Gregory B Lawrence (Former Employee)
Science and Products
Filter Total Items: 120
Regional target loads of atmospheric nitrogen and sulfur deposition for the protection of stream and watershed soil resources of the Adirondack Mountains, USA Regional target loads of atmospheric nitrogen and sulfur deposition for the protection of stream and watershed soil resources of the Adirondack Mountains, USA
Acidic deposition contributes to a range of environmental impacts across forested landscapes, including acidification of soil and drainage water, toxic aluminum mobilization, depletion of available soil nutrient cations, and impacts to forest and aquatic species health and biodiversity. In response to decreasing levels of acidic deposition, soils and drainage waters in some regions of...
Authors
Todd C. McDonnell, Charles T. Driscoll, Timothy J. Sullivan, Douglas A. Burns, Barry P. Baldigo, Shuai Shao, Gregory B. Lawrence
Changes in soil chemistry and foliar metabolism of Himalayan cedar (Cedrus deodara) and Himalayan spruce (Picea smithiana) along an elevational gradient at Kufri, HP, India: The potential roles of regional pollution and localized grazing Changes in soil chemistry and foliar metabolism of Himalayan cedar (Cedrus deodara) and Himalayan spruce (Picea smithiana) along an elevational gradient at Kufri, HP, India: The potential roles of regional pollution and localized grazing
We investigated changes in soil chemistry and foliar metabolism of Himalayan cedar [Cedrus deodara (Roxb. Ex Lamb.) G.Don] and Himalayan spruce [Picea smithiana (Wall.) Boiss] trees along a steep elevational gradient in the lower Himalayan Mountains at Kufri, Himachal Pradesh (HP), India. The foliar and soil samples were collected from four locations along a 300 m elevational gradient at...
Authors
Rakesh Minocha, Alexander R. Contosta, Gregory B. Lawrence, Ravinder K. Kohli, Subhash C. Minocha, Stephanie Long
Trends and current status of aluminum chemistry in Adirondack headwater streams 30 Years after the Clean Air Act Amendments of 1990 Trends and current status of aluminum chemistry in Adirondack headwater streams 30 Years after the Clean Air Act Amendments of 1990
Mobilization of toxic forms of aluminum (Ali) have been one of the most harmful effects of acidic deposition on aquatic ecosystems. Large decreases in acidic deposition levels have resulted in decreases in Ali concentrations in surface waters starting in the 1990s. However, recent studies indicate that fish communities are still being impaired by elevated Ali concentrations in streams...
Authors
Gregory B. Lawrence, Barry P. Baldigo, Karen M. Roy, Scott D. George
Have sustained acidic deposition decreases led to increased calcium availability in recovering watersheds of the Adirondack region of New York, USA? Have sustained acidic deposition decreases led to increased calcium availability in recovering watersheds of the Adirondack region of New York, USA?
Soil calcium depletion has been strongly linked to acidic deposition in eastern North America and recent studies have begun to document the recovery of soils in response to large decreases in acidic deposition. However, increased calcium availability has not yet been seen in the B horizon, where calcium depletion has been most acute, but mineral weathering is critically important for...
Authors
Gregory B. Lawrence, Jason Siemion, Michael R. Antidormi, Donald B. Bonville, Michael McHale
The response of streams to changes in atmospheric deposition of sulfur and nitrogen in the Adirondack Mountains The response of streams to changes in atmospheric deposition of sulfur and nitrogen in the Adirondack Mountains
Acidic deposition is the result of upwind sulfur (S) and nitrogen (N) emissions into the atmosphere from human activities. Environmental impacts from acidic deposition across forested landscapes include acidification of soil and drainage water, depletion of available soil nutrient bases, and impacts to and changes in forest and aquatic species composition and biodiversity. Acidic...
Authors
Charles T. Driscoll, Shuai Shao, Timothy J. Sullivan, Todd C. McDonnell, Barry P. Baldigo, Douglas A. Burns, Gregory B. Lawrence
Assessment of methods for soil monitoring in the Adirondack region of New York Assessment of methods for soil monitoring in the Adirondack region of New York
Repeated sampling to detect changes in forest soils was rarely used before 1990, but the value of soil monitoring in understanding environmental change is becoming well established. The growing number of resampling studies has shown that sampling designs and procedures must be adapted to the objectives of the monitoring program and the soils being monitored. In the Adirondack region...
