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在内蒙古东部半干旱地区分别测定了春、秋两季栽植的樟子松苗越冬期间针叶含水量和蒸腾强度的变化，测定了针叶的致死临界含水量并在室内模拟了生理干旱伤害症状以探讨发生冬季生理干旱伤害的可能性．结果表明秋植苗针叶含水量１月份就已降到初始致死含水量以下而春植苗针叶含水量始终显著高于初始致死含水量并顺利越冬．含水量与蒸腾强度的对比表明甚至在冻土期内，针叶仍有某种水分补充来源．模拟实验中出现的针叶伤害症状和秋植苗野外伤害症状一致．结论认为该地区已正常成活的春季造林苗不大可能发生冬季生理干旱伤害．
The changes of water content and transpiration intensity of Pinus sylvestris var.Mongolica planted in spring and autumn were measured in the semi-arid area in the eastern part of Inner Mongolia. The critical water content of coniferous leaves was measured and physiological drought damage symptoms were simulated To explore the possibility of winter physiological drought damage. The results showed that the needle water content of autumn seedlings had dropped below the initial lethal water content in January and the needle water content of spring planting seedlings was always significantly higher than the initial lethal water content and successfully overwintering. A comparison of water content with transpiration shows that there is some source of supplemental water for the needles even during the frozen period. Symptoms of condyloma acuminatum appearing in simulated experiment were the same as those of autumn planting seedlings. The conclusion is that the winter afforestation in normal conditions in this area is not likely to occur physiological drought in winter.