Gregory B Lawrence (Former Employee)
Science and Products
Filter Total Items: 108
Impacts of acidification on macroinvertebrate communities in streams of the western Adirondack Mountains, New York, USA
Limited stream chemistry and macroinvertebrate data indicate that acidic deposition has adversely affected benthic macroinvertebrate assemblages in numerous headwater streams of the western Adirondack Mountains of New York. No studies, however, have quantified the effects that acidic deposition and acidification may have had on resident fish and macroinvertebrate communities in streams of the regi
Authors
Barry P. Baldigo, G. B. Lawrence, R.W. Bode, H. A. Simonin, K. M. Roy, A. J. Smith
A cross-site comparison of factors influencing soil nitrification rates in northeastern USA forested watersheds
Elevated N deposition is continuing on many forested landscapes around the world and our understanding of ecosystem response is incomplete. Soil processes, especially nitrification, are critical. Many studies of soil N transformations have focused on identifying relationships within a single watershed but these results are often not transferable. We studied 10 small forested research watersheds in
Authors
D.S. Ross, B.C. Wemple, A.E. Jamison, G. Fredriksen, J. B. Shanley, G. B. Lawrence, S.W. Bailey, J.L. Campbell
Climatically driven loss of calcium in steppe soil as a sink for atmospheric carbon
During the last several thousand years the semi-arid, cold climate of the Russian steppe formed highly fertile soils rich in organic carbon and calcium (classified as Chernozems in the Russian system). Analysis of archived soil samples collected in Kemannaya Steppe Preserve in 1920, 1947, 1970, and fresh samples collected in 1998 indicated that the native steppe Chernozems, however, lost 17-28 kg
Authors
A.G. Lapenis, G. B. Lawrence, S.W. Bailey, B.F. Aparin, A.I. Shiklomanov, N.A. Speranskaya, M.S. Torn, M. Calef
Chronic and episodic acidification of Adirondack streams from acid rain in 2003-2005
Limited information is available on streams in the Adirondack region of New York, although streams are more prone to acidification than the more studied Adirondack lakes. A stream assessment was therefore undertaken in the Oswegatchie and Black River drainages; an area of 4585 km2 in the western part of the Adirondack region. Acidification was evaluated with the newly developed base-cation surplus
Authors
G. B. Lawrence, K. M. Roy, Barry P. Baldigo, H. A. Simonin, S. B. Capone, J.W. Sutherland, S. A. Nierzwicki-Bauer, C.W. Boylen
Acid rain effects on aluminum mobilization clarified by inclusion of strong organic acids
Assessments of acidic deposition effects on aquatic ecosystems have often been hindered by complications from naturally occurring organic acidity. Measurements of pH and ANCG, the most commonly used indicators of chemical effects, can be substantially influenced by the presence of organic acids. Relationships between pH and inorganic Al, which is toxic to many forms of aquatic biota, are also alte
Authors
G. B. Lawrence, J.W. Sutherland, C.W. Boylen, S. W. Nierzwicki-Bauer, B. Momen, Barry P. Baldigo, H. A. Simonin
Factors controlling soil water and stream water aluminum concentrations after a clearcut in a forested watershed with calcium-poor soils
The 24 ha Dry Creek watershed in the Catskill Mountains of southeastern New York State USA was clearcut during the winter of 1996-1997. The interactions among acidity, nitrate (NO3- ), aluminum (Al), and calcium (Ca2+) in streamwater, soil water, and groundwater were evaluated to determine how they affected the speciation, solubility, and concentrations of Al after the harvest. Watershed soils wer
Authors
M.R. McHale, Douglas A. Burns, G. B. Lawrence, Peter S. Murdoch
Workshop establishes the northeastern soil monitoring cooperative
[No abstract available]
Authors
G. B. Lawrence, S.W. Bailey
Quality-Assurance Data for Routine Water Analyses by the U.S. Geological Survey Laboratory in Troy, New York-July 1997 through June 1999
The laboratory for analysis of low-ionic-strength water at the U.S. Geological Survey (USGS) Water Science Center in Troy, N.Y., analyzes samples collected by USGS projects throughout the Northeast. The laboratory's quality-assurance program is based on internal and interlaboratory quality-assurance samples and quality-control procedures that were developed to ensure proper sample collection, proc
Authors
Tricia A. Lincoln, Debra A. Horan-Ross, Michael R. McHale, Gregory B. Lawrence
One-day rate measurements for estimating net nitrification potential in humid forest soils
