华北落叶松幼苗生长与地温的关系

Relationship between the Growth of Larch Seedlings and Temperature

研究了地表和５，１０，１５，２０，２５ｃｍ土壤温度对１年生华北落叶松苗高、叶长、地径和根系生长的影响。结果表明：①在试验地条件下，地表温度在２０℃～３５℃，５ｃｍ～２５ｃｍ土壤温度在１５℃～２０℃范围内，温度越高，越有利于苗高和叶的生长。

The effects of temperature of the surface,5,10,15,20,25 cm under the surface of soil to the growth of the seedling height,the leaf length,the stem basal diameter and the root system of the annual Larix principis rupprechtii was studied The results showed that:(1) At the condition that the surface temperature was 25℃～35 ℃ and temperature of soil 5 cm～25 cm under the surface was 15℃～20℃,the higher the temperature was,the better the seedling grew (2)The soil temperature which was advantageous to the growth of the nursery stock's basal diameter and root system was between 15℃～25℃