Radiocarbon measurements of ecosystem respiration and soil pore-space CO₂ in Utqiaġvik (Barrow), Alaska

• Main Authors: L. J. S. Vaughn, M. S. Torn
• Format: Article
• Language: English
• Published: Copernicus Publications 2018-10-01
• Series: Earth System Science Data
• Online Access: https://www.earth-syst-sci-data.net/10/1943/2018/essd-10-1943-2018.pdf

<p>Radiocarbon measurements of ecosystem respiration and soil pore space CO₂ are useful for determining the sources of ecosystem respiration, identifying environmental controls on soil carbon cycling rates, and parameterizing and evaluating models of the carbon cycle. We measured flux rates and radiocarbon content of ecosystem respiration, as well as radiocarbon in soil profile CO₂ in Utqiaġvik (Barrow), Alaska, during the summers of 2012, 2013, and 2014. We found that radiocarbon in ecosystem respiration (Δ¹⁴C_Reco) ranged from +60.5 to −160&thinsp;‰ with a median value of +23.3&thinsp;‰. Ecosystem respiration became more depleted in radiocarbon from summer to autumn, indicating increased decomposition of old soil organic carbon and/or decreased CO₂ production from fast-cycling carbon pools. Across permafrost features, ecosystem respiration from high-centered polygons was depleted in radiocarbon relative to other polygon types. Radiocarbon content in soil pore-space CO₂ varied between −7.1 and −280&thinsp;‰, becoming more negative with depth in individual soil profiles. These pore-space radiocarbon values correspond to CO₂ mean ages of 410 to 3350 years, based on a steady-state, one-pool model. Together, these data indicate that deep soil respiration was derived primarily from old, slow-cycling carbon, but that total CO₂ fluxes depended largely on autotrophic respiration and heterotrophic decomposition of fast-cycling carbon within the shallowest soil layers. The relative contributions of these different CO₂ sources were highly variable across microtopographic features and time in the sampling season. The highly negative Δ¹⁴C values in soil pore-space CO₂ and autumn ecosystem respiration indicate that when it is not frozen, very old soil carbon is vulnerable to decomposition. Radiocarbon data and associated CO₂ flux and temperature data are stored in the data repository of the Next Generation Ecosystem Experiments (NGEE-Arctic) at <a href="http://dx.doi.org/10.5440/1364062" target="_blank">http://dx.doi.org/10.5440/1364062</a> and <a href="https://doi.org/10.5440/1418853" target="_blank">https://doi.org/10.5440/1418853</a>.</p>