7种梾木苗期育苗试验初报

对7种梾木属植物的种实性状、休眠解除、1年生幼苗生长动态及适应性进行了试验研究。6种外来梾木属植物种实经360 d的低温沙藏处理后基本解除休眠,发芽率82%~93%,毛梾种实含油量高,低温沙藏催芽处理89 d后的种实发芽率为45%。低温处理后的种实每年2月中下旬开始萌动,3月中下旬陆续出土,发芽持续时间15~20 d,为出土萌发。1年生苗平均高生长量以欧洲红瑞木最大(94.13 cm),其次是粗叶梾木(93.75 cm);圆锥梾木、毛梾、熊果梾木和斜叶梾木1年生苗高生长量中等,当年高生长量分别为80.62,78.42,77.81 cm和77.63 cm;多花梾木1年生苗平均高生长量最小(41.30 cm),初期生长速度较慢。熊果梾木、斜叶梾木、圆锥梾木、粗叶梾木、欧洲红瑞木、毛梾6树种的高生长曲线十分接近,S型曲线非常明显,属于前期生长型;多花梾木的年高生长非常小,S型曲线变化不十分明显。7种植物表现出较强的抗逆性,适于在我国南方引种育苗和扩大栽培。

Preliminary study on the seedling stage test of seven dogwoods

The seed character, dormancy breaking, high growth dynamic of one year old seedling and adaptability of, Coro nus amomum, C. oblique, C. racemosa, C. drumondii, C. florida, C. sanguinea and C. walteri, were studied by test. Results showed that seed dormancy of six alien trees were basically broken after 360 days＇low temperature sand treatment, and their seed germination rate ranged 82% ~93% ,with that of C. walteri （native） 45%, as its seed oil content was high even though seeds went through the same process. The seeds by cold stratification generally began budding in late Februar- y, germinated epigenlly in succession by late March, lasting for a long eontinuative time. The high growth of one year old seedling of C. sanguinea was maximum（94.13 em） , C. drumondii ranked as the second（93.75 cm） ,with that of C. race- mosa, C. walteri, C. amomum and C. oblique medium. And that of C. florida（41.30 em） was the least. The growth pat- terns of C. amomum , C. oblique, C. racemosa , C. drumondii , C. sanguinea and C. walteri , featured as obvious S-curve, but that of C. florida was not evident. All of 7 species of trees showed strong resistance or tolerance to environmental stress, and therefore had wide prospects of application.