Dissolved Organic Matter Quality and Bioavailability Changes Across an Urbanization Gradient in Headwater Streams

2014 ◽  
Vol 48 (14) ◽  
pp. 7817-7824 ◽  
Author(s):  
Jacob D. Hosen ◽  
Owen T. McDonough ◽  
Catherine M. Febria ◽  
Margaret A. Palmer
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Headwater Streams ◽  
Organic Matter Quality ◽  
Urbanization Gradient

scholarly journals Linkages between denitrification and dissolved organic matter quality, Boulder Creek watershed, Colorado

2012 ◽  
Vol 117 (G1) ◽  
Author(s):  
Rebecca T. Barnes ◽  
Richard L. Smith ◽  
George R. Aiken
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Organic Matter Quality ◽  
Creek Watershed

scholarly journals Regional diversity of complex dissolved organic matter across forested hemiboreal headwater streams

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Jeffrey A. Hawkes ◽  
Nikola Radoman ◽  
Jonas Bergquist ◽  
Marcus B. Wallin ◽  
Lars J. Tranvik ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Headwater Streams ◽  
Regional Diversity

scholarly journals Mimicking floodplain reconnection and disconnection using <sup>15</sup>N mesocosm incubations

2012 ◽  
Vol 9 (11) ◽  
pp. 4263-4278 ◽  
Author(s):  
N. Welti ◽  
E. Bondar-Kunze ◽  
M. Mair ◽  
P. Bonin ◽  
W. Wanek ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Nitrogen Retention ◽  
Danube River ◽  
Nitrous Oxide Emissions ◽  
Organic Matter Quality ◽  
Main River Channel ◽  
Order Of Magnitude ◽  
Floodplain Reconnection ◽  
Floodplain Sediments

Abstract. Floodplain restoration changes the nitrate delivery pattern and dissolved organic matter pool in backwaters, though the effects these changes have are not yet well known. We performed two mesocosm experiments on floodplain sediments to quantify the nitrate metabolism in two types of floodplains. Rates of denitrification, dissimilatory nitrate reduction to ammonium (DNRA) and anammox were measured using 15N-NO3 tracer additions in mesocosms of undisturbed floodplain sediments originating from (1) restored and (2) disconnected sites in the Alluvial Zone National Park on the Danube River downstream of Vienna, Austria. DNRA rates were an order of magnitude lower than denitrification and neither rate was affected by changes in nitrate delivery pattern or organic matter quality. Anammox was not detected at any of the sites. Denitrification was out-competed by assimilation, which was estimated to use up to 70% of the available nitrate. Overall, denitrification was higher in the restored sites, with mean rates of 5.7 ± 2.8 mmol N m−2 h−1 compared to the disconnected site (0.6 ± 0.5 mmol N m−2 h−1). In addition, ratios of N2O : N2 were lower in the restored site indicating a more complete denitrification. Nitrate addition had neither an effect on denitrification, nor on the N2O : N2 ratio. However, DOM (dissolved organic matter) quality significantly changed the N2O : N2 ratio in both sites. Addition of riverine-derived organic matter lowered the N2O : N2 ratio in the disconnected site, whereas addition of floodplain-derived organic matter increased the N2O : N2 ratio in the restored site. These results demonstrate that increasing floodplains hydrological connection to the main river channel increases nitrogen retention and decreases nitrous oxide emissions.

Influence of bedrock geology on dissolved organic matter quality in stream water

2010 ◽  
Vol 41 (11) ◽  
pp. 1177-1188 ◽  
Author(s):  
Jennifer J. Mosher ◽  
Geoffrey C. Klein ◽  
Alan G. Marshall ◽  
Robert H. Findlay
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Stream Water ◽  
Organic Matter Quality ◽  
Bedrock Geology

Properties of dissolved organic matter related to soil organic matter quality and nitrogen additions in Norway spruce forest floors

