The Biogeochemistry of Chlorine in Soil

The chlorine-cycle in soil is described from a budget-perspective focussing on the interaction between organic and inorganic chlorine. The concentration and storage of organically bound chlorine and chloride in soil and vegetation is estimated for various eco-systems. The origin of the chloride and organic chlorine in soil is considered and major sinks and sources are pin-pointed and estimated. Processes causing formation of organic chlorine (consumption of chloride) and mineralisation of organic chlorine (release of chloride) are discussed. It is shown that the extent of organic chlorine turnover is likely to influence the geochemical cycling of chloride. A rough global budget of the chlorine cycle is outlined at the end of this paper.

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