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2004—2007年对长白山阔叶红松林林地进行遮雪试验,观测了有雪、无雪覆盖的森林土壤温度和气温.结果表明:积雪对土壤温度变化有明显的缓冲作用,有雪覆盖减缓了土壤温度的变化;积雪对浅层(0～20cm)土壤有较好的保温作用,随雪深的增加,保温作用增大,雪深从10cm增至20cm时保温作用的增幅最大,当雪深超过30cm时,保温作用的增幅不明显;融雪期土温经历0℃左右的恒温期后缓慢上升,恒温期的持续时间主要由冬季的雪深及其时间分布所决定.
Snow cover experiment was conducted on broad-leaved Korean pine forest in Changbai Mountain from 2004 to 2007. The temperature and temperature of forest soil with or without snow covered with snow were observed.The results showed that snow cover had obvious buffer effect on soil temperature change, (0-20 cm) soil had better heat preservation effect. With the increase of snow depth, the heat preservation effect increased. When the snow depth was increased from 10 cm to 20 cm, the heat preservation effect increased most greatly. When the snow depth increased from 10 cm to 20 cm, When the depth of snow exceeded 30cm, the increase of heat-preservation effect was not obvious. Soil temperature in thawing season rose slowly after constant temperature period of 0 ℃. The duration of constant temperature period was mainly determined by the depth of snow and its time distribution in winter.