苗圃和造林地的红松苗木,在越冬期间往往发生针叶变红、苗木枯死现象。据调查,这种现象大都发生在没有防寒的苗床南缘和阳坡造林地。在冬季干旱少雪的年份或撤除防寒覆盖物以后,苗木遭遇寒潮袭击,这种现象尤为严重。例如,1982年春辽宁清源县弯甸子林场的苗圃,30亩留床红松幼苗(1-3年生苗),绝大部份苗木针叶枯死、变红或全株死亡,存活的苗木发育也不正常,损失达28万株。 The nursery and afforestation of the Korean pine seedlings, often during the wintering reddish needles, deadwood phenomenon. According to the survey, most of this phenomenon occurred in the southern edge of the seedling bed without cold and the afforestation site of the sunny slope. This is especially the case when seedlings are hit by cold waves in arid and snow-less winter years or with the removal of cold coverings. For example, in the spring of 1982, Qingyuan County, Liaoning Province, Dandianzi field nursery, 30 acres of Korean pine seedlings (1-3 years old seedlings), the vast majority of seedlings dead needles, red or whole plant died, the survival of seedlings also Not normal, the loss of up to 280,000.