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Are Nitrogen-Fertilized Forest Soils Sinks or Sources of Carbon?
| Content Provider | Semantic Scholar |
|---|---|
| Author | Miegroet, Helga Van Jandl, Robert |
| Copyright Year | 2007 |
| Abstract | We developed a simple conceptual model that tracks nitrogen and carbon jointly through an N fertilized forest ecosystem. The stimulation of growth increases the litterfall and imports substrate for soil microorganisms. Microbial biomass forms according to the supply of C and N. The formation of microbial biomass is accompanied by respiratory C losses. The quantity of CO2 efflux depends on the C use efficiency of microbes. When excess N is available, the microbial activity is accelerated and the demand for substrate is high. Litterfall supplies an insufficient amount of C to the soil. In such a case, labile soil C is mineralized and the net effect of N fertilization is a loss of soil C. A strong N fertilization effect on the aboveground biomass can offset the soil C loss. In the case of a low N dosage or high N losses due to leaching or emission of nitrogen oxides, the soil C loss is small. The conceptual model was applied to a case study. The field data, collected over a time span of several decades, could not support sound conclusions on the temporal trend of soil C because the spatial and temporal variability of the chemical data was high. The conceptual model allowed to give an evaluation of the fertilization effect on soil C based on reproducible principles. |
| Starting Page | 121 |
| Ending Page | 131 |
| Page Count | 11 |
| File Format | PDF HTM / HTML |
| DOI | 10.1007/s10661-006-9410-7 |
| Alternate Webpage(s) | https://page-one.springer.com/pdf/preview/10.1007/s10661-006-9410-7 |
| PubMed reference number | 17180428 |
| Alternate Webpage(s) | https://doi.org/10.1007/s10661-006-9410-7 |
| Journal | Medline |
| Volume Number | 128 |
| Journal | Environmental monitoring and assessment |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