Authors
Gregory B. Lawrence, Michael R. Antidormi
Reversal of forest soil acidification in the northeastern United States and eastern Canada: Site and soil factors contributing to recovery Reversal of forest soil acidification in the northeastern United States and eastern Canada: Site and soil factors contributing to recovery
As acidic deposition has decreased across Eastern North America, forest soils at some sites are beginning to show reversal of soil acidification. However, the degree of recovery appears to vary and is not fully explained by deposition declines alone. To assess if other site and soil factors can help to explain degree of recovery from acid deposition, soil resampling chemistry data (8- to...
Authors
P.W. Hazlett, C.E. Emilson, Gregory B. Lawrence, I. J. Fernandez, R. Ouimet, Scott Bailey
The response of stream ecosystems in the Adirondack region of New York to historical and future changes in atmospheric deposition of sulfur and nitrogen The response of stream ecosystems in the Adirondack region of New York to historical and future changes in atmospheric deposition of sulfur and nitrogen
The present-day acid-base chemistry of surface waters can be directly linked to contemporary observations of acid deposition; however, pre-industrial conditions are key to predicting the potential future recovery of stream ecosystems under decreasing loads of atmospheric sulfur (S) and nitrogen (N) deposition. The integrated biogeochemical model PnET-BGC was applied to 25 forest...
Authors
Shuai Shao, Charles T. Driscoll, Timothy J. Sullivan, Douglas A. Burns, Barry P. Baldigo, Gregory B. Lawrence, Todd C. McDonnell
Chronic and episodic acidification of streams along the Appalachian Trail corridor, eastern United States Chronic and episodic acidification of streams along the Appalachian Trail corridor, eastern United States
Acidic atmospheric deposition has adversely affected aquatic ecosystems globally. As emissions and deposition of sulfur (S) and nitrogen (N) have declined in recent decades across North America and Europe, ecosystem recovery is evident in many surface waters. However, persistent chronic and episodic acidification remain important concerns in vulnerable regions. We evaluated acidification...
Authors
Douglas A. Burns, Todd McDonnell, Karen C. Rice, Gregory B. Lawrence, Timothy Sullivan
Declining aluminum toxicity and the role of exposure duration on brook trout mortality in acidified streams of the Adirondack Mountains, New York, USA Declining aluminum toxicity and the role of exposure duration on brook trout mortality in acidified streams of the Adirondack Mountains, New York, USA
Mortality of brook trout Salvelinus fontinalis and water chemistry were characterized in 6 headwater streams in the western Adirondacks of New York during spring 2015, 2016, and 2017 and compared with results from analogous tests done between 1980 and 2003 in many of the same streams, to assess temporal changes in toxicity and inorganic monomeric aluminum (Ali) concentrations, and the...
Authors
Barry P. Baldigo, Scott George, Gregory B. Lawrence, Eric A. Paul
Recovery of soils from acidic deposition may exacerbate nitrogen export from forested watersheds Recovery of soils from acidic deposition may exacerbate nitrogen export from forested watersheds
Effects of ambient decreases in N deposition on forest N cycling remain unclear as soils recover from acidic deposition. To investigate, repeated soil sampling data were related to deposition, vegetation, and stream data, for 2000–2015 in North and South Buck Creek watersheds, in the Adirondack region of New York, USA. In 63 other Adirondack streams, NO3− concentrations were also...
Authors
Gregory B. Lawrence, Sara E. Scanga, Robert D. Sabo
Widespread diminishing anthropogenic effects on calcium in freshwaters Widespread diminishing anthropogenic effects on calcium in freshwaters
Calcium (Ca) is an essential element for almost all living organisms. Here, we examined global variation and controls of freshwater Ca concentrations, using 440 599 water samples from 43 184 inland water sites in 57 countries. We found that the global median Ca concentration was 4.0 mg L−1 with 20.7% of the water samples showing Ca concentrations ≤ 1.5 mg L−1, a threshold considered...
Authors
Gesa A. Weyhenmeyer, Jens Hartmann, Dag O. Hessen, Jiří Kopáček, Josef Hejzlar, Stephan Jacquet, Stephen K. Hamilton, Piet Verburg, Taylor H. Leach, Martin Schmid, Giovanna Flaim, Tiina Nõges, Peeter Nõges, Valerie C. Wentzky, Michela Rogora, James A. Rusak, Sarian Kosten, Andrew M. Paterson, Katrin Teubner, Scott N. Higgins, Gregory B. Lawrence, Külli Kangur, Ilga Kokorite, Leonardo Cerasino, Clara Funk, Rebecca G. Harvey, Florentina Moatar, Heleen de Wit, Thomas Zechmeister
Science and Products
Filter Total Items: 120
Regional target loads of atmospheric nitrogen and sulfur deposition for the protection of stream and watershed soil resources of the Adirondack Mountains, USA Regional target loads of atmospheric nitrogen and sulfur deposition for the protection of stream and watershed soil resources of the Adirondack Mountains, USA
Acidic deposition contributes to a range of environmental impacts across forested landscapes, including acidification of soil and drainage water, toxic aluminum mobilization, depletion of available soil nutrient cations, and impacts to forest and aquatic species health and biodiversity. In response to decreasing levels of acidic deposition, soils and drainage waters in some regions of...
