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Biogeosciences An interactive open-access journal of the European Geosciences Union
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Volume 14, issue 18 | Copyright
Biogeosciences, 14, 4341-4354, 2017
https://doi.org/10.5194/bg-14-4341-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 28 Sep 2017

Research article | 28 Sep 2017

Soil respiration across a permafrost transition zone: spatial structure and environmental correlates

James C. Stegen1, Carolyn G. Anderson1, Ben Bond-Lamberty2, Alex R. Crump1, Xingyuan Chen3, and Nancy Hess4 James C. Stegen et al.
  • 1Pacific Northwest National Laboratory, Biological Sciences Division, Richland, WA, USA
  • 2Pacific Northwest National Laboratory, Joint Global Change Research Institute, College Park, MD, USA
  • 3Pacific Northwest National Laboratory, Atmospheric Sciences and Global Change Division, Richland, WA, USA
  • 4Pacific Northwest National Laboratory, Environmental Molecular Sciences Laboratory, Richland, WA, USA

Abstract. Soil respiration is a key ecosystem function whereby shifts in respiration rates can shift systems from carbon sinks to sources. Soil respiration in permafrost-associated systems is particularly important given climate change driven permafrost thaw that leads to significant uncertainty in resulting ecosystem carbon dynamics. Here we characterize the spatial structure and environmental drivers of soil respiration across a permafrost transition zone. We find that soil respiration is characterized by a non-linear threshold that occurs at active-layer depths greater than 140cm. We also find that within each season, tree basal area is a dominant driver of soil respiration regardless of spatial scale, but only in spatial domains with significant spatial variability in basal area. Our analyses further show that spatial variation (the coefficient of variation) and mean-variance power-law scaling of soil respiration in our boreal system are consistent with previous work in other ecosystems (e.g., tropical forests) and in population ecology, respectively. Comparing our results to those in other ecosystems suggests that temporally stable features such as tree-stand structure are often primary drivers of spatial variation in soil respiration. If so, this provides an opportunity to better estimate the magnitude and spatial variation in soil respiration through remote sensing. Combining such an approach with broader knowledge of thresholding behavior – here related to active layer depth – would provide empirical constraints on models aimed at predicting ecosystem responses to ongoing permafrost thaw.

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CO2 loss from soil to the atmosphere (soil respiration) is a key ecosystem function, especially in systems with permafrost. We find that soil respiration shows a non-linear threshold at permafrost depths > 140 cm and that the number of large trees governs soil respiration. This suggests that remote sensing could be used to estimate spatial variation in soil respiration and (with knowledge of key thresholds) empirically constrain models that predict ecosystem responses to permafrost thaw.
CO2 loss from soil to the atmosphere (soil respiration) is a key ecosystem function, especially...
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