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• W1984407612 endingPage "722" @default.
• W1984407612 startingPage "708" @default.
• W1984407612 abstract "Spatial and temporal patterns in streamwater acidity are ecologically important, but difficult to measure in parallel. Here we present the spatial distribution of streamwater chemistry relevant to acidity from 60 stream sites distributed throughout a 67 km2 boreal catchment, sampled during a period of winter baseflow (high pH) and during a spring flood episode (low pH). Sites were grouped based on pH level and pH change from winter baseflow to spring flood. The site attributes of each pH group were then assessed in terms of both stream chemistry and subcatchment landscape characteristics. Winter baseflow pH was high throughout most of the stream network (median pH 6.4), but during the spring flood episode stream sites experienced declines in pH ranging from 0–1.6 pH units, resulting in pH ranging from 4.3–6.3. Spring flood pH was highest in larger, lower altitude catchments underlain by fine sorted sediments, and lowest in small, higher altitude catchments with a mixture of peat wetlands and forested till. Wetland-dominated headwater catchments had low but stable pH, while the spring flood pH drop was largest in a group of catchments of intermediate size which contained well-developed coniferous forest and a moderate proportion of peat wetlands. There was a trend with distance downstream of higher pH, acid neutralizing capacity (ANC) and base cation concentrations together with lower dissolved organic carbon (DOC, strongly negatively correlated with pH). This apparent scale-dependence of stream chemistry could be explained by a number of environmental factors which vary predictably with altitude, catchment area and distance downstream—most notably, a shift in surficial sediment type from unsorted till and peat wetlands to fine sorted sediments at lower altitudes in this catchment. As a result of the combination of spatial heterogeneity in landscape characteristics and scale-related processes, boreal catchments like this one can be expected to experience high spatial variability both in terms of chemistry at any given point in time, and in the change experienced during high discharge episodes. Although chemistry patterns showed associations with landscape characteristics, considerable additional variability remained, suggesting that the modeling of dynamic stream chemistry from map parameters will continue to present a challenge." @default.
• W1984407612 created "2016-06-24" @default.
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• W1984407612 creator A5038023958 @default.
• W1984407612 date "2008-12-15" @default.
• W1984407612 modified "2023-10-15" @default.
• W1984407612 title "Spatial heterogeneity of the spring flood acid pulse in a boreal stream network☆" @default.
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• W1984407612 doi "https://doi.org/10.1016/j.scitotenv.2008.10.006" @default.
• W1984407612 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18940271" @default.
• W1984407612 hasPublicationYear "2008" @default.
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