大兴安岭阿木尔森林火灾区积雪分布特征调查

An Investigation on the Distribution of Snow Cover in the Burned Forest Region of Amue of Da Hinggan Ling

调查表明,沼泽地积雪厚度大于坡地;在不同植被的火烧地段雪盖的厚度大于天然地段约3cm;本区积雪厚度最大时达60 cm以上。积雪密度特征表现在火烧区大于天然区,其中裸露地为最大。经过算,积雪厚度约30 cm时对地面的增温效应(即升高地面年平均温度值)约为2.8—5.0℃。

Through the investigation of the thickness and density of snow cover in winter at different geomorphologic positions and vegetation zones in Amue forest fire area of Da Hinggan Ling, northeastern China, the snow thickness on swamp-land is thicker than on slope, and that on burned site is 3 cm thicker than on unburned site in the same forest zone. The maximum accumulated snow cover in this region is about 60 cm. The snow density on burned site is bigger than on unburned site, it is the biggest on uncovered site. According to calculation, the increased amount of mean annual ground surface temperature by snow cover with about 30 cm thickness is 2.8-5.0℃.