How do changes in bulk soil organic carbon content affect carbon concentrations in individual soil particle fractions?
| Autor: | W. D. Reynolds, X. M. Yang, J.Y. Yang, Craig F. Drury |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Total organic carbon
Multidisciplinary 010504 meteorology & atmospheric sciences Soil test Bulk soil chemistry.chemical_element Soil science 04 agricultural and veterinary sciences Silt 01 natural sciences Article chemistry Loam Environmental chemistry 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Particle Size fractions Carbon 0105 earth and related environmental sciences |
| Zdroj: | Scientific Reports |
| ISSN: | 2045-2322 |
| DOI: | 10.1038/srep27173 |
| Popis: | We test the common assumption that organic carbon (OC) storage occurs on sand-sized soil particles only after the OC storage capacity on silt- and clay-sized particles is saturated. Soil samples from a Brookston clay loam in Southwestern Ontario were analysed for the OC concentrations in bulk soil, and on the clay (−1 soil. The OC concentrations on all three particle size fractions were significantly related to the OC concentration of bulk soil. However, OC concentration increased slowly toward an apparent maximum on silt and clay, but this maximum was far greater than the maximum predicted by established C sequestration models. In addition, significant increases in OC associated with sand occurred when the bulk soil OC concentration exceeded 30 g C kg−1, but this increase occurred when the OC concentration on silt + clay was still far below the predicted storage capacity for silt and clay fractions. Since the OC concentrations in all fractions of Brookston clay loam soil continued to increase with increasing C (bulk soil OC content) input, we concluded that the concept of OC storage capacity requires further investigation. |
| Databáze: | OpenAIRE |
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