Energy or nutrient regulation of decomposition: Implications for the mineralization-immobilization response to perturbations |
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Authors: | Ernesto Bosatta Frank Berendse |
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Institution: | 1. Department of Ecology and Environmental Research, Swedish University of Agricultural Sciences, S-750 07 Uppsala, Sweden;2. Department of Landscape Ecology and Nature Management, University of Utrecht, Opaalweg 20, NL-3523 RP Utrecht, The Netherlands |
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Abstract: | A model developed previously to describe the turnover of forest soil nitrogen is modified here to explain the effects of carbon and nitrogen additions on their dynamics. The model, which is structurally very simple, seems to explain correctly, among other phenomena, the negative correlation between N mineralization and CO2 evolution observed in many experimental situations. An important variable used to explain this behaviour is the deficiency factor, which is related to the critical C-to-nutrient ratio and which gives a measure of the C or nutrient deficiency in the substrate with respect to the needs of the decomposers. Ways are discussed in which the model output can be used to explain the observed retention in the soil of fertilizer N added to mature forest soils. |
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