日本柳松(Cryptomeria japonica D.Don)属杉科常绿乔木,原产日本。我国引种始于本世纪初,目前已分布到黄河以南的16个省(区)。上海50年代曾零星引种。1973年秋,日本横滨市赠送本国30株一年生小苗,盆栽培育; 1974年我们又从杭州植物园引入种子,春季盆播。1975年春将二批苗木移栽圃地,目前生长健旺,已郁闭成林。日本柳杉有以下特点: (1)生长快速。近三年来,选代表植株测定生长量(表1)。日本柳杉不仅生长快,而且持续时间长,故能在原产地长成高M米、粗2米的大径材。在上海日本柳杉与国产柳杉、水杉相比,也显示出生长快速的优良特性(表2)。 Japan Liu Song (Cryptomeria japonica D.Don) is a Cunninghamia evergreen tree, native to Japan. The introduction of China began at the beginning of this century, has been distributed to the south of the Yellow River in 16 provinces (regions). Shanghai 50s have sporadically introduced. The autumn of 1973, Japan’s city of Yokohama presented 30 annuals of young seedlings, potted cultivation; in 1974 we introduced seeds from Hangzhou Botanical Garden, potted in spring. In the spring of 1975, two batches of seedlings were transplanted to nurseries. At present, the plants are growing vigorously and have been closed to forests. Japanese cedar has the following characteristics: (1) rapid growth. In the past three years, selected representative plants were measured for growth (Table 1). Japanese cedar is not only growing fast, but also lasts for a long time, it can grow into a native place with a height of M meters and a diameter of 2 meters. Cryptomeria japonica in Shanghai also showed the excellent characteristics of rapid growth compared with domestic cedar, Metasequoia (Table 2).