Organic matter chlorination rates in different boreal soils: the role of soil organic matter content.
Environ Sci Technol
; 46(3): 1504-10, 2012 Feb 07.
Article
en En
| MEDLINE
| ID: mdl-22191661
ABSTRACT
Transformation of chloride (Cl(-)) to organic chlorine (Cl(org)) occurs naturally in soil but it is poorly understood how and why transformation rates vary among environments. There are still few measurements of chlorination rates in soils, even though formation of Cl(org) has been known for two decades. In the present study, we compare organic matter (OM) chlorination rates, measured by (36)Cl tracer experiments, in soils from eleven different locations (coniferous forest soils, pasture soils and agricultural soils) and discuss how various environmental factors effect chlorination. Chlorination rates were highest in the forest soils and strong correlations were seen with environmental variables such as soil OM content and Cl(-) concentration. Data presented support the hypothesis that OM levels give the framework for the soil chlorine cycling and that chlorination in more organic soils over time leads to a larger Cl(org) pool and in turn to a high internal supply of Cl(-) upon dechlorination. This provides unexpected indications that pore water Cl(-) levels may be controlled by supply from dechlorination processes and can explain why soil Cl(-) locally can be more closely related to soil OM content and the amount organically bound chlorine than to Cl(-) deposition.
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Suelo
/
Cloruros
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Cloro
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Ambiente
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Sustancias Húmicas
País/Región como asunto:
Europa
Idioma:
En
Revista:
Environ Sci Technol
Año:
2012
Tipo del documento:
Article
País de afiliación:
Suecia