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塑料大棚育苗可以提高棚内温度和湿度,改善苗木的生态条件,延长生长期,造成适于苗木生长的环境,因此,可以加速苗木生长.见附表.从附表可以看出,塑料大棚育苗在八一实习林场1978—1979年7月的近两年中,普遍地对所培育的几种树种的苗木的生长都有促进作用,尤其对喜光的阳性树种效果更为显著,在高生长方面一般可提高2—3倍(个别较低),直径生长可提高0—150%,对阴性树种云杉的高生长可提高55—180%,直径生长可提高8—50%.
Plastic greenhouse nursery can improve shed temperature and humidity, improve the ecological conditions of nursery stock, extend the growth period, resulting in suitable for the growth of nursery stock, therefore, can accelerate the growth of nursery stock, see the attached table can be seen from the table, plastic nursery stocking In the past two years in the practice farm of Bayi from 1978 to 1979, in the recent two years, it is common to promote the growth of seedlings of several tree species cultivated, especially for the positive species of hi-light. In the aspect of high growth Generally 2-3 times (individual lower), diameter growth can be increased 0-150%, high growth of negative species spruce can increase 55-180%, diameter growth can be increased by 8-50%.