一、问题的提出及其紧迫性自古我省就有栽杨种柳的习惯。建国以来,特别是十一届三中全会之后,又引种了大量速生新品种,杨树发展极为迅速,并成为全国杨树4大片之一。目前我省杨树有300多个品种,分属于4个派(欧美派即黑杨派、白杨派、小观派和青杨派),黑杨派和白杨派占全省杨树总量的98％以上。 First, the issue put forward and its urgency Since ancient times, there have been planted Yangliu Liu habits. Since the founding of the People’s Republic of China, especially after the Third Plenary Session of the 11th CPC Central Committee, a large number of new varieties of fast-growing new species have also been introduced. The development of poplar is extremely rapid and has become one of the four major poplar poplars in China. At present, there are more than 300 varieties of poplar in our province, belonging to 4 schools (Populus, Poplar, Petite and Populus) in Europe and the United States, black poplar and poplar which account for the total amount of poplar More than 98%.