南部松树遗传品质得到改良的种子,大多数是从优树上采取接穗,然后嫁接成无性系种子园生产出来的。在优树和接穗的选择方面,人们作了不少研究,但在砧木的选择上很少考虑。不少学者发现,在松树嫁接中,不同的砧木对接株的生长、开花结实影响差异很大。譬如,1970年Holzer 发现,嫁接在欧洲赤松(Psylves-tris)上的瑞士五针松(P.Cembra),生长和开花结实要比嫁接在南欧黑松(P.n-gra),美国五针松(P.strobus).及本砧上的好。 Most of the seeds with improved genetic quality in southern pine are mostly derived from scion trees and then cloned into clonal seed orchards. Much research has been done on the selection of elite trees and scions, but seldom considered on the choice of rootstocks. Many scholars found that in pine grafting, different rootstocks docking plant growth, flowering and fruiting effects vary widely. For example, Holzer found in 1970 that P.Cembra, grafted on Psylves-tris in Europe, grew and flowered more strongly than grafted on Pn-gra, P.strobus). And this anvil on the good.