The Optical, Chemical, and Molecular Dissolved Organic Matter Succession Along a Boreal Soil‐Stream‐River Continuum

Hutchins, Ryan H. S.; Aukes, Pieter J. K.; Schiff, Sherry L.; Dittmar, Thorsten; Prairie, Yves T.; Giorgio, Paul A. del

doi:10.1002/2017jg004094

Cited by 65 publications

(76 citation statements)

References 73 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We observed a linear relationship between river p CO 2 and DOC when all sites were analyzed together, a pattern that has been previously reported in the literature (Bodmer et al, ; D'Amario & Xenopoulos, ; Humborg et al, ; Lapierre et al, ; Neal et al, ; Rasilo et al, ; Teodoru et al, ). This relationship may reflect a common soil origin of CO 2 and DOC, and also the fact that CO 2 may be produced within streams from the degradation of soil‐derived DOC; the reality is a likely combination of both (Hutchins et al, ). However, the relationship is weak only explaining 17% of the variation which could be caused by degassing of CO 2 throughout the network as is reflected in the negative relationship with CO 2 and distance downstream.…”

Section: Discussionmentioning

confidence: 99%

Large‐Scale Landscape Drivers of CO₂, CH₄, DOC, and DIC in Boreal River Networks

Hutchins

Prairie

Giorgio

2019

Global Biogeochemical Cycles

Self Cite

View full text Add to dashboard Cite

The boreal biome is characterized by extremely dense and complex fluvial networks that are closely coupled to land. Reconstructing the role that these fluvial networks play in regional carbon (C) budgets requires identifying landscape and environmental drivers of riverine C that operate at the whole network scale and that can be applied across landscapes. Here we explore drivers of CO2, CH4, and dissolved organic (DOC) and inorganic C (DIC) across 190 streams and rivers spanning 8 Strahler orders over an area of 500,000 km2 of heterogeneous boreal landscape in Québec, focusing on those drivers that can be readily obtained from remote sensing data. Each C species (except DIC) could be modeled as a function of a proximal network‐scale property, such as flow distance or elevation, but adding regional structure to these models greatly improved predictions. These modeled regional effects were similar for DOC, CO2, and CH4 and were strongly related to average regional soil organic content and especially to NPP, the latter integrating regional differences in climate and other environmental factors. These results suggest that there may be regional C baselines determined by a combination of landscape and climate features, which simultaneously influence the average CO2, DOC, and CH4 within fluvial networks, albeit through different underlying mechanisms and with varying degrees of influence on each C species. The latter two C species appear to be more sensitive to regional differences in soil, NPP, and climate than CO2 or DIC, and therefore more likely to shift under future scenarios of change in northern landscapes.

show abstract

Section: Discussionmentioning

confidence: 99%

Large‐Scale Landscape Drivers of CO₂, CH₄, DOC, and DIC in Boreal River Networks

Hutchins

Prairie

Giorgio

2019

Global Biogeochemical Cycles

Self Cite

View full text Add to dashboard Cite

show abstract

“…Importantly, the observed high biolability of aged OC and the downstream lability‐age continuum may apply to systems outside of the Arctic, provided these systems receive aged components of varying composition in unknown proportion to modern organic matter (Barnes et al, ; Guillemette et al, ). In such circumstances where the loss of aged carbon is masked by modern processes, the methods described in this study may assist in connecting the age of DOM with the processes by which it is biologically and physically fractionated from soils to fluvial networks (Hutchins et al, ). Ultimately, the integration and layering of these DOM and DIC age dynamics into frameworks like the “River Continuum Concept” or the “River as a Chemostat” will help biogeochemists better partition the cycling of modern versus aged carbon and propel research in this important domain (Creed et al, ; Vannote et al, ).…”

