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Transport and humification of dissolved organic matter within a semi-arid floodplain

Journal Article · · Journal of Environmental Sciences

Here, in order to understand the transport and humification processes of dissolved organic matter (DOM) within sediments of a semi-arid floodplain at Rifle, Colorado, fluorescence excitation–emission matrix (EEM) spectroscopy, humification index (HIX) and specific UV absorbance (SUVA) at 254 nm were applied for characterizing depth and seasonal variations of DOM composition. Results revealed that late spring snowmelt leached relatively fresh DOM from plant residue and soil organic matter down into the deeper vadose zone (VZ). More humified DOM is preferentially adsorbed by upper VZ sediments, while non- or less-humified DOM was transported into the deeper VZ. Interestingly, DOM at all depths undergoes rapid biological humification process evidenced by the products of microbial by-product-like (i.e., tyrosine-like and tryptophan-like) matter in late spring and early summer, particularly in the deeper VZ, resulting in more humified DOM (e.g., fulvic-acid-like and humic-acid-like substances) at the end of year. This indicates that DOM transport is dominated by spring snowmelt, and DOM humification is controlled by microbial degradation, with seasonal variations. It is expected that these relatively simple spectroscopic measurements (e.g., EEM spectroscopy, HIX and SUVA) applied to depth- and temporally-distributed pore-water samples can provide useful insights into transport and humification of DOM in other subsurface environments as well.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1532254
Alternate ID(s):
OSTI ID: 1495873
Journal Information:
Journal of Environmental Sciences, Journal Name: Journal of Environmental Sciences Journal Issue: C Vol. 57; ISSN 1001-0742
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (44)

Molecular characterization of dissolved organic matter (DOM): a critical review journal September 2012
Dissolved organic matter (DOM) concentration and quality in a forested mid-Atlantic watershed, USA journal January 2011
Influence of hydrological, biogeochemical and temperature transients on subsurface carbon fluxes in a flood plain environment journal February 2016
Characterization of marine and terrestrial DOM in seawater using excitation-emission matrix spectroscopy journal January 1996
Differentiating with fluorescence spectroscopy the sources of dissolved organic matter in soils subjected to drying journal January 1999
A comparative characterization of dissolved organic matter by means of original aqueous samples and isolated humic substances journal June 2000
Geochemical, mineralogical and microbiological characteristics of sediment from a naturally reduced zone in a uranium-contaminated aquifer journal August 2012
Characterization of water extractable organic matter in a deep soil profile journal March 2006
Effects of climate change on soil respiration and carbon processing in Mediterranean and semi-arid regions: An experimental approach journal September 2012
Multicomponent reactive transport modeling of uranium bioremediation field experiments journal October 2009
Investigating dissolved organic matter decomposition in northern peatlands using complimentary analytical techniques journal July 2013
Soil carbon sequestration to mitigate climate change journal November 2004
Variably saturated flow and multicomponent biogeochemical reactive transport modeling of a uranium bioremediation field experiment journal November 2011
Physico-Chemical Heterogeneity of Organic-Rich Sediments in the Rifle Aquifer, CO: Impact on Uranium Biogeochemistry journal December 2015
Marine Optical Biogeochemistry:  The Chemistry of Ocean Color journal January 2007
Advanced Instrumental Approaches for Characterization of Marine Dissolved Organic Matter:  Extraction Techniques, Mass Spectrometry, and Nuclear Magnetic Resonance Spectroscopy journal February 2007
Effect of Organic Amendments on Herbicide Sorption as Related to the Nature of the Dissolved Organic Matter journal September 2000
Sorption of dissolved organic carbon by hydrous aluminum and iron oxides occurring at the confluence of Deer Creek with the Snake River, Summit County, Colorado journal July 1992
Fulvic Acid Oxidation State Detection Using Fluorescence Spectroscopy journal July 2002
Fluorescence Inner-Filtering Correction for Determining the Humification Index of Dissolved Organic Matter journal February 2002
Evaluation of Specific Ultraviolet Absorbance as an Indicator of the Chemical Composition and Reactivity of Dissolved Organic Carbon journal October 2003
Peer Reviewed: Characterizing Aquatic Dissolved Organic Matter journal January 2003
Fluorescence Excitation−Emission Matrix Regional Integration to Quantify Spectra for Dissolved Organic Matter journal December 2003
Fluorescence Spectroscopy Reveals Ubiquitous Presence of Oxidized and Reduced Quinones in Dissolved Organic Matter journal November 2005
Parallel Factor Analysis of Excitation–Emission Matrix Fluorescence Spectra of Water Soluble Soil Organic Matter as Basis for the Determination of Conditional Metal Binding Parameters journal January 2008
Temperature and Hydrologic Controls on Dissolved Organic Matter Mobilization and Transport within a Forest Topsoil journal June 2010
Fluorescence Tracking of Dissolved and Particulate Organic Matter Quality in a River-Dominated Estuary journal July 2012
Dissolved Organic Matter Quality and Bioavailability Changes Across an Urbanization Gradient in Headwater Streams journal June 2014
Dynamics of dissolved and particulate organic carbon in a saline and semiarid stream of southeast Spain (Chicamo stream) journal January 2001
Characterization of dissolved organic matter in the Black Sea by fluorescence spectroscopy journal November 1990
Contribution of semi-arid ecosystems to interannual variability of the global carbon cycle journal May 2014
Roles of dissolved organic matter in the speciation of mercury and methylmercury in a contaminated ecosystem in Oak Ridge, Tennessee journal January 2010
Acetate Availability and its Influence on Sustainable Bioremediation of Uranium-Contaminated Groundwater journal June 2011
Soil organic matter in arid and semiarid ecosystems: Sources, accumulation, and distribution journal January 1989
Controls on the Dynamics of Dissolved Organic Matter in Soils: a Review journal January 2000
Soil Carbon Sequestration to Mitigate Climate Change and Advance food Security journal January 2007
Drylands in the Earth System journal January 2010
The dominant role of semi-arid ecosystems in the trend and variability of the land CO2 sink journal May 2015
Stimulating the In Situ Activity of Geobacter Species To Remove Uranium from the Groundwater of a Uranium-Contaminated Aquifer journal October 2003
Fluorescence Intensity Calibration Using the Raman Scatter Peak of Water journal August 2009
Dissolved Organic Carbon In Northern Hardwood Stands With Differing Acidic Inputs and Temperature Regimes journal September 1995
Biodegradability of Dissolved Organic Matter in Forest Throughfall, Soil Solution, and Stream Water journal January 1992
Dissolved Organic Matter Characterization Using Multiway Spectral Decomposition of Fluorescence Landscapes journal January 2006
Deep Vadose Zone Respiration Contributions to Carbon Dioxide Fluxes from a Semiarid Floodplain journal January 2016

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