Influence of source and quality of plant residues on emissions of N2O and CO2 from a fertile, acidic Black Vertisol
| Autor: | Graeme Schwenke, Christopher Guppy, David F. Herridge, Nazma Begum |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Denitrification
food.ingredient biology Chemistry food and beverages Soil Science Vertisol equipment and supplies Sorghum biology.organism_classification Microbiology chemistry.chemical_compound Animal science food Agronomy Shoot Dissolved organic carbon Carbon dioxide Canola Agronomy and Crop Science Incubation |
| Zdroj: | Biology and Fertility of Soils. 50:499-506 |
| ISSN: | 1432-0789 0178-2762 |
| Popis: | Few studies have compared emissions of nitrous oxide (N2O), the potent greenhouse gas associated with decomposition of both below-ground (root) and above-ground (shoot) residues. We report a laboratory incubation experiment to evaluate effects of root and shoot residues from wheat, canola, soybean, and sorghum, incorporated into a naturally fertile acidic Black Vertisol, on N2O and carbon dioxide (CO2) emissions. The residue-amended Vertisol samples were incubated at 25 °C and 70 % water-filled pore space (WFPS) to facilitate denitrification activity for a total period of 56 days. The incubated soils were periodically sampled for N2O, CO2, mineral N, and dissolved organic carbon (DOC). In general, shoot residues emitted more CO2 than roots, while N2O emissions were 50–70 % higher in cereal root residues than those in shoots. Surprisingly, the highest N2O emissions were associated with soils amended with the more inert high C/N ratio residues (wheat and sorghum roots), and to some extent, lowest emissions were associated with low C/N ratio (more labile) residues, particularly during the early stages of incubation (0–22 days). During this stage, there was a significant (p |
| Databáze: | OpenAIRE |
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