Response of the Lake Clair Watershed (Duchesnay, Quebec) to changes in precipitation chemistry (1988-1994)

Houle, Daniel; Paquin, Raynald; Camiré, Claude; Ouimet, Rock; Duchesne, Louis

doi:10.1139/x97-143

Cited by 82 publications

(71 citation statements)

References 24 publications

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“…The observed excess S export corresponds well with numerous studies in northeastern North America (Norton et al 1988;Mitchell et al 1992Mitchell et al , 1996Driscoll et al 1995;Houle and Carignan 1995;Houle et al 1997;Eimers and Dillon 2002). Houle and Carignan (1995) concluded that mineralisation of soil organic S was the likely candidate for the excess S source after accounting for dry deposition, SO 4 desorption, and weathering of S bearing minerals as potential S sources at the Lake Laflamme watershed.…”

Section: Watershed Budgetssupporting

confidence: 85%

“…This was expected given the site's northern location which is distant from pollution sources. The absence of a decrease in deposition and precipitation concentration for SO 4 contrasts with many other sites in the northeastern USA (Butler et al 2000;Likens et al 2001) and eastern Canada (Clair et al 1995;Houle et al 1997). This could be due to the relatively short data period (8 years) and also to the different periods of time that are compared.…”

Section: Precipitation: Composition and Trendsmentioning

confidence: 79%

“…Numerous reports of decreased availability of soil basic cations have suggested that this phenomenon may be widespread in mixed-or deciduous-forests of northeastern USA and eastern Canada (Kirchner 1995;Likens et al 1996;Houle et al 1997;Watmough and Dillon 2003). Other studies have also suggested that tree growth may be affected at certain sites (Ouimet et al 2001;Duchesne et al 2002).…”

Section: Introductionmentioning

confidence: 99%

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Base Cation Cycling in a Pristine Watershed of the Canadian Boreal Forest

Duchesne

Houle

2006

Biogeochemistry

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Base cation cycling was investigated on the Canadian Shield in a pristine catchment of the boreal forest. An input-output budget (atmospheric deposition -stream exports) for the whole watershed indicated that nitrogen (N) was strongly retained, while sulphur (S) and base cations (K, Ca, Mg) were lost. The S losses are attributed to internal sources, such as SO 4 desorption and/or mineralisation of soil organic-S. The base cation losses at the catchment scale, however, might be contributed by weathering of the till below the rooting zone, which has little ecological significance. For this reason, a detailed budget of basic cations, including atmospheric deposition, tree uptake, mineral weathering and leaching losses was constructed for the soil rooting zone of a stand representative of the forest covering the catchment. Different scenarios of tree uptake (whole tree and stem-only harvesting), weathering rates (PROFILE modelled values, PROFILE modelled values corrected for soil Na leaching) and soil leaching losses (depth of 22 and 81 cm) were considered. The element budgets were summed for the 1997-2003 (7 years) period. In every scenario, K was lost (À35.5 to À1.2 kg ha À1 ) from the exchangeable reservoir. Gain or losses of Ca were observable, depending of the scenario considered (28.8 to À20.1 kg ha À1 ) while Mg (À0.8 to 13.3 kg ha À1 ) generally accumulated over the 7-year period. The absolute K losses are very important, given the very small K soil exchangeable reservoir (55.2 kg ha À1 ) at the site. Because the amount of K sequestered in biomass (110 kg ha À1 ) is twice the amount found in the exchangeable soil reservoir, this forest is very sensitive to commercial forestry operations and forest harvesting appears as the main pathway of base cation losses. This raises important questions regarding the sustainability of the boreal forest that lies on K-poor soils of the Canadian Shield.

