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Controls over Net Inorganic Nitrogen Transformations in an Age Sequence of Pinus Elliottii Plantations in North Florida

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Abstract:

The controls over net ammonification and net nitrification in recently clearcut, 9-year-old and 29-year-old plantations of Pinus elliottii in north Florida were investigated using a combination of field (in situ) and laboratory soil incubations. Fertilization with PK and NPK and prescribed burning were also used in the field to further determine effects of P and NH+4-N availability on net N transformations. Results revealed complex relationships among N availability and plantation age, incubation method, season and treatment. Ammonification rates were generally lower than those found in other studies. The clearcut, 9-year-old and NPK-fertilized plots had the greatest rates. The single burns and PK-fertilization had little effect on rates, although soil chemistry was significantly altered. Net nitrification rates were negligible except on the NPK-fertilized plots, which had greatly elevated rates of both net ammonification and net nitrification. We conclude that P availability had little apparent affect on net N transformations in the surface soil and that N availability was least in the oldest stand. For. Sci. 35(4):920-934.

Keywords: Florida; Net ammonification; fertilization; net nitrification; nitrogen; phosphorus; prescribed burning; slash pine

Document Type: Journal Article

Affiliations: Professor, Forest Ecology, Department of Forestry, University of Florida, Gainesville, FL 32611-0303

Publication date: December 1, 1989

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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