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Steedman, Robert J.; Lehmann, Renate; Peters, Robert H.

doi:10.1023/a:1005239721834

Cited by 23 publications

(7 citation statements)

References 25 publications

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“…Carignan et al (2000), France et al (2000), Lamontagne et al (2000), Steedman (2000), Pinel-Alloul et al (2002), O'Driscoll et al (2006), and Bertolo and Magnan (2007) all reported increased DOC concentrations in boreal lakes (usually~2 to 5 times) after clear-cut logging, even when riparian buffers were retained along lake shores. These studies indicate increased DOC export from logged watersheds.…”

Section: Carbonmentioning

confidence: 94%

Logging impacts on the biogeochemistry of boreal forest soils and nutrient export to aquatic systems: A review

2008

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Logging disturbances in boreal forest watersheds can alter biogeochemical processes in soils by changing forest composition, plant uptake rates, soil conditions, moisture and temperature regimes, soil microbial activity, and water fluxes. In general, these changes have often led to short-term increases in soil nutrient availability followed by increased mobility and losses by leaching to receiving waters. Among the studies we reviewed, dissolved organic carbon (DOC) exports usually increased after logging, and nitrogen (N) mineralization and nitrification often increased with resulting increased N availability and exports to receiving waters. Similar processes and responses occurred for phosphorus (P), but to a lesser extent than for N. In most cases, base cations were released and exported to receiving waters after logging. Several studies demonstrated that stem-only or partial-harvest logging reduced the impacts on nutrient release and exports in comparison to whole-tree clear-cutting. Despite these logging-induced increases in soil nutrient availability and movement to receiving waters, most studies reported little or no change in soil chemical properties. However, responses to logging were highly variable and often site specific. The likelihood, extent and magnitude of logging impacts on soil nutrient cycling and exports in boreal forest watersheds will be dependent on soil types, stand and site conditions, hydrological connectivity, post-logging weather patterns, and type and timing of harvest activities. Additionally, logging impacts can interact with, and be confounded by, atmospheric pollutant deposition and climate change. Further watershed-level empirical studies and modeling efforts are required to elucidate these interactions, to improve predictive capabilities, and to advance forest management guidelines for sustaining forest soil productivity and limiting nutrient exports.Résumé : Les perturbations causées par la récolte du bois dans les bassins versants de la forêt boréale peuvent affecter les processus biochimiques des sols en modifiant la composition de la forêt, les taux d'absorption par les plantes, les conditions du sol, les régimes de température et d'humidité, l'activité des microorganismes du sol, et les mouvements de l'eau. En général, ces modifications engendrent souvent des augmentations de courte durée de la disponibilité des nutriments du sol, suivi par une augmentation de la mobilité et des pertes par lessivage vers les eaux réceptrices. Les études analysées font état d'une augmentation des exportations de carbone organique dissout (DOC) après la coupe, et d'une minéralisation de l'azote (N) avec une augmentation fréquente de la nitrification conduisant à une augmentation de la disponibilité de N et son exportation vers les eaux réceptrices. On observe des processus et réactions similaires pour le phosphore (P), mais à un moindre degré que pour le N. Dans la plupart des cas, il y a relâchement des cations basiques et exportation vers les eaux réceptrices après la coupe. Plusieurs étud...

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Section: Carbonmentioning

confidence: 94%

Logging impacts on the biogeochemistry of boreal forest soils and nutrient export to aquatic systems: A review

2008

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“…In addition to the sediments from erosion, Steedman and France (2000) found that wind-blown sediment from black sprucejack pine clearcuts, roads, and skid trails, where soil disturbance is large and able to reach the lake, may have led to elevated levels of littoral sedimentation, although it was thought this mechanism would not cause important changes in water quality. Although some studies do not examine sedimentation directly, many have found that water clarity is reduced by timber harvesting over a variable range in time (one to four years) following harvest France et al 2000;Steedman 2000;Steedman and Kushneriuk 2000;Knapp et al 2003;Garcia et al 2007;Bertolo and Magnan 2007;Winkler et al 2009) although one study found no effect on water clarity (Prepas et al 2001a). …”

Section: Suspended Sedimentsmentioning

confidence: 99%

“…A rise in groundwater level following timber harvesting can mobilize DOC both during peak and base flow conditions (Laudon et al 2009). Most studies reviewed found an increase in surface water DOC concentrations following harvest that were maintained for a few years followed by a decline towards pre-harvest conditions in lakes France et al 2000;Garcia et al 2007;Lamontagne et al 2000;Steedman 2000;Bertolo and Magnan 2007;Hausmann and Pienitz 2009;Winkler et al 2009). A few studies reviewed showed no effect in streams (Hillman et al 1997) or lakes (Knapp et al 2003;Desrosiers et al 2006), and one study showed a negative effect in lakes (France et al 1996) of harvesting on surface water DOC concentrations.…”

