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Spatial variability models of CO2 emissions from soils colonized by grass (Deschampsia antarctica) and moss (Sanionia uncinata) in Admiralty Bay, King George Island

Published online by Cambridge University Press:  20 August 2010

Eduardo de Sá Mendonça ,
Newton La Scala Jr ,
Alan Rodrigo Panosso ,
Felipe N.B. Simas  and
Carlos E.G.R. Schaefer
Eduardo de Sá Mendonça
Affiliation:
Department of Plant Production, Federal University of Espírito Santo, 29500-000, Alegre, ES, Brazil Advisor at the Soil and Plant Nutrition Post-graduation Program, Federal University of Viçosa, 36570-000, Viçosa, Minas Gerais, Brazil
Newton La Scala Jr*
Affiliation:
FCAV, Univ Estadual Paulista, Via de Acesso Prof. Paulo Donato Castellane s/n, 14884-900, Jaboticabal, SP, Brazil
Alan Rodrigo Panosso
Affiliation:
FCAV, Univ Estadual Paulista, Via de Acesso Prof. Paulo Donato Castellane s/n, 14884-900, Jaboticabal, SP, Brazil
Felipe N.B. Simas
Affiliation:
Soil Science Department, Federal University of Viçosa, Av. PH Rolfs, s/n, 36570-000, Viçosa, Minas Gerais, Brazil
Carlos E.G.R. Schaefer
Affiliation:
Soil Science Department, Federal University of Viçosa, Av. PH Rolfs, s/n, 36570-000, Viçosa, Minas Gerais, Brazil
*
*corresponding author: lascala@fcav.unesp.br
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Abstract

Soil CO2 emission is an important part of the terrestrial carbon cycling and is influenced by several factors, such as type and distribution of vegetation. In this work we evaluated the spatial variability of soil CO2 emission in terrestrial ecosystems of maritime Antarctica, under two contrasting vegetation covers: 1) grass areas of Deschampsia antarctica Desv., and 2) moss carpets of Sanionia uncinata (Hedw.) Loeske. Highest mean emission was obtained for the Deschampsia (4.13 μmol m-2 s-1) developed on organic-rich soil with a strong penguin influence. The overall results indicate that soil temperature is not directly related to the spatial pattern of soil CO2 emission at the sites studied. Emission adjusted models were Gaussian and exponential with ranges varying from 1.3 to 2.8 m, depending on the studied site and vegetation cover.

Keywords

Cryosolsgeostatisticsgreenhouse gasesmaritime Antarcticsoil carbonsoil respiration
Type
Biological Sciences
Information
Antarctic Science , Volume 23 , Issue 1 , February 2011 , pp. 27 - 33
Copyright
Copyright © Antarctic Science Ltd 2011

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