Partitioning the impact of environmental factors on lake concentrations and catchment budgets for base cations in forested ecosystems

Augustin, Fougère; Houle, Daniel; Gagnon, Christian; Couture, Suzanne; Courchesne, François

doi:10.1016/j.apgeochem.2014.11.013

Cited by 10 publications

(9 citation statements)

References 53 publications

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“…Such conditions would lengthen the period during which weathering reactions are taking place in addition to the soils being warmer, thereby potentially increasing the annual weathering rate. For forested catchments of eastern Canada, the length of the growing season was positively correlated with BC WR (Augustin et al, 2015b(Augustin et al, , 2018.…”

Section: Future Changes In Bc Weathering Ratesmentioning

confidence: 98%

“…Higher weathering rates driven by increasing temperatures was also suggested to explain increased alkalinity and pH of lake waters for 47 temperate and boreal catchments in the province of Quebec, Canada (Houle et al, 2010). More recently, it was shown that MAAT and precipitation had a positive effect on BC budget and concentrations in lake water across 72 forested catchments of eastern Canada (Augustin et al, 2015b). Results reported by Li et al (2016) also showed a strong positive correlation between mean annual temperature and the rate of CO 2 consumption associated with the weathering of basaltic rocks.…”

Section: Introductionmentioning

confidence: 97%

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Impact of Climate Change on Soil Hydro-Climatic Conditions and Base Cations Weathering Rates in Forested Watersheds in Eastern Canada

Houle

Marty

Augustin

et al. 2020

Front. For. Glob. Change

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Increases in mean annual air temperature (MAAT) and mean annual precipitation (MAP) are projected for north eastern North America, which will alter soil hydroclimatic conditions and hence the rate of many soil processes. Among them, chemical weathering of soil minerals is an essential source of base cations (BC) which controls the acid-base status of surface waters and is crucial for forest nutrition. In this modeling study, MAAT and MAP projections from a regional and a global climate models were first used to project changes in soil temperature (MAST) and soil water content (SWC) with the ForStem and ForHym models for 21 eastern Canadian forested catchments. The models predicted an increase in MAST by 2.03-2.05 • C and 2.87-3.42 • C for the 2041-2070 and 2071-2100 periods, respectively, and a small decrease (<5%) in SWC. In a second step, these projected changes in MAST and SWC were used to estimate changes in BC weathering rates (WR) and soil pH with the geochemical model PROFILE. The simulations indicated that BC WR would increase by 13-15% and 20-22% for the 2041-2070 and 2071-2100 periods, respectively. The increase in BC WR was accompanied by an increase not only in base cation concentrations, but also in soil pH at most sites, suggesting that future temperature increase has the potential to ameliorate the acid-base status and the fertility of soils in eastern Canada through its impact on WR.

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Section: Future Changes In Bc Weathering Ratesmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 97%

Impact of Climate Change on Soil Hydro-Climatic Conditions and Base Cations Weathering Rates in Forested Watersheds in Eastern Canada

Houle

Marty

Augustin

et al. 2020

Front. For. Glob. Change

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“…The inter‐annual fluctuation or variation in lake concentration can be explained statistically by its explanatory variables using one of three correlation approaches: Pearson's linear correlation (e.g. Mitchell et al ., ; Murray and Conner, ; Augustin et al ., ); the non‐parametric, rank‐based Spearman correlation and Kendall correlation (Helsel and Hirsch, ). Here the Spearman's correlation was tried, and Ca was used as an example, as Ca behaved similarly to other cations.…”

Section: Discussionmentioning

confidence: 99%

“…Augustin et al . () examined a broader set of 72 lakes from the same region of Quebec using a similar regression approach, which suggested that air temperature was positively associated with concentrations of base cations and annual precipitation was positively correlated to Na budgets in catchments. Several other studies comment on the importance and influence of climate on lake chemistry via changes in stream hydrology and chemistry (e.g.…”

Section: Introductionmentioning

confidence: 99%

Relative contributions of stream concentration, stream discharge and shoreline load to base cation trends in Red Chalk and Harp lakes, south-central Ontario, Canada

et al. 2015

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Abstract:We evaluated the importance and contributions of changes in stream base cation concentration, stream discharge and lake shoreline load to changes in base cation concentrations in two small inland lakes in south-central Ontario. The shoreline load from ungauged drainage areas was calculated with a mass balance equation. An evaluation method based on the partial MannKendall test quantified the relative contributions of these three explanatory drivers to the observed trends in lake concentration of Ca, K, Mg and Na. Over a 29-year period at Red Chalk and Harp lakes, declines in stream concentration and discharge were correlated with the declines in lake concentrations of all base cations (except for Na in Harp Lake), with contributions of 21-81% from stream concentration and 12-58% from discharge, whereas the shoreline load had little contribution to observed trends. The observed unusual increase in Na concentration at Harp Lake was correlated with the increase in stream Na concentration and additional load from road salts, with the shoreline load contributing a substantial 37%. These results may be applicable to numerous inland lakes with similar site conditions, including lakes found on the Canadian Shield.

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“…This network of watersheds was established and has been monitored since the early 1980. They have been the subject of numerous publications which presented detailed data about their geographic location, terrestrial area and topographic features (Gagnon et al, 1994;Siltanen et al, 1997;Houle et al, 2012a;Augustin et al, 2015). Most of the watershed characteristics were taken from Houle et al (2012a) or computed using ArcGIS and the Digital Canadian Elevation Data of 90 meter resolution (McDonnell and Kemp, 1995).…”

Section: Data Sources Variables Assessed and Methodsmentioning

confidence: 99%

Long-term base cation weathering rates in forested catchments of the Canadian Shield

et al. 2015

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Partitioning the impact of environmental factors on lake concentrations and catchment budgets for base cations in forested ecosystems

Cited by 10 publications

References 53 publications

Impact of Climate Change on Soil Hydro-Climatic Conditions and Base Cations Weathering Rates in Forested Watersheds in Eastern Canada

Impact of Climate Change on Soil Hydro-Climatic Conditions and Base Cations Weathering Rates in Forested Watersheds in Eastern Canada

Relative contributions of stream concentration, stream discharge and shoreline load to base cation trends in Red Chalk and Harp lakes, south-central Ontario, Canada

Long-term base cation weathering rates in forested catchments of the Canadian Shield

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