水杉、池杉、落羽杉都是珍贵的速生用材树种,引种栽培的实践证明,这些树种适宜在我国长江以南的平原、河渠旁和湖滨地区广泛栽培。但是,目前种子来源少,扦插繁殖是主要方法。春、夏、秋三季均能扦插,而夏季嫩枝扦插是充分利用废条,扩大三杉苗木繁殖的有效方法。现将主要技术措施简介如下: Metasequoia, Ipomoea japonica, Taxodium distichum are precious species of fast-growing timber, the introduction of cultivation practice has proved that these species are suitable for our country in the south of the Yangtze River plains, riverside and lake area widely cultivated. However, the current source of less seed, cutting propagation is the main method. Spring, summer and autumn can cut the three quarters, while the summer shoots are full use of scrap, expanding the effective method of seedling propagation. Now the main technical measures are as follows: