Carbon dioxide emissions from semi-arid soils amended with biochar alone or combined with mineral and organic fertilizers

Fernández, José M. and Nieto, María Aurora and López de Sá, Esther G. and Gascó, Gabriel and Méndez, Ana and Plaza, César (2014). Carbon dioxide emissions from semi-arid soils amended with biochar alone or combined with mineral and organic fertilizers. "Science of The Total Environment" (n. 482); pp. 1-7. ISSN 0048-9697. https://doi.org/10.1016/j.scitotenv.2014.02.103.

Description

Title: Carbon dioxide emissions from semi-arid soils amended with biochar alone or combined with mineral and organic fertilizers
Author/s:
  • Fernández, José M.
  • Nieto, María Aurora
  • López de Sá, Esther G.
  • Gascó, Gabriel
  • Méndez, Ana
  • Plaza, César
Item Type: Article
Título de Revista/Publicación: Science of The Total Environment
Date: February 2014
ISSN: 0048-9697
Subjects:
Faculty: E.T.S.I. Minas (UPM)
Department: Ingeniería de Materiales [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Semi-arid soils cover a significant area of Earth s land surface and typically contain large amounts of inorganic C. Determining the effects of biochar additions on CO2 emissions fromsemi-arid soils is therefore essential for evaluating the potential of biochar as a climate change mitigation strategy. Here, we measured the CO2 that evolved from semi-arid calcareous soils amended with biochar at rates of 0 and 20 t ha?1 in a full factorial combination with three different fertilizers (mineral fertilizer, municipal solid waste compost, and sewage sludge) applied at four rates (equivalent to 0, 75, 150, and 225 kg potentially available N ha?1) during 182 days of aerobic incubation. A double exponential model, which describes cumulative CO2 emissions from two active soil C compartments with different turnover rates (one relatively stable and the other more labile), was found to fit verywell all the experimental datasets. In general, the organic fertilizers increased the size and decomposition rate of the stable and labile soil C pools. In contrast, biochar addition had no effects on any of the double exponential model parameters and did not interact with the effects ascribed to the type and rate of fertilizer. After 182 days of incubation, soil organic and microbial biomass C contents tended to increase with increasing the application rates of organic fertilizer, especially of compost, whereas increasing the rate of mineral fertilizer tended to suppress microbial biomass. Biochar was found to increase both organic and inorganic C contents in soil and not to interactwith the effects of type and rate of fertilizer on C fractions. As a whole, our results suggest that the use of biochar as enhancer of semi-arid soils, either alone or combined with mineral and organic fertilizers, is unlikely to increase abiotic and biotic soil CO2 emissions.

More information

Item ID: 34041
DC Identifier: http://oa.upm.es/34041/
OAI Identifier: oai:oa.upm.es:34041
DOI: 10.1016/j.scitotenv.2014.02.103
Official URL: http://www.sciencedirect.com/science/article/pii/S0048969714002861
Deposited by: Memoria Investigacion
Deposited on: 25 Feb 2015 08:44
Last Modified: 25 Feb 2015 08:44
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