree height increased by 50.8%, 49.7% and 57.8%