Identification of the riparian sources of aquatic dissolved organic carbon

Bishop, Kevin; Pettersson, Catharina; Allard, Bert; Lee, Ying-Hua

doi:10.1016/0160-4120(94)90062-0

Cited by 69 publications

(54 citation statements)

References 7 publications

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“…This has resulted in several articles over the years and a development of a mechanistic understanding of the importance of the riparian zone as a source for the stream organic carbon and other chemical parameters, as well as how these elements are transported across the soil/stream interface (Bishop et al, 1995;Laudon et al, 2004b;Klaminder et al, 2006;Cory et al, 2007;Köhler et al, 2009;Öquist et al, 2009b). The riparian zone has been identified as the most important source of carbon in the study stream (Bishop et al, 1994;Köhler et al, 2009;Seibert et al, 2009) and in short, DOC concentration in the stream can be modeled based on the groundwater level (Fig. 2, left panel) and a schematic soil DOC gradient in the riparian soil (Fig.…”

Section: What Controls Stream Doc Concentrations During Snowmelt?mentioning

confidence: 99%

“…In our glaciated forested study catchment the riparian soils are the most important source of carbon (Bishop et al, 1994;Köhler et al, 2009;Seibert et al, 2009). A shallow water table adjacent to the stream results in anaerobic conditions with a low decomposition rate; hence resulting in a build-up of organic material which leads to a peat formation along the stream channel (Vidon et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Regulation of stream water dissolved organic carbon (DOC) concentrations during snowmelt; the role of discharge, winter climate and memory effects

et al. 2010

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Abstract. Using a 15 year stream record from a northern boreal catchment, we demonstrate that the inter-annual variation in dissolved organic carbon (DOC) concentrations during snowmelt was related to discharge, winter climate and previous DOC export. A short and intense snowmelt gave higher stream water DOC concentrations, as did long winters, while a high previous DOC export during the antecedent summer and autumn resulted in lower concentrations during the following spring. By removing the effect of discharge we could detect that the length of winter affected the modeled soil water DOC concentrations during the following snowmelt period, which in turn affected the concentrations in the stream. Winter climate explained more of the stream water DOC variations than previous DOC export during the antecedent summer and autumn.

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Section: What Controls Stream Doc Concentrations During Snowmelt?mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Regulation of stream water dissolved organic carbon (DOC) concentrations during snowmelt; the role of discharge, winter climate and memory effects

et al. 2010

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“…Hydrological mobilization from organic rich soils adjacent to streams is an important control on DOC dynamics in forest dominated boreal catchments (Winterdahl et al, 2011a). The riparian soil-stream interface is important for DOC production in boreal forest catchment due to the strong hydrological connectivity between soils, groundwater and surface waters (Bishop et al, 1994;Laudon et al, 2011). Riparian zones are characterized by wetter conditions than upland parts of a catchment (McGlynn and McDonnell, 2003) and can react rapidly to changing groundwater levels (Bishop et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Long-term patterns in dissolved organic carbon, major elements and trace metals in boreal headwater catchments: trends, mechanisms and heterogeneity

Oni

Bishop

et al. 2013

Biogeosciences

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The boreal landscape is a complex, spatio-temporally varying mosaic of forest and mire landscape elements that control surface water hydrology and chemistry. Here, we assess long-term water quality time series from three nested headwater streams draining upland forest (C2), peat/mire (C4) and mixed (C7) (forest and mire) catchments. Acid deposition in this region is low and is further declining. Temporal trends in weather and runoff (1981–2008), dissolved organic carbon concentration [DOC] (1993–2010) and other water quality parameters (1987–2011) were assessed. There was no significant annual trend in precipitation or runoff. However, runoff increased in March and declined in May. This suggested an earlier snowmelt regime in recent years. Significant monotonic increasing trends in air temperature and length of growing season suggested a decrease in snowfall and less spring runoff. Stream [DOC] was positively correlated with some trace metals (copper, iron and zinc) and negatively with several other chemical parameters (e.g. sulfate, conductivity, calcium). Both sulfate and conductivity showed declining trends, while a significant increase was observed in pH during winter and spring. Calcium and magnesium showed monotonic decreasing trends. The declining trajectories of stream base cation and sulfate concentrations during other times of the year were not accompanied by changes in pH and alkalinity. These results indicate subtle effects of recovery from acidification. Water temperature increased significantly both annually and in most months. A simultaneous monotonic increase in iron (Fe) and [DOC] in autumn suggests co-transport of Fe-DOC in the form of organometallic complexes. A monotonic increase in UV absorbance in most months without co-occurring changes in DOC trend suggests a shift in DOC quality to a more humic-rich type. The observed increase in soil solution [DOC] and subtle trends in stream [DOC] suggest that climate rather than recovery from acidification is the dominant driver of DOC trends in the Svartberget catchment

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“…Given the global relevance of increasing river nutrient concentrations, there is a critical need to develop a thorough mechanistic understanding of the variability and controls on nutrient mobilization and export from river catchments. In particular, identification of the dominant landscape source zones that contribute to nutrient export is often challenging [Bishop et al, 1994;Pacific et al, 2010;Grabs et al, 2012], despite the importance of this for their effective management.…”

Section: Introductionmentioning

confidence: 99%

High‐frequency monitoring of catchment nutrient exports reveals highly variable storm event responses and dynamic source zone activation

et al. 2017

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Storm events can drive highly variable behavior in catchment nutrient and water fluxes, yet short‐term event dynamics are frequently missed by low‐resolution sampling regimes. In addition, nutrient source zone contributions can vary significantly within and between storm events. Our inability to identify and characterize time‐dynamic source zone contributions severely hampers the adequate design of land use management practices in order to control nutrient exports from agricultural landscapes. Here we utilize an 8 month high‐frequency (hourly) time series of streamflow, nitrate (NO3‐N), dissolved organic carbon (DOC), and hydroclimatic variables for a headwater agricultural catchment. We identified 29 distinct storm events across the monitoring period. These events represented 31% of the time series and contributed disproportionately to nutrient loads (42% of NO3‐N and 43% of DOC) relative to their duration. Regression analysis identified a small subset of hydroclimatological variables (notably precipitation intensity and antecedent conditions) as key drivers of nutrient dynamics during storm events. Hysteresis analysis of nutrient concentration‐discharge relationships highlighted the dynamic activation of discrete NO3‐N and DOC source zones, which varied on an event‐specific basis. Our results highlight the benefits of high‐frequency in situ monitoring for characterizing short‐term nutrient fluxes and unraveling connections between hydroclimatological variability and river nutrient export and source zone activation under extreme flow conditions. These new process‐based insights, which we summarize in a conceptual model, are fundamental to underpinning targeted management measures to reduce nutrient loading of surface waters.

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Identification of the riparian sources of aquatic dissolved organic carbon

Cited by 69 publications

References 7 publications

Regulation of stream water dissolved organic carbon (DOC) concentrations during snowmelt; the role of discharge, winter climate and memory effects

Regulation of stream water dissolved organic carbon (DOC) concentrations during snowmelt; the role of discharge, winter climate and memory effects

Long-term patterns in dissolved organic carbon, major elements and trace metals in boreal headwater catchments: trends, mechanisms and heterogeneity

High‐frequency monitoring of catchment nutrient exports reveals highly variable storm event responses and dynamic source zone activation

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