Authors
Todd C. McDonnell, Charles T. Driscoll, Timothy J. Sullivan, Douglas A. Burns, Barry P. Baldigo, Shuai Shao, Gregory B. Lawrence
Changes in soil chemistry and foliar metabolism of Himalayan cedar (Cedrus deodara) and Himalayan spruce (Picea smithiana) along an elevational gradient at Kufri, HP, India: The potential roles of regional pollution and localized grazing Changes in soil chemistry and foliar metabolism of Himalayan cedar (Cedrus deodara) and Himalayan spruce (Picea smithiana) along an elevational gradient at Kufri, HP, India: The potential roles of regional pollution and localized grazing
We investigated changes in soil chemistry and foliar metabolism of Himalayan cedar [Cedrus deodara (Roxb. Ex Lamb.) G.Don] and Himalayan spruce [Picea smithiana (Wall.) Boiss] trees along a steep elevational gradient in the lower Himalayan Mountains at Kufri, Himachal Pradesh (HP), India. The foliar and soil samples were collected from four locations along a 300 m elevational gradient at...
Authors
Rakesh Minocha, Alexander R. Contosta, Gregory B. Lawrence, Ravinder K. Kohli, Subhash C. Minocha, Stephanie Long
Trends and current status of aluminum chemistry in Adirondack headwater streams 30 Years after the Clean Air Act Amendments of 1990 Trends and current status of aluminum chemistry in Adirondack headwater streams 30 Years after the Clean Air Act Amendments of 1990
Mobilization of toxic forms of aluminum (Ali) have been one of the most harmful effects of acidic deposition on aquatic ecosystems. Large decreases in acidic deposition levels have resulted in decreases in Ali concentrations in surface waters starting in the 1990s. However, recent studies indicate that fish communities are still being impaired by elevated Ali concentrations in streams...
Authors
Gregory B. Lawrence, Barry P. Baldigo, Karen M. Roy, Scott D. George
Have sustained acidic deposition decreases led to increased calcium availability in recovering watersheds of the Adirondack region of New York, USA? Have sustained acidic deposition decreases led to increased calcium availability in recovering watersheds of the Adirondack region of New York, USA?
Soil calcium depletion has been strongly linked to acidic deposition in eastern North America and recent studies have begun to document the recovery of soils in response to large decreases in acidic deposition. However, increased calcium availability has not yet been seen in the B horizon, where calcium depletion has been most acute, but mineral weathering is critically important for...
Authors
Gregory B. Lawrence, Jason Siemion, Michael R. Antidormi, Donald B. Bonville, Michael McHale
The response of streams to changes in atmospheric deposition of sulfur and nitrogen in the Adirondack Mountains The response of streams to changes in atmospheric deposition of sulfur and nitrogen in the Adirondack Mountains
Acidic deposition is the result of upwind sulfur (S) and nitrogen (N) emissions into the atmosphere from human activities. Environmental impacts from acidic deposition across forested landscapes include acidification of soil and drainage water, depletion of available soil nutrient bases, and impacts to and changes in forest and aquatic species composition and biodiversity. Acidic...
Authors
Charles T. Driscoll, Shuai Shao, Timothy J. Sullivan, Todd C. McDonnell, Barry P. Baldigo, Douglas A. Burns, Gregory B. Lawrence
Assessment of methods for soil monitoring in the Adirondack region of New York Assessment of methods for soil monitoring in the Adirondack region of New York
Repeated sampling to detect changes in forest soils was rarely used before 1990, but the value of soil monitoring in understanding environmental change is becoming well established. The growing number of resampling studies has shown that sampling designs and procedures must be adapted to the objectives of the monitoring program and the soils being monitored. In the Adirondack region...
