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University of Arizona (2012)

Quantifying the Role of Hydrologic Variability in Soil Carbon Flux

Stielstra, Clare M.

Titre : Quantifying the Role of Hydrologic Variability in Soil Carbon Flux

Auteur : Stielstra, Clare M.

Université de soutenance : The University of Arizona

Grade : Master of Science (MS) 2012

Résumé
Soil carbon (C) is the largest terrestrial carbon pool. While inputs to this system are fairly well constrained, the diverse factors driving soil C efflux remain poorly understood. Carbon in surface soils is mobilized via two distinct pathways : CO₂ gas flux and dissolved C flux. The goal of this study was to quantify the role of hydrologic variability in mobilizing carbon as gaseous and dissolved fluxes from near-surface soils, and to determine their relative magnitudes. Data were collected through 2010 and 2011 from two subalpine sites in Arizona and New Mexico. I observed no significant variability in dissolved fluxes, and these values were low at all sites. In contrast, CO₂ fluxes were large (from 0.22 g C m⁻² d⁻¹ to 5.27 g C m⁻² d⁻¹) and varied between sites and between years. My results suggest that in arid montane forests soil carbon flux is critically linked to water availability.

Mots clés : DOC ; Hydrology ; Soil moisture ; Soil Respiration ; Carbon flux

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Page publiée le 19 septembre 2012, mise à jour le 8 avril 2019