Medium-term effects of corn biochar addition on soil biota activities and functions in a temperate soil cropped to corn
Domene, Xavier (Xavier) (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)
Mattana, Stefania (Centre de Recerca Ecològica i d'Aplicacions Forestals)

Data:	2014
Resum:	Biochar addition to soil has been generally associated with crop yield increases observed in some soils, and increased nutrient availability is one of the mechanisms proposed. Any impact of biochar on soil organisms can potentially translate to changes in nutrient availability and crop productivity, possibly explaining some of the beneficial and detrimental yield effects reported in literature. Therefore, the main aim of this study was to assess the medium-term impact of biochar addition on microbial and faunal activities in a temperate soil cropped to corn and the consequences for their main functions, litter decomposition and mineralization. Biochar was added to a corn field at rates of 0, 3, 12, 30 tons ha−1 three years prior to this study, in comparison to an annual application of 1 t ha−1. Biochar application increased microbial abundance, which nearly doubled at the highest addition rate, while mesofauna activity, and litter decomposition facilitated by mesofauna were not increased significantly but were positively influenced by biochar addition when these responses were modeled, and in the last case directly and positively associated to the higher microbial abundance. In addition, in short-term laboratory experiments after the addition of litter, biochar presence increased NO2 + NO3 mineralization, and decreased that of SO4 and Cl. However, those nutrient effects were not shown to be of concern at the field scale, where only some significant increases in SOC, pH, Cl and PO4 were observed. Therefore, no negative impacts in the soil biota activities and functions assessed were observed for the tested alkaline biochar after three years of the application, although this trend needs to be verified for other soil and biochar types.
Ajuts:	Ministerio de Ciencia e Innovación CGL2010-15766
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Biochar ; Microorganisms ; Soil fauna ; Litter ; Decomposition ; Mineralization
Publicat a:	Soil biology and biochemistry, Vol. 72 (May 2014) , p. 152-162, ISSN 0038-0717

DOI: 10.1016/j.soilbio.2014.01.035

Post-print 47 p, 913.4 KB

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