Ecosystem Biogeochemistry pp 31-40 | Cite as
Microbial Biogeochemistry
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Abstract
The biogeochemical cycles of carbon, nitrogen, and sulfur are characterized by important gaseous pathways, biochemical transformations, immobilization processes, and mineralization reactions associated with microbial metabolism. Microbial organisms are thus important regulators of the source-sink behavior and cycling rates of these key elements in terrestrial and aquatic ecosystems. In addition, numerous other elements such as mercury, iron, and even phosphorus are affected directly or indirectly by microbial exudation, respiration, assimilation, oxidation-reduction, methylation, and acidification processes. Taken as a whole, microscopic bacteria and fungi have critical roles in controlling element cycles in the biosphere. The primary focus of this chapter is to explore the major microbial processes and associated environmental conditions influencing the biogeochemical behavior of nitrogen, sulfur, and carbon in the forest landscape.
Keywords
Controlling Element Cycles Dissimilatory Nitrate Reduction To Ammonium (DNRA) Microbial Nitrogen Transformations Gaseous Nitrogen Species Final Oxidation StateReferences
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