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Section: Watershed Budgetssupporting

confidence: 85%

Section: Precipitation: Composition and Trendsmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

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Base Cation Cycling in a Pristine Watershed of the Canadian Boreal Forest

Duchesne

Houle

2006

Biogeochemistry

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“…Stable isotopic analyses have shown that changes in SO 4 2-concentration at this watershed are associated with microbial redox processes (Eimers et al 2004a, b). Previous investigations at Lake Clair Watershed attributed net S losses to a combination of SO 4 2-desorption and/or organic S mineralization (Houle et al 1997). At the Hubbard Brook Experimental Forest, there has been considerable effort associated with the evaluation of S budgets since 1964 (e.g., Likens and Bormann 1995;Likens et al 2002).…”

Section: Comparisons Of Sulfur Budget Differences Among Watershedsmentioning

confidence: 99%

“…Also, the longterm temporal patterns of S deposition have been clearly linked to historical changes in SO 2 emissions (Driscoll et al , 2001Lynch et al 2000;Butler et al 2001;Likens et al 2001Likens et al , 2002. Sulfate losses in drainage waters exceed estimated atmospheric inputs for most studies that have calculated watershed S budgets in southeastern Canada (Houle and Carignan 1995;Houle et al 1997;Beall et al 2001;Eimers and Dillon 2002;Eimers and Houle 2005;Duchesne and Houle 2006) and the northeastern US (Likens and Bormann 1995;Driscoll et al 1998;Likens et al 2002;Park et al 2003). The application of biogeochemical models for estimating watershed S dynamics have also suggested discrepancies as estimated by the difference between estimated atmospheric S inputs and drainage losses as SO 4 2- (Chen et al 2004;Gbondo-Tugbawa et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Comparisons of watershed sulfur budgets in southeast Canada and northeast US: new approaches and implications

et al. 2010

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Can the eastern red‐backed salamander (Plethodon cinereus) persist in an acidified landscape?

et al. 2016

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. 2016. Can the eastern red-backed salamander (Plethodon cinereus) persist in an acidified landscape? Ecosphere 7(4):e01318. 10. 1002/ecs2.1318 Abstract. Hardwood forests of eastern North America have experienced decades of acidic deposition, leading to soil acidification where base cation supply was insufficient to neutralize acid inputs. Negative impacts of soil acidity on amphibians include disrupted embryonic development, lower growth rates, and habitat loss. However, some amphibians exhibit intraspecific variation in acid tolerance, suggesting the potential for local adaptation in areas where soils are naturally acidic. The eastern red-backed salamander (Plethodon cinereus) is a highly abundant top predator of the northern hardwood forest floor. Early research found that P. cinereus was sensitive to acidic soils, avoiding substrates with pH < 3.8 and experiencing decreased growth rates in acidic habitats. However, recent studies have documented P. cinereus populations in lower pH conditions than previously observed, suggesting some populations may persist in acidic conditions. Here, we evaluated relationships between organic horizon soil pH and P. cinereus abundance, adult health (body size and condition), and microhabitat selection, based on surveys of 34 hardwood forests in northeastern United States that encompass a regional soil pH gradient. We found no associations between soil pH and P. cinereus abundance or health, and observed that this salamander used substrates with pH similar to that available, suggesting that pH does not mediate their fine-scale distributions. The strongest negative predictor of P. cinereus abundance was the presence of dusky salamanders (Desmognathus spp.), which were most abundant in the western Adirondacks. Our results indicate that P. cinereus occupies a wider range of soil pH than has been previously thought, which has implications for their functional role in forest food webs and nutrient cycles in acid-impaired ecosystems. Tolerance of P. cinereus for more acidic habitats, including anthropogenically acidified forests, may be due to local adaptation in reproductively isolated populations and/or generalist life history traits that allow them to exploit a wider resource niche.

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Response of the Lake Clair Watershed (Duchesnay, Quebec) to changes in precipitation chemistry (1988-1994)

Cited by 82 publications

References 24 publications

Base Cation Cycling in a Pristine Watershed of the Canadian Boreal Forest

Base Cation Cycling in a Pristine Watershed of the Canadian Boreal Forest

Comparisons of watershed sulfur budgets in southeast Canada and northeast US: new approaches and implications

Can the eastern red‐backed salamander (Plethodon cinereus) persist in an acidified landscape?

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