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榆树是江苏沿海地区主要乡土树种之一,其中又以自榆所占的比例较大.但白榆生长较慢,侧枝多而粗大,主干不够通直,尖削度也大,其利用率和商品价值均受到一定的影响.我站于1981年春引进3支白×春的枝条进行嫁接,1983年春从山东引进鲁榆杂1号、鲁榆杂2号、白×黄、鲁榆选1号四个系号,计400株苗木进行造林试验,1984年春又引进各榆杂4号、鲁榆杂5号两个系号;1983、1984年计营造试验林27亩.其中如东县林业站13亩,盐城市农科所新洋农业试验站5.5亩,本站内8.5亩,其他林业场、圃亦有少数零星栽植,经过短期的栽培试验.杂交榆已表现出明显的优良显性性状.在试验的同时,还进行了苗木繁殖:1981年保存30株.1982年44株,1983年接活2740株,1984年又接活10346株,计繁殖杂交榆树苗13160株.1984年开始引进嫁接的鲁榆杂4号(活334株),鲁榆杂5号(活30株)两个系号,株数尚少.现将试验情况初报如下:
Elm is one of the main native tree species in the coastal areas of Jiangsu Province, of which the proportion of self-elm accounts for a large proportion, but Elm elm grows slowly with more and more collateral branches, less straight trunk and sharp taper, The value of the goods are subject to certain effects.I stood in the spring of 1981 introduced three white × spring branches for grafting, the spring of 1983 from Shandong introduced Luyu hybrid 1, Luyu hybrid 2, white × yellow, Lu Yu election on the 1st Four lines, planted 400 seedlings afforestation test, the spring of 1984 and the introduction of each Yuza 4, Yuyu hybrid 5 two system number; 1983, 1984 plan to build 27 acres of experimental forest which Rudong Forestry Station 13 acres, Yancheng Agricultural Science Xinyang Agricultural Experimental Station 5.5 acres, the site 8.5 acres, other forestry fields, nursery also a small number of sporadic planting, after a short period of cultivation experiments. Hybrid elm has shown significant superior dominant traits At the same time, seedling propagation was also carried out: 30 strains were preserved in 1981. 44 strains in 1982, 2740 strains in 1983, 10,346 strains in 1984, and 13,160 hybrid elm seedlings were planted. Grafted Luyu hybrid 4 (live 334), Luyu hybrid 5 (live 30) two lines, the number of strains is still small. as follows: