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在我省一些地区的育苗作业中,对苗木生长期的管理比较重视,而对生长后期,特别是越冬期的管理注意不够,不同程度地影响了苗木的质量和产量。应该充分认识低温对苗木的危害性,并相应地采取科学的管理措施,提高苗木抗寒能力,在我省气候寒冷的西山地区尤为重要。低温对苗木的危害,我省较普遍的有两种。一种是冬旱。冬季,常绿树种的苗木,如落叶松、油松、侧柏等,在某些天气条件下,如遇到强烈而持久的大风天气或气温不太低而阳光很充足的晴天,地温和气温差异很大,因为土温很低,苗木地下部分不能吸收水分,而短时很暖的气温引起地上部分蒸腾速率相对提高,使苗木体内水分不能保持正常的平衡,造成生
In some regions of our province, the seedling management has paid more attention to the management of the seedling growth stage, while not paid enough attention to the management of late growth stage, especially during the winter, which affects the quality and yield of seedlings to varying degrees. Should be fully aware of the dangers of low temperature on the seedlings, and accordingly adopt scientific management measures to improve the cold tolerance of seedlings in our province Xixiang cold climate is particularly important. Low temperature damage to seedlings, there are two more common in our province. One is winter drought. Winter, the evergreen tree seedlings, such as larch, Pinus, Platycladus, etc., in some weather conditions, such as strong and lasting strong winds, or the weather is not too low and the sun is abundant, sunny and temperate Because the soil temperature is very low, the underground part of the seedling can not absorb the water, but the short warm air temperature causes the relative transpiration rate of the aboveground part to increase, so that the water in the seedling body can not maintain the normal balance,