The Earth system and the cycling of carbon and nutrients - Fundamentals of the Physical Environment - page 521

Plate 21.2 Forest fires cause a leakage of carbon, nitrogen and sulphur from the ecosystem as gases in smoke, but mineral
nutrients like potassium, calcium and magnesium are concentrated in the ash.
Photo: British Columbia Department of Forestry
Plate 21.3 An eddy covariance tower measuring carbon
fluxes in the boreal forest of European Russia.
Photo: Jon Lloyd