Section: Discussionmentioning

confidence: 99%

The Ephemeral Signature of Permafrost Carbon in an Arctic Fluvial Network

et al. 2018

View full text Add to dashboard Cite

Arctic fluvial networks process, outgas, and transport significant quantities of terrestrial organic carbon (C), particularly dissolved organic carbon (DOC). The proportion of permafrost C in these fluxes, however, is poorly constrained. A primary obstacle to the quantification of permafrost‐derived DOC is that it is rapidly respired without leaving a unique tracer of its presence. In this study, we investigated the production of bacterial respiratory carbon dioxide (CO2; measured as dissolved inorganic carbon; DIC) during maximum late‐summer thaw in sites spanning a fluvial network (Kolyma Basin, Siberia) to assess whether the biodegradation of permafrost DOC could be detected by the presence of a persistent aged (14C‐depleted) signature on the DIC pool. Using Keeling plot interpretation of DIC produced in bioincubations of river water, we show that bacteria respire varying sources of DOC moving downstream through the fluvial network. Respiration of permafrost (production of aged CO2) was only detected in heavily permafrost thaw influenced sites. In nonpermafrost thaw impacted sites, ambient DIC was modern (14C‐enriched), but rather than precluding the respiration of permafrost OC upstream, we suggest that 14C‐depleted DIC is overwhelmed by modern DIC. Investigation of dissolved organic matter composition via Fourier transform ion cyclotron resonance mass spectrometry highlighted that elevated levels of aliphatic and nitrogen‐containing compounds were associated with the production of aged DIC, providing molecular‐level insight as to why permafrost‐derived dissolved organic matter is rapidly respired. Overall, results from this study demonstrate the difficulty of tracing inputs of a highly reactive substrate to systems with diverse organic matter sources.

show abstract

“…The aquatic continuum can be regarded as a gradient of water residence times. Along this gradient, DOM decomposition rates have been found to decrease (Catalán et al, 2016;Evans et al, 2017) and DOM composition varies systematically (Hutchins et al, 2017;Kellerman et al, 2014;Lambert et al, 2016). Roughly half of the terrestrially derived organic matter is lost during transport through the aquatic continuum (Algesten et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Selective Adsorption of Terrestrial Dissolved Organic Matter to Inorganic Surfaces Along a Boreal Inland Water Continuum

et al. 2020

View full text Add to dashboard Cite

Different processes contribute to the loss or transformation of dissolved organic matter (DOM) and change DOM concentration and composition systematically along the inland water continuum. Substantial efforts have been made to estimate the importance of microbial and photochemical degradation for DOM concentration and composition and, to some extent, also DOM losses by flocculation, whereas the significance of DOM adsorption to inorganic surfaces has received less attention. Hence, knowledge on the possible extent of adsorption, its effect on DOM loads and composition and on where along the aquatic continuum it might be important, is currently limited or lacking altogether. Here we experimentally determine DOM adsorption onto mineral particles in freshwater ecosystems covering a water residence time gradient in boreal landscape Sweden. We hypothesized that adsorption would gradually decrease with increasing water residence time but actually found that DOM is highly susceptible to adsorption throughout the aquatic continuum. Mass spectrometry and fluorescence analysis on DOM suggest that freshly produced aquatic DOM is less susceptible to adsorption than more terrestrial material. Moreover, the percentage DOM adsorbed in the experiments greatly exceeds the actual adsorption taking place in boreal inland waters across all studied systems. These results illustrate the potential impact of mineral erosion, for example, as a result of agriculture, mining or forestry practices, on the availability, transport, and composition of organic carbon in inland waters.

show abstract

The Optical, Chemical, and Molecular Dissolved Organic Matter Succession Along a Boreal Soil‐Stream‐River Continuum

Cited by 65 publications

References 73 publications

Large‐Scale Landscape Drivers of CO₂, CH₄, DOC, and DIC in Boreal River Networks

Large‐Scale Landscape Drivers of CO₂, CH₄, DOC, and DIC in Boreal River Networks

The Ephemeral Signature of Permafrost Carbon in an Arctic Fluvial Network

Selective Adsorption of Terrestrial Dissolved Organic Matter to Inorganic Surfaces Along a Boreal Inland Water Continuum

Contact Info

Product

Resources

About

The Optical, Chemical, and Molecular Dissolved Organic Matter Succession Along a Boreal Soil‐Stream‐River Continuum

Cited by 65 publications

References 73 publications

Large‐Scale Landscape Drivers of CO2, CH4, DOC, and DIC in Boreal River Networks

Large‐Scale Landscape Drivers of CO2, CH4, DOC, and DIC in Boreal River Networks

The Ephemeral Signature of Permafrost Carbon in an Arctic Fluvial Network

Selective Adsorption of Terrestrial Dissolved Organic Matter to Inorganic Surfaces Along a Boreal Inland Water Continuum

Contact Info

Product

Resources

About

Large‐Scale Landscape Drivers of CO₂, CH₄, DOC, and DIC in Boreal River Networks

Large‐Scale Landscape Drivers of CO₂, CH₄, DOC, and DIC in Boreal River Networks