当年苗木超过出山标准,每公顷产苗量达七七○万株,比过去提高二.五倍长白山林区地势高寒,无霜期短,植物生长季节平均100天左右,因此林区落叶松育苗受自然环境条件及技术措施的限止,当年生苗木平均高不足5公分。第三年春才能出圃造林:同时单位面积产量低,每平方公尺产苗500-600株。吉林省林业 Year seedlings over the standard out of every hectare production of 700000 seedlings, increased by 2.5 times than in the past, Changbai Mountain forest terrain alpine, frost-free period is short, the average growth season of plants about 100 days, so the forest larch nursery by the natural Environmental conditions and technical measures to limit the average annual seedlings less than 5 cm high. In the third year of spring, we can plant nurseries: at the same time, the yield per unit area is low, yielding 500-600 plants per square meter. Jilin Province Forestry