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CO2-C losses and carbon quality of selected Maritime Antarctic soils

Published online by Cambridge University Press:  03 October 2012

Juliana Vanir De Souza Carvalho
Affiliation:
Chemistry Department, Universidade do Estado de Minas Gerais, Av. Olegário Maciel 1427, 36500-000, Ubá, Minas Gerais, Brazil
Eduardo De Sá Mendonça*
Affiliation:
Department of Plant Production, Federal University of Espírito Santo, 29500-000, Alegre, ES, Brazil
Newton La Scala JR
Affiliation:
FCAV, Universidade Estadual Paulista, Via de Acesso Prof Paulo Donato Castellane s/n, 14884-900, Jaboticabal, SP, Brazil
César Reis
Affiliation:
Chemistry Department, Federal University of Viçosa, Av. PH Rolfs, s/n, 36570-000, Viçosa, Minas Gerais, Brazil
Efrain Lázaro Reis
Affiliation:
Chemistry Department, Federal University of Viçosa, Av. PH Rolfs, s/n, 36570-000, Viçosa, Minas Gerais, Brazil
Carlos E.G.R. Schaefer
Affiliation:
Visiting scholar, Scott Polar Research Institute, Lensfield Rd, Cambridge CB2 1ER, UK
*
*corresponding author: [email protected]

Abstract

Polar Regions are the most important soil carbon reservoirs on Earth. Monitoring soil carbon storage in a changing global climate context may indicate possible effects of climate change on terrestrial environments. In this regard, we need to understand the dynamics of soil organic matter in relation to its chemical characteristics. We evaluated the influence of chemical characteristics of humic substances on the process of soil organic matter mineralization in selected Maritime Antarctic soils. A laboratory assay was carried out with soils from five locations from King George Island. We determined the contents of total organic carbon, oxidizable carbon fractions of soil organic matter, and humic substances. Two in situ field experiments were carried out during two summers, in order to evaluate the CO2-C emissions in relation to soil temperature variations. The overall low amounts of soil organic matter in Maritime Antarctic soils have a low humification degree and reduced microbial activity. CO2-C emissions showed significant exponential relationship with temperature, suggesting a sharp increase in CO2-C emissions with a warming scenario, and Q10 values (the percentage increase in emission for a 10°C increase in soil temperature) were higher than values reported from elsewhere. The sensitivity of the CO2-C emission in relation to temperature was significantly correlated with the humification degree of soil organic matter and microbial activity for Antarctic soils.

Type
Biological Sciences
Copyright
Copyright © Antarctic Science Ltd 2012

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