Soil Respiration in European Grasslands in Relation to Climate and Assimilate Supply
Michael Bahn,Mirco Rodeghiero,Margaret Anderson-Dunn,Sabina Dore,Cristina Gimeno,Matthias Drösler,Michael Williams,Christof Ammann,Frank Berninger,Chris Flechard,Stephanie K. Jones,Manuela Balzarolo,Suresh Kumar,Christian Newesely,Tibor Priwitzer,Antonio Raschi,Rolf T. W. Siegwolf,Sanna Susiluoto,John Tenhunen,Georg Wohlfahrt,Alexander Cernusca +20 more
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TLDR
Temperature was a suitable surrogate for deriving estimates of annual Rs and temperature-independent seasonal fluctuations of Rs of an intensively managed pasture were closely related to changes in leaf area index (LAI), indicating that assimilate supply overrides potential acclimation to prevailing temperatures.Abstract:
Soil respiration constitutes the second largest flux of carbon (C) between terrestrial ecosystems and the atmosphere. This study provides a synthesis of soil respiration (R
s) in 20 European grasslands across a climatic transect, including ten meadows, eight pastures and two unmanaged grasslands. Maximum rates of R
s (
$$ R_{{{\text{s}}_{{{\text{max}}}} }} $$
), R
s at a reference soil temperature (10°C; $$ R_{{{\text{s}}_{{{\text{10}}}} }} $$
) and annual R
s (estimated for 13 sites) ranged from 1.9 to 15.9 μmol CO2 m−2 s−1, 0.3 to 5.5 μmol CO2 m−2 s−1 and 58 to 1988 g C m−2 y−1, respectively. Values obtained for Central European mountain meadows are amongst the highest so far reported for any type of ecosystem. Across all sites $$ R_{{{\text{s}}_{{{\text{max}}}} }} $$
was closely related to $$ R_{{{\text{s}}_{{{\text{10}}}} }} $$
. Assimilate supply affected R
s at timescales from daily (but not necessarily diurnal) to annual. Reductions of assimilate supply by removal of aboveground biomass through grazing and cutting resulted in a rapid and a significant decrease of R
s. Temperature-independent seasonal fluctuations of R
s of an intensively managed pasture were closely related to changes in leaf area index (LAI). Across sites $$ R_{{{\text{s}}_{{{\text{10}}}} }} $$
increased with mean annual soil temperature (MAT), LAI and gross primary productivity (GPP), indicating that assimilate supply overrides potential acclimation to prevailing temperatures. Also annual R
s was closely related to LAI and GPP. Because the latter two parameters were coupled to MAT, temperature was a suitable surrogate for deriving estimates of annual R
s across the grasslands studied. These findings contribute to our understanding of regional patterns of soil C fluxes and highlight the importance of assimilate supply for soil CO2 emissions at various timescales.read more
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References
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Journal ArticleDOI
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Linear Model Selection by Cross-validation
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