Measurements of net nitrification rates in forest soils have usually been performed by extended sample incubation (2-8 weeks), either in the field or in the lab. Because of disturbance effects, these measurements are only estimates of nitrification potential and shorter incubations may suffice. In three separate studies of northeastern USA forest soil surface horizons, we found that laboratory nit
Authors
D.S. Ross, G. Fredriksen, A.E. Jamison, B.C. Wemple, S.W. Bailey, J. B. Shanley, G. B. Lawrence
Trends in summer chemistry linked to productivity in lakes recovering from acid deposition in the Adirondack region of New York
The US Environmental Protection Agency established the Adirondack Effects Assessment Program (AEAP) to evaluate and monitor the status of biological communities in lakes in the Adirondack region of New York that have been adversely affected by acid deposition. This program includes chemical analysis of 30 lakes, sampled two to three times each summer. Results of trends analysis for lake chemistry
Authors
B. Momen, G. B. Lawrence, S. A. Nierzwicki-Bauer, J.W. Sutherland, L.W. Eichler, J.P. Harrison, C.W. Boylen
Diatom diversity in chronically versus episodically acidified adirondack streams
The relationship between algal species richness and diversity, and pH is controversial. Furthermore, it is still unknown how episodic stream acidification following atmospheric deposition affects species richness and diversity. Here we analyzed water chemistry and diatom epiphyton dynamics and showed their contrasting behavior in chronically vs. episodically acidic streams in the Adirondack region
Authors
S.I. Passy, I. Ciugulea, G. B. Lawrence
Quality-Assurance Data for Routine Water Analyses by the U.S. Geological Survey Laboratory in Troy, New York--July 1999 through June 2001
The laboratory for analysis of low-ionic-strength water at the U.S. Geological Survey (USGS) Water Science Center in Troy, N.Y., analyzes samples collected by USGS projects throughout the Northeast. The laboratory's quality-assurance program is based on internal and interlaboratory quality-assurance samples and quality-control procedures that were developed to ensure proper sample collection, proc
Authors
Tricia A. Lincoln, Debra A. Horan-Ross, Michael R. McHale, Gregory B. Lawrence
Science and Products
Filter Total Items: 108
Impacts of acidification on macroinvertebrate communities in streams of the western Adirondack Mountains, New York, USA
Limited stream chemistry and macroinvertebrate data indicate that acidic deposition has adversely affected benthic macroinvertebrate assemblages in numerous headwater streams of the western Adirondack Mountains of New York. No studies, however, have quantified the effects that acidic deposition and acidification may have had on resident fish and macroinvertebrate communities in streams of the regi
Authors
Barry P. Baldigo, G. B. Lawrence, R.W. Bode, H. A. Simonin, K. M. Roy, A. J. Smith
A cross-site comparison of factors influencing soil nitrification rates in northeastern USA forested watersheds
Elevated N deposition is continuing on many forested landscapes around the world and our understanding of ecosystem response is incomplete. Soil processes, especially nitrification, are critical. Many studies of soil N transformations have focused on identifying relationships within a single watershed but these results are often not transferable. We studied 10 small forested research watersheds in
Authors
D.S. Ross, B.C. Wemple, A.E. Jamison, G. Fredriksen, J. B. Shanley, G. B. Lawrence, S.W. Bailey, J.L. Campbell
Climatically driven loss of calcium in steppe soil as a sink for atmospheric carbon
During the last several thousand years the semi-arid, cold climate of the Russian steppe formed highly fertile soils rich in organic carbon and calcium (classified as Chernozems in the Russian system). Analysis of archived soil samples collected in Kemannaya Steppe Preserve in 1920, 1947, 1970, and fresh samples collected in 1998 indicated that the native steppe Chernozems, however, lost 17-28 kg
Authors
A.G. Lapenis, G. B. Lawrence, S.W. Bailey, B.F. Aparin, A.I. Shiklomanov, N.A. Speranskaya, M.S. Torn, M. Calef
Chronic and episodic acidification of Adirondack streams from acid rain in 2003-2005
Limited information is available on streams in the Adirondack region of New York, although streams are more prone to acidification than the more studied Adirondack lakes. A stream assessment was therefore undertaken in the Oswegatchie and Black River drainages; an area of 4585 km2 in the western part of the Adirondack region. Acidification was evaluated with the newly developed base-cation surplus
