Comparing current chemical methods to assess biochar organic carbon in a Mediterranean agricultural soil amended with two different biochars
| Autor: | Vicenç Carabassa, Irene Raya-Moreno, Josep M. Alcañiz, Rosa Cañizares, Xavier Domene |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Total organic carbon Environmental Engineering Soil organic matter 04 agricultural and veterinary sciences 010501 environmental sciences 01 natural sciences Pollution Vineyard chemistry Agronomy Environmental chemistry Loam Soil water Biochar 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental Chemistry Organic matter Acid hydrolysis Waste Management and Disposal 0105 earth and related environmental sciences |
| Zdroj: | The Science of the total environment. 598 |
| ISSN: | 1879-1026 |
| Popis: | Several methods have been proposed to quantify biochar C recalcitrance but their suitability is questionable. The aims of this work are: i) to compare the suitability of thermal or chemical oxidation and acid hydrolysis methods to quantify biochar C-pool in a biochar-amended soil, and ii) to calculate the biochar content in the soil through a mass balance derived from the obtained data. Two contrasted biochars from pine wood and corn cob remains were incorporated at a rate of 5 Mg C ha − 1 to a sandy loam vineyard soil with neutral pH and low organic carbon content, in field conditions. The analytical methods used to determine the oxidability and hydrolyzation of soil and biochar-C were: i) weight loss-on-ignition (LOI) at three temperatures (375 °C, 550 °C and 950 °C) for the assessment of organic matter, and ii) dry-combustion (TOC), strong (sO) and mild (mO) acid potassium dichromate oxidations, acid hydrolysis (AH) and peroxide oxidation (PO) for the assessment of organic C-pools. mO mainly estimated the easy oxidisable organic fraction of soil. Resistant organic carbon (ROC), estimated as non-hydrolysable organic carbon by AH and as non-oxidisable by mO, led to similar values in control soil (5 g C kg − 1 soil), whereas different ROC values were obtained in soils amended with biochar (6–12 g C kg − 1 soil). The suitability of these different methods as proxies to quantify biochar C was verified through a mass balance observing differences between them. PO removes well native soil organic matter, but also attacks partially biochar's fraction, so an underestimation exists. However, mO leaves intact biochar in the amended soil. Summarising, LOI, TOC and mO were the best proxies for biochar-C quantification, especially the last one, somewhat clarifying the debate on this topic. |
| Databáze: | OpenAIRE |
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