我省西部干旱盐碱地区樟子松造林保存率很低,使这一地区形成了许多樟子松疏林.究其原因,主要是因为这一地区晚秋至早春之间生理干旱现象严重所致.人们虽然知道做“防寒”工作(在晚秋时节用土将小苗培严,春来将土撤去防止生理干旱),但是在具体工作中,由于“防寒”的年限、培 The low preservation rate of Pinus sylvestris var. Mongolica in arid saline area in the western part of our province resulted in the formation of many Pinus sylvestris var. Mongolica in this area. The reason is mainly due to the serious physiological drought in the area from late autumn to early spring. Although people know that doing “cold work” (in the late autumn season soil will be strict seedlings, spring to remove the soil to prevent physiological drought), but in specific work, due to “cold” years, training