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江苏省东善桥林场,在57年培育的某些一年生实生苗中,于冬季掘苗时发现部分苗木根部的自然密接而愈合的现象,这些树种有杨树(Popules adenopoda)(图1、2),喜树(Com-ptotheca acumimata)及胡桃(Juglans regia)等(其中杨树原系场中与南京林学院合作育苗试验用),这些苗木除了胡桃有56年冬播和57年春播的以外,皆是57年春播的,一年生的苗木高度杨树在55厘米左右,喜树在60厘米左右,胡桃在25厘米左右,其根际直径杨树一
In Dongshengqiao Forest Farm of Jiangsu Province, in some annual perennial seedlings cultivated in 57 years, some natural seedlings were found close to each other and healed during seedling digging in winter. These species include Popules adenopoda Com-ptotheca acumimata and Juglans regia (among them, Yangling was used for nursery experiment with Nanjing Forestry College in the original farm), except for the 56-year winter sowing of walnut and the spring sowing of 57-year spring Is 57 years of spring sowing, annual height of about 55 cm of poplar seedlings, like a tree about 60 cm, about 25 cm walnuts, the root diameter of a poplar