苗木密度与追肥次数对苗木质量有显著的影响,为了进一步掌握二者之间的关系制定高寒山区大青杨育苗的有效措施,在1991年春季进行了试验。于6月23日蒴果微黄时,在北大秧苗圃附近采集,采后即行播种。在苗木出齐后,侧根长出4～5个时间苗,时间大约7月20日,并在各样方内定 In order to further understand the relationship between the seedling density and the number of topdressing seedlings have a significant impact on the development of effective measures to raise young Populus euphratica in the alpine mountains in the spring of 1991 were tested. When the capsule was yellowish on June 23, it was collected in the vicinity of Beida Dayang Nursery and sowed after harvesting. After the seedlings alike, the lateral root grow 4 to 5 time seedlings, the time is about July 20, and set in various parties