Prescribed burning increased nitrogen availability in a mature loblolly pine stand |
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| Institution: | 1. State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin 300387, PR China;2. Institute of Biological and Chemical Engineering, School of Material Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, PR China;1. Laboratório de Ecologia Isotópica, Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, Piracicaba, São Paulo State, Brazil;2. Escola de Engenharia de Piracicaba, Piracicaba, São Paulo State, Brazil;3. Laboratório de Hidrologia Florestal, Escola Superior de Agricultura ‘Luiz de Queiroz’, Universidade de São Paulo, Piracicaba, São Paulo State, Brazil |
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| Abstract: | Prescribed burning is a common management practice in loblolly pine (Pinus taeda L.) ecosystems. Several studies have examined the volatilization losses of nitrogen (N), but little information is available on subsequent availability of N. We examined the effects of a low-intensity prescribed fire in a mature stand of loblolly pine and found no significant reduction in the N content of the forest floor. However, the decomposition rate of the forest floor more than doubled for the first growing season after burning. This decomposition released 60 kg N ha−1 more than measured for an unburned portion of the same stand. Increased N availability was also indicated by analysis of foliage and soil incubations. This pulse of available nitrogen may have a fertilization effect on pine growth and might substitute for late-rotation applications of N fertilizer. |
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