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苗木是更新造林的物质基础,壮苗、大苗是提高更新成活和保存率的重要因素.由于高山林区具有气温低、温差大、苗木生长期短的特点,制约了苗木的生长发育过程.为了促进苗木的快速生长,缩短出圃年限,在六十年代中期试验研究的基础上,1979年在理县的米亚罗地区又采用塑料大棚育苗(图1).对苗木的生态效应进行了初步观测,研究在人为条件下幼苗的生长发育动态,为进一步采用塑料大棚定向培育苗木提供依据,亦为育苗机械化及工厂化创造有利的条件.
Seedling is the material basis for reforestation, strong seedling and big seedling are the important factors to improve the survival rate and preservation rate of regeneration.However, the characteristics of lowland temperature, large temperature difference and short seedling growth period restrict the growth and development of seedlings. Promote the rapid growth of seedlings, shorten the nursery years, in the mid-60s on the basis of experimental studies, in 1979 in Mi County, Li County, plastic nurseries and re-use of plastic housing (Figure 1) on the ecological effects of seedlings preliminary observations , To study the growth and development of seedlings under artificial conditions, to provide basis for the further cultivation of seedlings by plastic greenhouses, and to create favorable conditions for seedling mechanization and industrialization.