Authors
G. B. Lawrence, K. M. Roy, Barry P. Baldigo, H. A. Simonin, S. B. Capone, J.W. Sutherland, S. A. Nierzwicki-Bauer, C.W. Boylen
Acid rain effects on aluminum mobilization clarified by inclusion of strong organic acids
Assessments of acidic deposition effects on aquatic ecosystems have often been hindered by complications from naturally occurring organic acidity. Measurements of pH and ANCG, the most commonly used indicators of chemical effects, can be substantially influenced by the presence of organic acids. Relationships between pH and inorganic Al, which is toxic to many forms of aquatic biota, are also alte
Authors
G. B. Lawrence, J.W. Sutherland, C.W. Boylen, S. W. Nierzwicki-Bauer, B. Momen, Barry P. Baldigo, H. A. Simonin
Factors controlling soil water and stream water aluminum concentrations after a clearcut in a forested watershed with calcium-poor soils
The 24 ha Dry Creek watershed in the Catskill Mountains of southeastern New York State USA was clearcut during the winter of 1996-1997. The interactions among acidity, nitrate (NO3- ), aluminum (Al), and calcium (Ca2+) in streamwater, soil water, and groundwater were evaluated to determine how they affected the speciation, solubility, and concentrations of Al after the harvest. Watershed soils wer
Authors
M.R. McHale, Douglas A. Burns, G. B. Lawrence, Peter S. Murdoch
Workshop establishes the northeastern soil monitoring cooperative
[No abstract available]
Authors
G. B. Lawrence, S.W. Bailey
Quality-Assurance Data for Routine Water Analyses by the U.S. Geological Survey Laboratory in Troy, New York-July 1997 through June 1999
The laboratory for analysis of low-ionic-strength water at the U.S. Geological Survey (USGS) Water Science Center in Troy, N.Y., analyzes samples collected by USGS projects throughout the Northeast. The laboratory's quality-assurance program is based on internal and interlaboratory quality-assurance samples and quality-control procedures that were developed to ensure proper sample collection, proc
Authors
Tricia A. Lincoln, Debra A. Horan-Ross, Michael R. McHale, Gregory B. Lawrence
One-day rate measurements for estimating net nitrification potential in humid forest soils
Measurements of net nitrification rates in forest soils have usually been performed by extended sample incubation (2-8 weeks), either in the field or in the lab. Because of disturbance effects, these measurements are only estimates of nitrification potential and shorter incubations may suffice. In three separate studies of northeastern USA forest soil surface horizons, we found that laboratory nit
Authors
D.S. Ross, G. Fredriksen, A.E. Jamison, B.C. Wemple, S.W. Bailey, J. B. Shanley, G. B. Lawrence
Trends in summer chemistry linked to productivity in lakes recovering from acid deposition in the Adirondack region of New York
The US Environmental Protection Agency established the Adirondack Effects Assessment Program (AEAP) to evaluate and monitor the status of biological communities in lakes in the Adirondack region of New York that have been adversely affected by acid deposition. This program includes chemical analysis of 30 lakes, sampled two to three times each summer. Results of trends analysis for lake chemistry
Authors
B. Momen, G. B. Lawrence, S. A. Nierzwicki-Bauer, J.W. Sutherland, L.W. Eichler, J.P. Harrison, C.W. Boylen
Diatom diversity in chronically versus episodically acidified adirondack streams
The relationship between algal species richness and diversity, and pH is controversial. Furthermore, it is still unknown how episodic stream acidification following atmospheric deposition affects species richness and diversity. Here we analyzed water chemistry and diatom epiphyton dynamics and showed their contrasting behavior in chronically vs. episodically acidic streams in the Adirondack region
Authors
S.I. Passy, I. Ciugulea, G. B. Lawrence
Quality-Assurance Data for Routine Water Analyses by the U.S. Geological Survey Laboratory in Troy, New York--July 1999 through June 2001
The laboratory for analysis of low-ionic-strength water at the U.S. Geological Survey (USGS) Water Science Center in Troy, N.Y., analyzes samples collected by USGS projects throughout the Northeast. The laboratory's quality-assurance program is based on internal and interlaboratory quality-assurance samples and quality-control procedures that were developed to ensure proper sample collection, proc
Authors
Tricia A. Lincoln, Debra A. Horan-Ross, Michael R. McHale, Gregory B. Lawrence