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Soil Science Society of America Journal Abstract - DIVISION S-7—FOREST & RANGE SOILS

Nitrogen Mineralization Following Vegetation Control and Fertilization in a 14-Year-Old Loblolly Pine Plantation


This article in SSSAJ

  1. Vol. 68 No. 1, p. 272-281
    Received: May 1, 2002

    * Corresponding author(s): keltind@paulsmiths.edu
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  1. Nevzat Gurlevika,
  2. Daniel L. Kelting *b and
  3. H. Lee Allenc
  1. a Suleyman Demirel Univ., Faculty of Forestry, 32260 Isparta, Turkey
    b Adirondack Watershed Institute, Paul Smith's College, Routes 86 & 30, P.O. Box 265, Paul Smiths, NY 12970
    c Dep. of Forestry, 3108 Jordan Hall, College of Natural Resources, North Carolina State Univ., Raleigh, NC 27695


Vegetation control (VC) and fertilization (FR) can change N availability in southern pine plantations, but the magnitude, duration, and reasons for change are not fully understood. The effects of a factorial combination of vegetation control (none vs. complete) and fertilization (none vs. 224 kg N ha−1 and 56 kg P ha−1) on net N mineralization and soil temperature and moisture were investigated in a 14-yr-old loblolly pine (Pinus taeda L.) plantation located on the Piedmont of North Carolina. Net N mineralization and soil temperature and moisture were measured monthly for 2 yr beginning in July 1998, four months after the treatments were applied. A companion aerobic laboratory incubation study of field-moist soil was conducted at 28°C during the second year. Vegetation control increased soil temperature by 1.8°C during the growing season. Both vegetation control and fertilization increased field net N mineralization, and there was a strong positive interaction between the treatments. Net nitrification constituted 72% of net N mineralization for the combined treatment, and only 8% of net N mineralization for the other treatments. Seasonal patterns in net N mineralization were poorly correlated with soil temperature and moisture. The field and laboratory studies showed the same seasonal dynamics and magnitude of annual treatment effects on net N mineralization, suggesting other factors (e.g., labile C inputs) may be important in controlling net N mineralization.

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