Spatial patterns of sedimentary O2 consumption at fine scale: a comparison study across ecosystems
Abstract
Heterogeneity in hydrologic systems affects the way transported quantities mix and the rate at which O2 is consumed. The understanding and upscaling of the dynamics of this process is of wide interest in a number of applications, including reactive transport in porous media, unsaturated flow, bacterial transport and biofilm growth. We present a novel experimental approach to study the effects of land use and substrate addition on the small-scale heterogeneity of O2 consumption by using PreSens Precision Sensing probe. We determine the spatial pattern of eight different sediments (representing four different types of ecosystems) for two types of carbon substrates (glucose and humic acid) and control (DI water and oven-dried sediment). We further use geo-statistical analysis to process the so obtained O2 images and determine inter-dispersion maps. The latter are used as a proxy for the small scale heterogeneity. Finally, for each ecosystem, oxygen consumption rates and spatially averaged inter-dispersion values are compared.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2013
- Bibcode:
- 2013AGUFMNS21B1572D
- Keywords:
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- 1051 GEOCHEMISTRY Sedimentary geochemistry;
- 0448 BIOGEOSCIENCES Geomicrobiology;
- 0414 BIOGEOSCIENCES Biogeochemical cycles;
- processes;
- and modeling