Hydrology and dissolved organic carbon biogeochemistry in an ombrotrophic bog

Fraser, Christian; Roulet, Nigel T.; Moore, Tim R.

doi:10.1002/hyp.322

Cited by 158 publications

(167 citation statements)

References 39 publications

Supporting

Mentioning

153

Contrasting

Order By: Relevance

“…The organic C, N and P concentrations reported in this study fall within the range reported in other studies of forested (Qualls and Haines 1991;Michalzik et al 2001) and wetland soils (Fraser et al 2001;Blodau et al 2004), which supports the idea that DOM concentrations in wetland soils are signiWcantly greater than in upland forest soils. The organic forms of N and P dominated soil solution for all soil types and suggests that DON and DOP are an important component of nutrient cycling in coastal temperate soils.…”

Section: Dissolved C N and P Concentrationssupporting

confidence: 91%

“…This long residence time for DOM in the bog soils could lead to a high degree of microbial modiWcation of the original source material. Moreover, research from Mer Blue bog, Canada has shown that the Xuorescent properties of soil solution DOM changed from plant-derived to more microbiallike with depth in the soil proWle, which was attributed to the microbial consumption of available DOM (Fraser et al 2001). We therefore propose the pool of DOM in bog soil waters reXects both substantial microbial modiWcation of the original source material and subsequent production of more microbial-like DOM.…”

Section: Indicators Of Biodegradable Docmentioning

confidence: 89%

“…The fen in contrast had signiWcantly lower DOC concentrations than the bog and forested wetland and suggests that continuous soil Xushing in fens results in low pore water DOC concentrations (Urban et al 1989). Seasonal changes in DOC and DON concentrations have been previously documented in both wetland (Devito et al 1989;Fraser et al 2001) and forested landscapes (Qualls and Haines 1991;Yano et al 2004). Concentrations of DOC and DON exhibited contrasting seasonal patterns in the bog and forested wetland suggesting controls on DOC production and/or removal may be diVerent than those for DON.…”

Section: Dissolved C N and P Concentrationsmentioning

confidence: 91%

“…soil properties), hydrologic inputs, and dominant vegetation. For example, the greater DOC concentrations in the bog and forested wetland could result from seasonal water table drawdown in combination with greater rates of organic matter decomposition and subsequent DOC production in the aerobic surface horizons (McKnight et al 1985;Fraser et al 2001). The fen in contrast had signiWcantly lower DOC concentrations than the bog and forested wetland and suggests that continuous soil Xushing in fens results in low pore water DOC concentrations (Urban et al 1989).…”

Section: Dissolved C N and P Concentrationsmentioning

confidence: 99%

“…Concentrations of DOC and DON exhibited contrasting seasonal patterns in the bog and forested wetland suggesting controls on DOC production and/or removal may be diVerent than those for DON. During the spring snowmelt period, low wetland DOC concentrations can be attributed to prolonged soil saturation and subsequent dilution of soil pools of DOC (Fraser et al 2001;Worrall et al 2002). However, DOP and DON concentrations exhibited maxima during the spring which suggests that decreased biotic demand (Devito et al 1989) in combination with soil freeze thaw events (Fitzhugh et al 2001) can result in a pool of DON and DOP in soil solution that is potentially available to Xush to streams.…”

Section: Dissolved C N and P Concentrationsmentioning

confidence: 99%

See 4 more Smart Citations

Fluorescence characteristics and biodegradability of dissolved organic matter in forest and wetland soils from coastal temperate watersheds in southeast Alaska

