Short and long-term effects of prescribed underburning on nitrogen availability in ponderosa pine stands in central Oregon Public Deposited

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  • The effects of prescribed underburning on soil total C pools, total and inorganic N pools, and in situ net N mineralization were examined during a 1-year study in ponderosa pine (Pinus ponderosa Dougl. ex P. & C. Laws.) sites that had been experimentally burned 4 months, 5 years, or 12 years earlier. At the sites burned 4 months previously, total C concentration and inorganic N concentration increased significantly (p < 0.1) after prescribed burning, compared with unburned controls. However, inorganic N concentration declined during the 1-year duration of this study to reach the levels of the control plots at the end of the second growing season. At the site burned 5 years previously, total C and N concentrations, inorganic N concentration, and net N mineralization decreased significantly after prescribed burning. At the sites burned 12 years previously, N and C pools were not affected, but net N mineralization decreased significantly after burning. The decrease in net N mineralization is likely caused by a decrease in substrate quantity 5 years after burning, and by changes in substrate quality 12 years after burning. A long-term decrease in net N mineralization in the N-poor ponderosa pine stands of central Oregon may result in a decrease in long-term site productivity and may explain the observed pattern of long-term decrease in stand growth after prescribed burning.
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  • Monleon, V.J., K. Cromack, Jr., and J.D. Landsberg. 1997. Short and long-term effects of prescribed underburning on nitrogen availability in ponderosa pine stands in central Oregon. Canadian Journal of Forest Research 27(2): 369-378.
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  • description.provenance : Made available in DSpace on 2010-02-04T23:22:34Z (GMT). No. of bitstreams: 1 Monleon_etal97.pdf: 129327 bytes, checksum: 3fe4d82606d598bbead2c8b6170e0c8b (MD5) Previous issue date: 1997-02
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