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, Cornus 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 February, germinated epigenlly in succession by late March, lasting for a long continuative time. The high growth of one year old seedling of C. sanguinea was maximum (94.13 cm), C. drumondii ranked as the second (93.75 cm), with that of C. racemosa, C. walteri, C. amomum and C. oblique medium. And that of C. florida (41.30 cm) was the least. The growth patterns 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.