Relationships among litterfall, fine-root growth, and soil respiration for five tropical tree species
Although significant advances have been made in understanding terrestrial carbon cycling, there is still a large uncertainty about the variability of carbon (C) fluxes at local scales. Using a carbon mass-balance approach, I investigated the relationships between fine detritus production and soil respiration for five tropical tree species established on 16-year-old plantations. Total fine detritus production ranged from 0.69 to 1.21 kg C·m–2·year–1 with significant differences among species but with no correlation between litterfall and fine-root growth. Soil CO2 emissions ranged from 1.61 to 2.36 kg C·m–2·year–1 with no significant differences among species. Soil respiration increased with fine-root production but not with litterfall, suggesting that soil C emissions may depend more on belowground inputs or that both fine root production and soil respiration are similarly influenced by an external factor. Estimates of root + rhizosphere respiration comprised 52% of total soil respiration on average, and there was no evidence that rhizosphere respiration was associated with fine-root growth rates among species. These results suggest that inherent differences in fine-root production among species, rather than differences in aboveground litterfall, might play a main role explaining local-scale, among-forest variations in soil C emissions.
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| Format: | Texto biblioteca |
| Language: | eng |
| Published: |
National Research Council of Canada Canadá
2007
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| Subjects: | HYERONIMA ALCHORNEOIDES, PENTACLETHRA MACROLOBA, PINUS PATULA, VIROLA KOSCHNYI, VOCHYSIA GUATEMALENSIS, ARBOLES, HOJARASCA, RAICES, CRECIMIENTO, RESPIRACION DEL SUELO, CICLO DEL CARBONO, CARBONO, BIOMASA, MEDICION, MODELOS, ECUACIONES ALOMETRICAS, ESTACION BIOLOGICA LA SELVA, TREES, LEAF FALL, FOREST LITTER, ROOTS, GROWTH, CARBON CYCLE, CARBON, BIOMASS, MEASUREMENT, MODELS, CARBONE, BIOMASSE, MESURE, |
| Online Access: | https://cdnsciencepub.com/doi/abs/10.1139/x07-057 |
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