我局从1956年起,由东北引进樟子松,进行育苗造林试验,10多年来在这方面积累了一些经验。一般3年生出圃苗苗高25厘米,地径0.4厘米,亩产25万株左右。在黄土盖砂地定植,10年生平均高217厘米,地径4.82厘米,比同期栽植的油松分别高10.7％和0.4％(见表1)。 Since 1956, our bureau has introduced Pinus sylvestris from northeast China for nursery and afforestation experiments. Over the past 10 years, we have accumulated some experience in this field. Generally 3-year-old nursery Miao height 25 cm, diameter 0.4 cm, about 250,000 mu per mu. In loess-covered sandy land, the 10-year-olds averaged 217 centimeters high with a mean diameter of 4.82 centimeters, which was 10.7% and 0.4% higher than that of Pinus tabulaeformis planted in the same period (Table 1).