That might turn out to be a feature - more carbon in the winter and less in the summer could = smoothing out seasonal variation, if my wild speculation is corre

That might turn out to be a feature - more carbon in the winter and less in the summer could = smoothing out seasonal variation, if my wild speculation is correct. At any rate, I don't see how you could turn a desert or a field into a high biomass forest without sucking up lots of CO2. Of course, once it's full-grown it will be in equilibrium, losing carbon as fast as it gains it.