scholarly journals Controls of Land Use and the River Continuum Concept on Dissolved Organic Matter Composition in an Anthropogenically Disturbed Subtropical Watershed

2019 ◽  
Author(s):  
Jesse Alan Roebuck ◽  
Michael Seidel ◽  
Thorsten Dittmar ◽  
Rudolf Jaffé
Keyword(s):  
Land Use ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
River Continuum Concept ◽  
River Continuum ◽  
Organic Matter Composition ◽  
Continuum Concept

Hydrologic and Riparian Influences on the Import and Storage of Coarse Particulate Organic Matter in a Prairie Stream

1988 ◽  
Vol 45 (4) ◽  
pp. 655-665 ◽  
Author(s):  
Martin E. Gurtz ◽  
G. Richard Marzolf ◽  
Keith T. Killingbeck ◽  
David L. Smith ◽  
J. Vaun McArthur
Keyword(s):  
Organic Matter ◽  
Particulate Organic Matter ◽  
Riparian Vegetation ◽  
River Continuum Concept ◽  
Hydrologic Regime ◽  
River Continuum ◽  
Coarse Particulate Organic Matter ◽  
Continuum Concept ◽  
And Storage ◽  
Prairie Stream

The hydrologic regime and zonation of riparian vegetation influenced the quantity and quality of coarse particulate organic matter (CPOM; >1 mm) stored in the channel and upper bank of a prairie stream. In a 5.4-km intermittent reach of the South Branch of Kings Creek on Konza Prairie, Kansas, total annual import was lowest in headwater reaches and increased downstream. Total storage of benthic CPOM in the dry channel and on the bank before the flow period was highest in the fourth- and fifth-order gallery forest zone (999 g ash-free dry mass∙m−2) and less in upstream reaches (320–341 g∙m−2). These longitudinal patterns of CPOM annual import and storage (before the flow period) were opposite those predicted by the river continuum concept for streams draining forested regions. Following flow, headwater channels had more CPOM (291 g∙m−2) than downstream reaches. On the bank, storage was always highest in downstream reaches. Composition of CPOM both in the channel and on the bank varied with changes in riparian vegetation; grass tissues dominated in headwater channels, while wood and leaves of trees and shrubs were more abundant downstream. During the flow period, storage of CPOM increased only in headwater channels, where retention was high despite the lack of woody debris. In this intermittent prairie stream, benthic CPOM may not contribute consistently to the terrestrial/aquatic linkages that are suggested in the river continuum concept because of (1) a paucity of large CPOM sources (e.g. trees, shrubs) in the upper reaches and (2) a hydrologic regime that reduces the amount, as well as the predictability, of stored CPOM. The biota of prairie streams must have opportunistic food gathering and reproductive strategies to take advantage of variable food resources in a flow environment that is itself very unpredictable.

Influence of catchment land use and seasonality on dissolved organic matter composition and ecosystem metabolism in headwater streams of a Kenyan river

2016 ◽  
Vol 132 (1-2) ◽  
pp. 1-22 ◽  
Author(s):  
Frank O. Masese ◽  
Jessica S. Salcedo-Borda ◽  
Gretchen M. Gettel ◽  
Kenneth Irvine ◽  
Michael E. McClain
Keyword(s):  
Land Use ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Headwater Streams ◽  
Ecosystem Metabolism ◽  
Organic Matter Composition

scholarly journals The river as a chemostat: fresh perspectives on dissolved organic matter flowing down the river continuum

2015 ◽  
Vol 72 (8) ◽  
pp. 1272-1285 ◽  
Author(s):  
Irena F. Creed ◽  
Diane M. McKnight ◽  
Brian A. Pellerin ◽  
Mark B. Green ◽  
Brian A. Bergamaschi ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
The United States ◽  
Biogeochemical Processes ◽  
River Continuum ◽  
The Us ◽  
Doc Concentration ◽  
Continuum Concept ◽  
Temporal Homogenization ◽  
Dom Composition

A better understanding is needed of how hydrological and biogeochemical processes control dissolved organic carbon (DOC) concentrations and dissolved organic matter (DOM) composition from headwaters downstream to large rivers. We examined a large DOM dataset from the National Water Information System of the US Geological Survey, which represents approximately 100 000 measurements of DOC concentration and DOM composition at many sites along rivers across the United States. Application of quantile regression revealed a tendency towards downstream spatial and temporal homogenization of DOC concentrations and a shift from dominance of aromatic DOM in headwaters to more aliphatic DOM downstream. The DOC concentration–discharge (C-Q) relationships at each site revealed a downstream tendency towards a slope of zero. We propose that despite complexities in river networks that have driven many revisions to the River Continuum Concept, rivers show a tendency towards chemostasis (C-Q slope of zero) because of a downstream shift from a dominance of hydrologic drivers that connect terrestrial DOM sources to streams in the headwaters towards a dominance of instream and near-stream biogeochemical processes that result in preferential losses of aromatic DOM and preferential gains of aliphatic DOM.

scholarly journals Microbial Community Structure Affects Marine Dissolved Organic Matter Composition

2016 ◽  
Vol 3 ◽  
Author(s):  
Elizabeth B. Kujawinski ◽  
Krista Longnecker ◽  
Katie L. Barott ◽  
Ralf J. M. Weber ◽  
Melissa C. Kido Soule
Keyword(s):  
Organic Matter ◽  
Community Structure ◽  
Microbial Community ◽  
Dissolved Organic Matter ◽  
Microbial Community Structure ◽  
Organic Matter Composition

Effect of dissolved organic matter composition on metal speciation in soil solutions

2015 ◽  
Vol 398 ◽  
pp. 61-69 ◽  
Author(s):  
Zong-Ling Ren ◽  
Marie Tella ◽  
Matthieu N. Bravin ◽  
Rob N.J. Comans ◽  
Jun Dai ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Metal Speciation ◽  
Organic Matter Composition ◽  
Soil Solutions

Characterization of atrazine binding to dissolved organic matter of soil under different types of land use

2018 ◽  
Vol 147 ◽  
pp. 1065-1072 ◽  
Author(s):  
Long-Ji Zhu ◽  
Yue Zhao ◽  
Yan-Ni Chen ◽  
Hong-Yang Cui ◽  
Yu-Quan Wei ◽  
...  
Keyword(s):  
Land Use ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Different Types
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