自从1961年有人提出用植苗枪造林(请参阅本刊1962年10期)以来,加拿大对带土苗造林很感兴趣。虽然近来大部分兴趣集中于植苗枪,但当前的主要问题是塑料弹壳内育出的苗在田间的成活与生长是否合乎要求。为此,有几个单位在阿尔伯达省的山区于1962、1963年合作进行了云杉和松 Since 1961 some people have proposed afforestation with seedlings guns (see Issue 10 of 1962), Canada is very interested in planting seedlings. Although much interest has recently been focused on seedling guns, the current major issue is whether the survival and growth of seedlings spawned in plastic shells is satisfactory in the field. To this end, several units in the mountains of Alberta were cooperated in 1962 and 1963 with spruce and pine