柳树适应性强,容易无性繁殖,特别适宜在低湿地造林,是平原地区重要的速生树种.当作为用材树种经营时,往往因干形不良,干材率低而受到限制.为了改良柳树的冠形和干形.提高其干材率,我们开展了柳树良种选育的试验研究,以期选育出适于营造速生用材林的优良无性系,使该树种在平原地区林业生产中发挥更大的效益.J1—75及J4—75是我们较早选育出来的乔木柳速生无性系.从选育试验到初步投入生产造林现近8年时间,其无性系测定林分已达半个轮伐期(速生柳树轮伐期为10年).近几年来江苏徐州、淮阴、南通、扬州和南京等地、市已总计育苗25万多株,造林5万多株.全国也约有14个省、市40多 Willow adaptable and easy asexual reproduction, especially suitable for afforestation in low wetlands, is an important fast-growing species in the plains.When operating as timber species, often due to poor dry, low dry matter rate is limited.In order to improve the willow crown Shape and dry shape.Improve its dry material rate, we conducted a pilot study of willow elite breeding, with a view to breeding suitable for growing fast timber plant clones, so that the tree species in the plains of forestry production to play more effective J1-75 and J4-75 were the earlier we breed Qiaoshengliu clonal clones.From the breeding test to preliminary put into production afforestation for nearly 8 years, the clonal determination of the forest has reached half the rotation period (Fast growing willow rotation period of 10 years.) Xuzhou, Huaiyin, Nantong, Yangzhou and Nanjing in recent years, the city has a total of more than 250,000 nursery plants, afforestation more than 50,000 strains of the country also has about 14 provinces, More than 40 cities