Section: Dissolved Organic Carbon and Nutrientsmentioning

confidence: 99%

Impacts and prognosis of natural resource development on water and wetlands in Canada’s boreal zone

et al. 2015

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Industrial development within Canada's boreal zone has increased in recent decades. Forest management activities, pulp and paper operations, electric power generation, mining, conventional oil and gas extraction, nonconventional oil sand development, and peat mining occur throughout the boreal zone with varying impacts on water resources. We review impacts of these industries on surface water, groundwater, and wetlands recognizing that heterogeneity in the dominance of different hydrologic processes (i.e., precipitation, evapotranspiration, groundwater recharge, and runoff generation) across the boreal zone influences the degree of impacts on water resources. Through the application of best management practices, forest certification programs, and science-based guidelines, timber, pulp and paper, and peat industries have reduced their impacts on water resources, although uncertainties remain about long-term recovery following disturbance. Hydroelectric power developments have moved toward reducing reservoir size and creating more natural flow regimes, although impacts of aging infrastructure and dam decommissioning is largely unknown. Mineral and metal mining industries have improved regulation and practices, but the legacy of abandoned mines across the boreal zone still presents an ongoing risk to water resources. Oil and gas industries, including non-conventional resources such as oil sands, is one of the largest industrial users of water and, while significant progress has been made in reducing water use, more work is needed to ensure the protection of water resources. All industries contribute to atmospheric deposition of pollutants that may eventually be released to downstream waters. Although most industrial sectors strive to improve their environmental performance with regards to water resources, disruptions to natural flow regimes and risks of degraded water quality exist at local to regional scales in the boreal zone. Addressing the emerging challenge of managing the expanding, intensifying, and cumulative effects of industries in conjunction with other stressors, such as climate change and atmospheric pollution, across the landscape will aid in preserving Canada's rich endowment of water resources.Key words: natural resources, development, hydrology, biogeochemistry, cumulative effects, water quality, water quantity. Résumé :Le développement industriel dans la zone boréale canadienne s'est accru au cours des récentes décades. Les activités en aménagement forestier, les opérations dans les pâtes et papiers, la génération de pouvoir électrique, les mines, l'extraction de l'huile et du gaz conventionnel, le développement non conventionnel des sables bitumineux ainsi que le prélèvement de la tourbe s'effectuent sur l'ensemble de la zone boréale avec divers impacts sur les ressources hydriques. Les auteurs passent en revue les impacts de ces industries sur l'eau de surface, l'eau souterraine et les terrains humides, tout en reconnaissant que l'hétérogénéité de la dominance des différents processus ...

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“…Fires, both naturally occurring and anthropogenic, are global phenomena [Flannigan et al, 2009] that may have widespread impacts on the UV environment of lakes [France et al, 2000] and oceans [Herman et al, 1997]. Fires can alter the transparency of water bodies locally by depositing ash and particulates, either directly or via later erosion and runoff from burned watersheds.…”

Section: Introductionmentioning

confidence: 99%

Vertical redistribution of zooplankton in an oligotrophic lake associated with reduction in ultraviolet radiation by wildfire smoke

Urmy

Williamson

Leach

et al. 2016

Geophysical Research Letters

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We used a natural experiment to test whether wildfire smoke induced changes in the vertical distribution of zooplankton in Lake Tahoe by decreasing incident ultraviolet radiation (UV). Fires have a variety of effects on aquatic ecosystems, but these impacts are poorly understood and have rarely been observed directly. UV is an important driver of zooplankton vertical migration, and wildfires may alter it over large spatial scales. We measured UV irradiance and the distribution of zooplankton on two successive days. On one day, smoke haze from a nearby wildfire reduced incident UV radiation by up to 9%, but not irradiance in the visible spectrum. Zooplankton responded by positioning themselves, on average, 4.1 m shallower in the lake. While a limited data set such as this requires cautious interpretation, our results suggest that smoke from wildfires can change the UV environment and distribution of zooplankton. This process may be important in drought‐prone regions with increasingly frequent wildfires, and globally due to widespread biomass burning.

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Untitled

Cited by 23 publications

References 25 publications

Logging impacts on the biogeochemistry of boreal forest soils and nutrient export to aquatic systems: A review

Logging impacts on the biogeochemistry of boreal forest soils and nutrient export to aquatic systems: A review

Impacts and prognosis of natural resource development on water and wetlands in Canada’s boreal zone

Vertical redistribution of zooplankton in an oligotrophic lake associated with reduction in ultraviolet radiation by wildfire smoke

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