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无防护的红松越冬苗,早春常发生“红梢”,苗木受到不同程度的为害。同一苗床的不同部位或在不同的覆盖物下,“红梢”程度不同,一般是苗床南侧最重,北侧次之,中部最轻。早春是苗木从休眠逐渐进入复苏的时期,此时太阳辐射逐渐增强,气温迅速回升,苗木生理状况发生变化。“红梢”是环境条件的变化超越了苗木所能忍受的最大限度所致。
Unprotected red pine wintering seedlings, often occur in early spring “red shoots”, nursery stock are subject to varying degrees of damage. Different parts of the same seedbed or in different coverings, “red shoots” of different degrees, generally the heaviest south of the seedbed, north of the second, the lightest in the middle. Early spring is the seedling gradually from recovery to recovery period, when the solar radiation gradually increased, the temperature rose rapidly, the physiological changes in seedlings. “Shoots” is the change of environmental conditions beyond the seedlings can tolerate the maximum.