et al. 2008

View full text Add to dashboard Cite

Understanding how the concentration and chemical quality of dissolved organic matter (DOM) varies in soils is critical because DOM inXuences an array of biological, chemical, and physical processes. We used PARAFAC modeling of excitation-emission Xuorescence spectroscopy, speciWc UV absorbance (SUVA 254 ) and biodegradable dissolved organic carbon (BDOC) incubations to investigate the chemical quality of DOM in soil water collected from 25 cm piezometers in four diVerent wetland and forest soils: bog, forested wetland, fen and upland forest. There were signiWcant diVerences in soil solution concentrations of dissolved organic C, N, and P, DOC:DON ratios, SUVA 254 and BDOC among the four soil types. Throughout the sampling period, average DOC concentrations in the four soil types ranged from 9-32 mg C l ¡1 and between 23-42% of the DOC was biodegradable. Seasonal patterns in dissolved nutrient concentrations and BDOC were observed in the three wetland types suggesting strong biotic controls over DOM concentrations in wetland soils. PARAFAC modeling of excitation-emission Xuorescence spectroscopy showed that protein-like Xuorescence was positively correlated (r 2 = 0.82; P < 0.001) with BDOC for all soil types taken together. This Wnding indicates that PARAFAC modeling may substantially improve the ability to predict BDOC in natural environments. Coincident measurements of DOM concentrations, BDOC and PARA-FAC modeling conWrmed that the four soil types contain DOM with distinct chemical properties and have unique Xuorescent Wngerprints. DOM inputs to streams from the four soil types therefore have the potential to alter stream biogeochemical processes diVerently by inXuencing temporal patterns in stream heterotrophic productivity.

show abstract

Section: Dissolved C N and P Concentrationssupporting

confidence: 91%

Section: Indicators Of Biodegradable Docmentioning

confidence: 89%

Section: Dissolved C N and P Concentrationsmentioning

confidence: 91%

Section: Dissolved C N and P Concentrationsmentioning

confidence: 99%

Section: Dissolved C N and P Concentrationsmentioning

confidence: 99%

See 3 more Smart Citations

Fluorescence characteristics and biodegradability of dissolved organic matter in forest and wetland soils from coastal temperate watersheds in southeast Alaska

et al. 2008

View full text Add to dashboard Cite

show abstract

The effect of long-term water table manipulations on dissolved organic carbon dynamics in a poor fen peatland

Hribljan

Kane

Pypker

et al. 2014

J. Geophys. Res. Biogeosci.

View full text Add to dashboard Cite

Dissolved organic carbon (DOC) production, consumption, and quality displayed differences after long-term (~55 years) hydrological alterations in a poor fen peatland in northern Michigan. The construction of an earthen levee resulted in areas of a raised and lowered water table (WT) relative to an unaltered intermediate WT site. The lowered WT site had greater peat aeration and larger seasonal vertical WT fluctuations that likely elevated peat decomposition and subsidence with subsequent increases in bulk density, vertical hydraulic gradient, decreased hydraulic conductivity (K sat ), and a greater pore water residence time relative to the unaltered site. The raised WT site displayed a decreased K sat combined with seasonal upwelling events that contributed to a longer residence time in comparison to the unaltered site. These differences are potentially contributing to elevated DOC concentrations at the lowered and raised WT site relative to the unaltered site. Additionally, spectrophotometric indices and chemical constituent assays indicated that the lowered site DOC was more aromatic and contained elevated concentrations of phenolics compared to the intermediate site. The raised site DOC was less aromatic, less humified, and also had a greater phenolic content than the intermediate site. Furthermore, an incubation experiment showed that DOC in the raised site contained the greatest labile carbon source. Based on our results, long-term WT alterations will likely impose significant effects on DOC dynamics in these peatlands; however, WT position alone was not a good predictor of DOC concentrations, though impoundment appears to produce a more labile DOC whereas drainage increases DOC aromaticity.

show abstract

References

2007

Geomorphology of Upland Peat

View full text Add to dashboard Cite

Hydrology and dissolved organic carbon biogeochemistry in an ombrotrophic bog

Cited by 158 publications

References 39 publications

Fluorescence characteristics and biodegradability of dissolved organic matter in forest and wetland soils from coastal temperate watersheds in southeast Alaska

Fluorescence characteristics and biodegradability of dissolved organic matter in forest and wetland soils from coastal temperate watersheds in southeast Alaska

The effect of long-term water table manipulations on dissolved organic carbon dynamics in a poor fen peatland

References

Contact Info

Product

Resources

About