Decreasing soil water Ca2+ reduces DOC adsorption in mineral soils: Implications for long-term DOC trends in an upland forested catchment in southern Ontario, Canada

Kerr, Jason G.; Eimers, M. Catherine

doi:10.1016/j.scitotenv.2012.04.016

Cited by 35 publications

(19 citation statements)

References 59 publications

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“…Therefore, significant decline in calcium (both overall and monthly) in our catchment can be attributed to depleting soil reserves in the catchment as a result of continuous leaching and/or intermittent drought-like conditions induced by several dry-wet years in our study. Declining soil water calcium can reduce DOC adsorption in mineral soils through a cation bridging mechanism and as a result contribute to long-term increasing DOC trends in streams draining upland catchments (Kerr and Eimers, 2012). This is because sorption equilibrium is an important mechanism controlling DOC at the soil-water interface.…”

Section: Linkage Between Deposition Stream Doc and Other Chemical Pamentioning

confidence: 99%

“…Our results showed that sodium had no significant monotonic trend either monthly (except June) or overall. It has been shown that sodium has little or no effect on the DOC adsorption (Kerr and Eimers, 2012) as divalent cations (e.g. calcium) are more important in cation bridge formation than sodium which is monovalent (Munch et al, 2002).…”

Section: Linkage Between Deposition Stream Doc and Other Chemical Pamentioning

confidence: 99%

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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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Section: Linkage Between Deposition Stream Doc and Other Chemical Pamentioning

confidence: 99%

Section: Linkage Between Deposition Stream Doc and Other Chemical Pamentioning

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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“…To our knowledge, this procedure has only been used by Burns et al [55], after hyperbolic or log regression fit of the data. Other authors mention the use of the partial MK test with discharge or other parameters as covariates [24,40].…”

Section: Trend Detection and Quantificationmentioning

confidence: 99%

Long-term Trends of Organic Carbon Concentrations in Freshwaters: Strengths and Weaknesses of Existing Evidence

Filella

Rodríguez-Murillo

2014

Water

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Many articles published in the last few years start with the assumption that the past decades have seen an increase in dissolved organic carbon (DOC) concentrations in the rivers and lakes of the Northern Hemisphere. This study analyses whether the existing evidence supports this claim. With this aim, we have collected published studies where long series of organic carbon concentrations (i.e., longer than 10 years) were analyzed for existing trends and have carefully evaluated the 63 articles found. Information has been collated in a comprehensive and comparable way, allowing readers to easily access it. The two main aspects considered in our analysis have been the analytical methods used and the data treatment methods applied. Both are sensitive issues because, on the one hand, the difficulties associated with correctly determining organic carbon concentrations in surface waters are well known, while, on the other, dealing with real environmental data (i.e., lack of normality, censoring, missing values, etc.) is an extremely intricate matter. Other issues such as data reporting and the geographical location of the systems studied are also discussed. In conclusion, it is clear that organic carbon concentrations have increased in some surface waters in the Northern Hemisphere since the 1990s. However, due to a lack of data in many parts of the world, it is not known whether this phenomenon is general and, more importantly, in the areas for which such data do exist, the reporting and methodological problems in the published studies prevent any conclusion on the existence of a general temporal behavior of organic carbon from being drawn.

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“…Furthermore, Na + has the ability to remove divalent bridges between clay mineral surfaces and organic anions [27]. More recently, while examining the potential reasons for increased DOC in surface waters in Canada, Kerr and Elmers [28] reported that declining Ca 2+ in soil solution resulted in equilibrium DOC increasing, indicative that changes in DOC adsorption on exchange sites may be caused by cation bridging or the lack thereof. A recent study in California examined the use of wastewater effluent as an alternative irrigation water source for urban landscapes and concluded that pH, SAR and DOC of wastewater was high enough to reduce soil infiltration rate and aggregate stability in soils [29] Thus, based on this prior research on the interaction between Na + and organic matter and the results from our study, we suggest that the major mechanism of DOC and DON release from urban landscapes irrigated with high Na + municipal water is likely to be a combination of Na + exchange with cations on soil exchange sites, followed by calcium-DOC decomplexation and a consequential displacement of adsorbed organic DOC and DON from soil exchange sites to pore water.…”

Section: Effect Of Na + On Doc and Don Fluxesmentioning

confidence: 99%

Effect of Sodic Irrigation Water on Organic Carbon and Nitrogen Concentrations, Fluxes and Exports from Newly Installed St. Augustine Grass Sod in South-Central Texas

Ja¹,

Ch²,

Jc³

et al. 2018

J Hortic

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Decreasing soil water Ca2+ reduces DOC adsorption in mineral soils: Implications for long-term DOC trends in an upland forested catchment in southern Ontario, Canada

Cited by 35 publications

References 59 publications

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

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

Long-term Trends of Organic Carbon Concentrations in Freshwaters: Strengths and Weaknesses of Existing Evidence

Effect of Sodic Irrigation Water on Organic Carbon and Nitrogen Concentrations, Fluxes and Exports from Newly Installed St. Augustine Grass Sod in South-Central Texas

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