大叶榆引种驯化试验

Test on Introduction and Domestication of Ulmus laevis

通过大叶榆引种繁育及山地造林试验，提供了一整套大叶榆育苗、苗期管理繁育和山地造林技术．大叶榆嫩枝扦插繁殖最佳组合为300mg·kg^-1ABT1^#处理2h，插穗顶部留有一个完整的单片叶，扦插基质为河沙，其扦插平均生根率最高，可达89％；在引种区表现出明显的生长优势，6a生平均树高、平均胸径和平均冠幅分别为5．93m，4．97cm和2．05m．6a生最大的单株树高、胸径和冠幅分别为7．86m，7．4cm和2．46m；在引种区表现出较强的适应性和抗性，6a生没有冻害及病虫鼠害发生．

The cultivating seedlings, breeding and afforestation of Ulmus laevis were provided based on the test of Ulmus laevis introduction and afforestation. The optimum condition of trend branch cutting propagation of Ulmus laevis was 300 mg · kg^- 1, ABT1^# was treated with 2 hours, a complete single leave was retained on the top of cutting, the cutting base was sand, its average rooting rate was the most highest, reached 89% ; Ulmus laevis presented obvious growth advantage in the introduction district, the average height, DBH, crown width of 6 a were 5.93 m, 4.97 cm and 2.05 m respectively. The height, DBH, crown width of the biggest single 6 a were 7.86 m, 7.4 cm and 2.46 m respectively; Ulmus laevis presented stronger resistance and adaptability in the introduction district, 6 a Ulmus laevis had no cold damage and pest disease.