Abstract: Based on the fifth and sixth continuous forest inventories in Inner Mongolia,forest carbon Stock and the dynamic change in sandy area in Inner Mongolia have been calculated.The results show that in Inner Mongolia,the total carbon stock of forest trees in sandy area is 48.9805 million tons(Mt),among them,the total carbon stock in sandy land is 46.1485 Mt and the one in desert is 2.832 Mt.Form 2003 to 2008,the net increase of total carbon stock of forest trees in sandy area in Inner Mongolia is 9.2107 Mt,with an average net increase of 1.8421 Mt per year.In Inner Mongolia,the total carbon dioxide fixed by forest trees is 6.7544 Mt in sandy area,taking up 2.36 percent of the annual release of carbon dioxide.

Key words: forest tree, carbon storage, dynamic change, sandy area, Inner Mongolia