Abstract
Publisher Summary This chapter examines nitrogen fixation in the component parts of a flooded soil system: the water column and soil surface, the aerobic soil layer, the anaerobic soil layer, the plant root zone (rhizosphere), and the leaf and stem surface of plants. Flooded soil systems tend to be more favorable sites for nonsymbiotic nitrogen fixation than well-drained soils. Many of the characteristic features of flooded soils indicate the suitability of these systems for nitrogen fixation. Their poor aeration suggests a favorable environment for fixation because nitrogenase, the enzyme system that catalyzes nitrogen fixation, is oxygen sensitive. The near neutral pH and low redox potential found in most flooded soils are apparently favorable for heterotrophic nitrogen fixation. Nitrogen-fixing blue-green algae can readily proliferate in the photic zone of flooded soil systems. The chapter discusses the environmental factors influencing fixation and the assumptions and limitations associated with the indirect acetylene reduction assay as compared with the direct I5N method for fixation in flooded soils
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