Geoderma ◽  
2006 ◽  
Vol 130 (3-4) ◽  
pp. 250-264 ◽  
Author(s):  
Kerstin Michel ◽  
Egbert Matzner ◽  
Marie-France Dignac ◽  
Ingrid Kögel-Knabner
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Dissolved Organic Matter ◽  
Norway Spruce ◽  
Spruce Forest ◽  
Organic Matter Quality ◽  
Forest Floors ◽  
Soil Organic Matter Quality ◽  
Nitrogen Additions ◽  
Norway Spruce Forest

Regional variability in stream dissolved organic matter characteristics across forested regions of Canada, and its implications for drinking water treatability

2020 ◽  
Author(s):  
Julia Orlova ◽  
David Olefeldt ◽  
Fariba Amiri ◽  
Alyssa Bourgeois ◽  
Jim Buttle ◽  
...  
Keyword(s):  
Drinking Water ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Water Chemistry ◽  
Industrial Development ◽  
Headwater Streams ◽  
Drinking Water Treatment ◽  
System Stability ◽  
Spatial And Temporal Variability ◽  
Surface Water Chemistry

&lt;p&gt;Forested watersheds are a major source of drinking water for more than two thirds of Canadians. However, drinking water security is increasingly pressured by the combination of higher demands resulting from population growth and industrial development and climate change-exacerbated landscape disturbances (e.g., wildfires, hurricanes). These may lead to deteriorated, more variable source water quality that can challenge treatment operations beyond their response capacities and have the potential to cause service disruptions. The character and concentration of dissolved organic matter (DOM), as well their shifts in response to seasonal and event-based changes in streamflow, make DOM a key driver of drinking water treatment infrastructure needs and operational challenges. As part of the &lt;em&gt;for&lt;/em&gt;Water NSERC Network, which seeks to evaluate the impacts of pre-emptive forest management approaches on drinking water treatability in Canada, the objective of this study is to characterize differences in DOM concentrations and composition in headwater streams in different forested regions, including both undisturbed and disturbed catchments, and to evaluate the implications for drinking water treatability.&lt;/p&gt;&lt;p&gt;Our pan-Canadian study was conducted using existing long-term research sites, which span an area from 48.5&amp;#176; to 63&amp;#176; N between Canada&amp;#8217;s east and west coasts, and represent six major forested ecozones. These ecozones exhibit significant differences in soils, vegetation, hydrological systems, and consequently surface water chemistry. At each research site, 2 to 6 headwater streams were sampled several times in 2019 and 2020 to characterize seasonal and spatial variations in water chemistry. Where relevant, both disturbed (harvested or burned) and undisturbed catchments were sampled.&lt;/p&gt;&lt;p&gt;The spatial and temporal variability in DOM characteristics, including the effects of disturbances, were evaluated, and the links between DOM characteristics and drinking water treatability were explored. Distinct regional differences in the concentrations of major ions, dissolved organic carbon and nutrients were observed. Variations in DOM composition, as assessed through UV-vis absorbance and excitation-emission matrix (EEM) fluorescence spectroscopy, Fourier-transform ion cyclotron mass spectrometry (FT-ICR-MS), and asymmetric flow field-flow fractionation (AF4), were also detected. To characterize drinking water treatability, relative implications to coagulant demand, membrane fouling, and distribution system stability were evaluated. The true disinfection by-product formation potential for trihalomethanes and haloacetic acids after complete oxidation resulting from chlorination was also assessed. Collectively, the results of this study underscore the importance of better understanding and anticipating natural variations in stream DOM as well as the impacts of landscape disturbance to ensure the uninterrupted supply of safe drinking water.&lt;/p&gt;

Dynamics of dissolved organic matter in headwaters: comparison of headwater streams with contrasting DOM and nutrient composition

2020 ◽  
Vol 82 (2) ◽  
Author(s):  
Ophelie Fovet ◽  
David M. Cooper ◽  
Davey L. Jones ◽  
Timothy G. Jones ◽  
Chris D. Evans
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Headwater Streams ◽  
Nutrient Composition
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