三倍体毛白杨系北京林业大学利用现代育种技术，历经“六五”、“七五”、“八五”三个五年计划培育而成的速生高效用材林品种。为了探索三倍体毛白杨优质壮苗技术，１９９７年我们进行了育苗试验。试验面积０４６ｈｍ２。当年苗木平均胸径２２ｃｍ，平均高３５ｍ，... Triploid Populus tomentosa Department of Beijing Forestry University using modern breeding techniques, after the “Sixth Five-Year”, “Seventh Five-Year”, “Eighth Five-Year Plan” three years of cultivation planted from the fast-growing high-quality timber species. In order to explore the triploid Populus quality strong seedling technology, we conducted a breeding experiment in 1997. Test area 0  46hm2. When the average diameter of seedlings 2  2cm, an average of 3  5m, ...