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

Soil Science Society of America Journal - Tập 68 Số 1 - Trang 272-281 - 2004
Nevzat Gürlevık1, Daniel L. Kelting2, H. Lee Allen3
1Suleyman Demirel Univ.; Faculty of Forestry; 32260 Isparta Turkey
2Adirondack Watershed Institute, Paul Smith's College Routes 86 & 30, P.O. Box 265 Paul Smiths NY 12970
3Dep. of Forestry; 3108 Jordan Hall, College of Natural Resources, North Carolina State Univ. Raleigh NC 27695

Tóm tắt

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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Soil Science Society of America Journal

Tập 68 Số 1

272-281

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