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

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

“…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.…”

“…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.…”

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

“…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.…”

“…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.…”

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

“…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).…”