Notes: Rates of Free-Living Nitrogen Fixation in Some Piedmont Forest Types

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We examined rates of free-living (nonsymbiotic) nitrogen fixation in a successional sequence of forest types in the Piedmont of North Carolina. Annual nitrogen input through this process did not differ among ecosystems, averaging roughly 0.002 kg/ha annually. The rate in a 20- to 30-year-old stand did not increase with irrigation or additions of nitrogen, phosphorus, or molybdenum. Free-living nitrogen fixation in these forests should not be expected to compensate for nitrogen losses through natural processes or management activities. For. Sci. 33(2):548-551.

Keywords: Acetylene reduction; loblolly pine; nitrogen cycling

Document Type: Miscellaneous

Affiliations: Assistant Professor of Forest Ecology and Soils, School of Forestry and Environmental Studies, Duke University

Publication date: June 1, 1987

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