不同地温对3种针叶树播种育苗效果的影响

Effects of Different Ground Temperature on Sowing and Seedling Raising of 3 Coniferous Species

以红松、日本落叶松、红皮云杉3个针叶树种为对象,研究了不同地温对种子出苗及幼苗生长的影响。结果表明:红松在地温3℃和5℃时播种,出苗率和保苗率均较高,日本落叶松、红皮云杉在地温为5℃和7℃时播种出苗率和保苗率较高;3个树种在地温3℃和5℃时播种,当年及翌年苗高和地径均大于7℃、9℃、11℃的苗高和地径;3个树种在地温3℃和5℃时播种,当年幼苗经越冬防寒翌年无冻害且保存率较高,地温7℃、9℃、11℃时播种,表现出轻微冻害。

Three conifer species,Pinus koraiensis,Larix kaempferi and Picea koraiensis,were used to study the effects of different ground temperature on seed emergence and seedling growth.The results showed that the seedling emergence rate and seedling retention rate of Pinus koraiensis were higher when the soil temperature was 3℃and 5℃,and the seedling emergence rate and seedling retention rate of Larix kaempferi and Picea koraiensis were higher when the soil temperature was 5℃and 7℃.When the ground temperature was 3℃and 5℃,the height and diameter of the seedlings in the same year and the following year were higher than 7℃,9℃and 11℃.When the ground temperature was 3℃and 5℃,the seedlings were protected from cold by overwintering,and there was no frost damage in the second year and the survival rate was high,when soil temperature was 7°C,9℃and 11℃,it showed slight freezing injury.