Influence of catchment topography on water chemistry in southeastern Québec Shield lakes

D'Arcy, Pierre; Carignan, Richard

doi:10.1139/f97-129

Cited by 155 publications

(71 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These lakes are found in similarly sloped terrain, with a small proportion of wetlands in their catchment. It is nevertheless surprising that eastern boreal Shield lakes (eastern Quebec; D'Arcy and Carignan 1997) are not related to any of the catchment variables in our analysis and do not fit the usual patterns with catchment area and drainage ratio of the Precambrian Shield lakes in the Experimental Lakes Area (northwestern Ontario). In their analysis, D'Arcy and Carignan (1997) did find a relationship between DOC and catchment slope and total open lake area (the study lake and other lakes in the catchment, equal to LLPOW in Fig.…”

Section: Discussioncontrasting

confidence: 56%

Regional comparisons of watershed determinants of dissolved organic carbon in temperate lakes from the Upper Great Lakes region and selected regions globally

Xenopoulos

Lodge

Frentress

et al. 2003

Limnology & Oceanography

156

125

View full text Add to dashboard Cite

We analyzed how dissolved organic carbon (DOC) concentration in lakes of the North American temperate forest (Upper Great Lakes region) is related to nine catchment characteristics (lake area, lake perimeter, drainage area, ratio of drainage area to lake area, proportion of watershed occupied by wetlands, proportion of lake perimeter in wetlands, shoreline development, elevation, and watershed slope) and compared selected relationships to those from other regions across the globe. For the temperate lakes, the proportion of the lake perimeter and the proportion of the watershed occupied by wetlands were the best predictors of DOC in both univariate (r 2 ϭ 0.34 and 0.30, respectively) and multivariate regression models. Forested wetlands, in particular those with coniferous vegetation, explained the largest proportion of lake DOC variability. Wetlands with scrub-shrubs and emergent vegetation explained very little or no variability. Secondary to wetlands, lake DOC decreased with lake area and watershed slope. When we combined the temperate lake data set with that of 10 other geographical regions of the world (ranging from subtropical to tundra), the only two variables significant in predicting DOC were proportion of wetlands in the watershed (r 2 ϭ 0.36) and lake elevation (r 2 ϭ 0.34). We conclude that regional or small-scale DOC models likely have limited applicability in predicting DOC in other geographical areas of the world.

show abstract

Section: Discussioncontrasting

confidence: 56%

Regional comparisons of watershed determinants of dissolved organic carbon in temperate lakes from the Upper Great Lakes region and selected regions globally

Xenopoulos

Lodge

Frentress

et al. 2003

Limnology & Oceanography

156

125

View full text Add to dashboard Cite

show abstract

“…In our lakes, DOC concentrations varied negatively with watershed slope, and this is true also of shield lakes (Rasmussen et al 1989;D'Arcy and Carignan 1997). However, the average watershed slope is nearly twice as steep for shield lakes as it is in the Townships (Laurentian Shield, 8.8Њ and Townships, 4.8Њ; Laurentian Shield lakes data, R. Carignan pers.…”

Section: The Summer Metabolic Balance In the Epilimnion Of Southeastesupporting

confidence: 50%

The summer metabolic balance in the epilimnion of southeastern Quebec lakes

Prairie

Bird

Cole

2002

Limnology & Oceanography

197

172

View full text Add to dashboard Cite

On the basis of data collected in Quebec lakes, del Giorgio and Peters (1994) and Carignan et al. (2000) have come to opposite conclusions regarding the metabolic balance between heterotrophy and autotrophy in lakes in general. In the present study, epilimnetic oxygen and carbon dioxide saturation was measured in 33 lakes from the St. Lawrence Lowlands region of Quebec to examine the extent of epilimnetic net heterotrophy (i.e., O2:CO2 balance) in lakes of different characteristics. We found that ~75% of the lakes were undersaturated with oxygen and supersaturated with CO2. There was a strong negative relationship between the departures of O2 and CO2 from saturation. What has not been noted elsewhere is that oxygen concentrations were negatively related to dissolved organic carbon (DOC) concentration, and, therefore, metabolic gas balances could be predicted from DOC; a value between 4 and 6 mg L−1 DOC corresponds to metabolic equilibrium. Because most of the lakes in del Giorgio and Peters (1994) had DOC concentrations above this threshold and most lakes in Carignan et al. (2000) were below, their apparently contradictory conclusions can be reconciled within a larger general theory. Contrary to studies elsewhere, however, we found that the degree of oxygen undersaturation increased with lake trophic status, expressed either as total phosphorus or nitrogen concentrations.

show abstract

“…Resolving nutrient leaching rates of various diffuse sources may help watershed sustainability management maintaining required water quality and maximizing agricultural activity for food production. However, the contributions from various diffuse sources are difficult to identify owing to the spatial and temporal heterogeneity of hydrological processes and agricultural activities (D'Arcy and Carignan, 1997;Herlihy et al, 1998;Hooke, 1999;Johnson et al, 2000). Moreover, diffuse pollution sources are region-dependent and are related to different environmental settings and agricultural behaviors.…”

Section: Introductionmentioning

confidence: 99%

Land use effect and hydrological control on nitrate yield in subtropical mountainous watersheds

Huang

Lee

Kao

et al. 2012

Hydrol. Earth Syst. Sci.

View full text Add to dashboard Cite

Abstract. Nitrate export in small subtropical watersheds is rarely observed and the estimation of individual land use nitrate yield from a mixed combination within catchments has scarcely been studied. In this study the nitrate concentrations at 16 nested catchments in the Chi-Chia-Wan watershed in Central Taiwan were measured during [2007][2008]. A 3-layer TOPMODEL was applied to estimate daily discharge for ungauged sub-catchments. The observed nitrate concentrations and the simulated discharges were used for nitrate flux estimations through four flux methods. Meanwhile, a new deconvolution computation was developed to resolve the nitrate yield of each land use from within the mixed combinations.The results showed that the observed mean NO 3 -N concentration in relatively pristine catchments was approximately 0.145 ± 0.103 mg l −1 , which is comparable with other forestry catchments around the world. However, the higher rainfall/runoff, substantial N deposition, and other nitrogen sources resulted in significantly higher annual export of approximately 238-1018 kg-N km −2 yr −1 . Our deconvolution computation showed that the background yield of natural forestry was ∼351 ±62 kg-N km −2 yr −1 . On the other hand, the extremely high nitrate yield of active farmland was ∼308, 170 ± 19 241 kg-N km −2 yr −1 due to overfertilization. The deconvolution computation technique is capable of tracing the mixed signals at the outlet back to the nitrate productions from varied land use patterns. It advances the application of river monitoring network. The typical values of nitrate yields can serve as a guideline for land management. Comparing the nitrogen input and output, we found some nitrogen missing in the cycling which may indicate certain removal processes and we therefore suggest further study to be carried out to fully understand nitrogen cycling in subtropics.

show abstract

Influence of catchment topography on water chemistry in southeastern Québec Shield lakes

Cited by 155 publications

References 28 publications

Regional comparisons of watershed determinants of dissolved organic carbon in temperate lakes from the Upper Great Lakes region and selected regions globally

Regional comparisons of watershed determinants of dissolved organic carbon in temperate lakes from the Upper Great Lakes region and selected regions globally

The summer metabolic balance in the epilimnion of southeastern Quebec lakes

Land use effect and hydrological control on nitrate yield in subtropical mountainous watersheds

Contact Info

Product

Resources

About