Spatial and temporal variability in soil CO2-C emissions and relation to soil temperature at King George Island, maritime Antarctica

Few studies have examined the effects of temperature on spatial and temporal trends in soil CO2-C emissions in Antarctica. In this work, we present in situ measurements of CO2-C emissions and assess their relation with soil temperature, using dynamic chambers. We found an exponential relation betwee...

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Bibliographic Details
Published in:Polar Science
Main Authors: La Scala, Newton, de Sá Mendonça, Eduardo, Vanir de Souza, Juliana, Panosso, Alan Rodrigo, Simas, Felipe N.B., Schaefer, Carlos E.G.R.
Other Authors: Universidade Estadual Paulista (UNESP)
Format: Other/Unknown Material
Language:English
Published: 2014
Subjects:
Climate change
Cryosols
Gelisols
Soil carbon stock
Soil respiration
carbon dioxide
frozen ground
grass
in situ measurement
moss
soil carbon
soil emission
soil temperature
spatiotemporal analysis
Antarctica
King George Island
South Shetland Islands
Bryophyta
Deschampsia antarctica
Poaceae
Antarc*
Polar Science
Online Access:http://acervodigital.unesp.br/handle/11449/71991
http://hdl.handle.net/11449/71991
https://doi.org/10.1016/j.polar.2010.07.001
Description
Summary:Few studies have examined the effects of temperature on spatial and temporal trends in soil CO2-C emissions in Antarctica. In this work, we present in situ measurements of CO2-C emissions and assess their relation with soil temperature, using dynamic chambers. We found an exponential relation between CO2 emissions and soil temperature, with the value of Q10 being close to 2.1. Mean emission rates were as low as 0.026 and 0.072 g of CO2-C m-2 h-1 for bare soil and soil covered with moss, respectively, and as high as 0.162 g of CO2-C m-2 h-1 for soil covered with grass, Deschampsia antarctica Desv. (Poaceae). A spatial variability analysis conducted using a 60-point grid, for an area with mosses (Sannionia uncianata) and D. antarctica, yielded a spherical semivariogram model for CO2-C emissions with a range of 1 m. The results suggest that soil temperature is a controlling factor on temporal variations in soil CO2-C emissions, although spatial variations appear to be more strongly related to the distribution of vegetation types. © 2010 Elsevier B.V. and NIPR.

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