Authors
Gregory B. Lawrence, Michael R. Antidormi
Reversal of forest soil acidification in the northeastern United States and eastern Canada: Site and soil factors contributing to recovery Reversal of forest soil acidification in the northeastern United States and eastern Canada: Site and soil factors contributing to recovery
As acidic deposition has decreased across Eastern North America, forest soils at some sites are beginning to show reversal of soil acidification. However, the degree of recovery appears to vary and is not fully explained by deposition declines alone. To assess if other site and soil factors can help to explain degree of recovery from acid deposition, soil resampling chemistry data (8- to...
Authors
P.W. Hazlett, C.E. Emilson, Gregory B. Lawrence, I. J. Fernandez, R. Ouimet, Scott Bailey
The response of stream ecosystems in the Adirondack region of New York to historical and future changes in atmospheric deposition of sulfur and nitrogen The response of stream ecosystems in the Adirondack region of New York to historical and future changes in atmospheric deposition of sulfur and nitrogen
The present-day acid-base chemistry of surface waters can be directly linked to contemporary observations of acid deposition; however, pre-industrial conditions are key to predicting the potential future recovery of stream ecosystems under decreasing loads of atmospheric sulfur (S) and nitrogen (N) deposition. The integrated biogeochemical model PnET-BGC was applied to 25 forest...
Authors
Shuai Shao, Charles T. Driscoll, Timothy J. Sullivan, Douglas A. Burns, Barry P. Baldigo, Gregory B. Lawrence, Todd C. McDonnell
Chronic and episodic acidification of streams along the Appalachian Trail corridor, eastern United States Chronic and episodic acidification of streams along the Appalachian Trail corridor, eastern United States
Acidic atmospheric deposition has adversely affected aquatic ecosystems globally. As emissions and deposition of sulfur (S) and nitrogen (N) have declined in recent decades across North America and Europe, ecosystem recovery is evident in many surface waters. However, persistent chronic and episodic acidification remain important concerns in vulnerable regions. We evaluated acidification...
Authors
Douglas A. Burns, Todd McDonnell, Karen C. Rice, Gregory B. Lawrence, Timothy Sullivan
Declining aluminum toxicity and the role of exposure duration on brook trout mortality in acidified streams of the Adirondack Mountains, New York, USA Declining aluminum toxicity and the role of exposure duration on brook trout mortality in acidified streams of the Adirondack Mountains, New York, USA
Mortality of brook trout Salvelinus fontinalis and water chemistry were characterized in 6 headwater streams in the western Adirondacks of New York during spring 2015, 2016, and 2017 and compared with results from analogous tests done between 1980 and 2003 in many of the same streams, to assess temporal changes in toxicity and inorganic monomeric aluminum (Ali) concentrations, and the...
Authors
Barry P. Baldigo, Scott George, Gregory B. Lawrence, Eric A. Paul
Recovery of soils from acidic deposition may exacerbate nitrogen export from forested watersheds Recovery of soils from acidic deposition may exacerbate nitrogen export from forested watersheds
Effects of ambient decreases in N deposition on forest N cycling remain unclear as soils recover from acidic deposition. To investigate, repeated soil sampling data were related to deposition, vegetation, and stream data, for 2000–2015 in North and South Buck Creek watersheds, in the Adirondack region of New York, USA. In 63 other Adirondack streams, NO3− concentrations were also...
Authors
Gregory B. Lawrence, Sara E. Scanga, Robert D. Sabo
Widespread diminishing anthropogenic effects on calcium in freshwaters Widespread diminishing anthropogenic effects on calcium in freshwaters
Calcium (Ca) is an essential element for almost all living organisms. Here, we examined global variation and controls of freshwater Ca concentrations, using 440 599 water samples from 43 184 inland water sites in 57 countries. We found that the global median Ca concentration was 4.0 mg L−1 with 20.7% of the water samples showing Ca concentrations ≤ 1.5 mg L−1, a threshold considered...
Authors
Gesa A. Weyhenmeyer, Jens Hartmann, Dag O. Hessen, Jiří Kopáček, Josef Hejzlar, Stephan Jacquet, Stephen K. Hamilton, Piet Verburg, Taylor H. Leach, Martin Schmid, Giovanna Flaim, Tiina Nõges, Peeter Nõges, Valerie C. Wentzky, Michela Rogora, James A. Rusak, Sarian Kosten, Andrew M. Paterson, Katrin Teubner, Scott N. Higgins, Gregory B. Lawrence, Külli Kangur, Ilga Kokorite, Leonardo Cerasino, Clara Funk, Rebecca G. Harvey, Florentina Moatar, Heleen de Wit, Thomas Zechmeister