This is correct, even for Arctic regions. According to [1], net production of carbon in Alaskan Arctic regions is about 0.14 kg / meter-squared, per year. But

This is correct, even for Arctic regions. According to [1], net production of carbon in Alaskan Arctic regions is about 0.14 kg / meter-squared, per year. But soil content is about 14 kg / meter-squared. Crudely, that means 100 years of net carbon production would be sequestered in soil carbon. [1] http://www.biogeosciences.net/11/4271/2014/ http://www.biogeosciences.net/11/4271/2014/