Gregory B Lawrence (Former Employee)
Science and Products
Filter Total Items: 109
Effects of basin size on low-flow stream chemistry and subsurface contact time in the neversink river watershed, New York Effects of basin size on low-flow stream chemistry and subsurface contact time in the neversink river watershed, New York
The effects of basin size on low-flow stream chemistry and subsurface contact time were examined for a part of the Neversink River watershed in southern New York State. Acid neutralizing capacity (ANC), the sum of base cation concentrations (SBC), pH and concentrations of total aluminum (Al), dissolved organic carbon (DOC) and silicon (Si) were measured during low stream flow at the...
Authors
D.M. Wolock, J. Fan, G.B. Lawrence
Response of aluminum solubility to elevated nitrification in soil of a red spruce stand in eastern Maine Response of aluminum solubility to elevated nitrification in soil of a red spruce stand in eastern Maine
Elevated concentrations of soluble Al can impair tree growth and be toxic to aquatic biota, but effects of acidic deposition on Al solubility in forest soils are only partially understood because of complex interactions with H+ and organic matter. We therefore evaluated Al solubility in two red spruce stands in eastern Maine, one of which received dry (NH4)2SO4 at a rate of 1800 equiv ha...
Authors
G.B. Lawrence, M.B. David
Assessment of soil calcium status in red spruce forests in the northeastern United States Assessment of soil calcium status in red spruce forests in the northeastern United States
Long-term changes in concentrations of available Ca in soils of red spruce forests have been documented, but remaining questions about the magnitude and regional extent of these changes have precluded an assessment of the current and future status of soil Ca. To address this problem, soil samples were collected in 1992-93 from 12 sites in New York, Vermont, New Hampshire, and Maine to...
Authors
G.B. Lawrence, M.B. David, S.W. Bailey, W.C. Shortle
Relationships among foliar chemistry, foliar polyamines, and soil chemistry in red spruce trees growing across the northeastern United States Relationships among foliar chemistry, foliar polyamines, and soil chemistry in red spruce trees growing across the northeastern United States
Forest trees are constantly exposed to various types of natural and anthropogenic stressors. A major long-term goal of our research is to develop a set of early physiological and biochemical markers of stress in trees before the appearance of visual symptoms. Six red spruce (Picea rubens Sarg.) stands from the northeastern United States were selected for collection of soil and foliage...
Authors
R. Minocha, W.C. Shortle, G.B. Lawrence, M.B. David, S.C. Minocha
Exchangeable hydrogen explains the pH of spodosol Oa horizons Exchangeable hydrogen explains the pH of spodosol Oa horizons
The chemistry of extremely acid Oa horizons does not conform to traditional pH, Al, and base saturation relationships. Results from two separate studies of northeastern U.S. forested soils were used to investigate relationships between pH in water or dilute salt solutions and other soil characteristics. In Oa horizons with pH below 4, soil pH in dilute CaCl2 solution was correlated with
Authors
D.S. Ross, R. J. Bartlett, M.B. David, G.B. Lawrence
Chemical evaluation of soil-solution in acid forest soils Chemical evaluation of soil-solution in acid forest soils
Soil-solution chemistry is commonly studied in forests through the use of soil lysimeters.This approach is impractical for regional survey studies, however, because lysimeter installation and operation is expensive and time consuming. To address these problems, a new technique was developed to compare soil-solution chemistry among red spruce stands in New York, Vermont, New Hampshire...
Authors
G.B. Lawrence, Mark B. David
Quality-assurance data for routine water analyses by the U.S. Geological Survey Laboratory in Troy, New York, May 1991 through June 1993 Quality-assurance data for routine water analyses by the U.S. Geological Survey Laboratory in Troy, New York, May 1991 through June 1993
No abstract available.
Authors
T.A. Lincoln, D. A. Horan-Ross, M.L. Olson, G.B. Lawrence
Soil and soil solution chemistry under red spruce stands across the northeastern united states Soil and soil solution chemistry under red spruce stands across the northeastern united states
Red spruce ecosystems in the northeastern United States are of interest because this species is undergoing regional decline. Their underlying soils have been examined closely at only a few sites, and information available on red spruce soils throughout this region is limited.This study was conducted to examine soil and soil solution chemistry at red spruce sites in the northeastern US...
Authors
M.B. David, G.B. Lawrence
A new mechanism for calcium loss in forest-floor soils A new mechanism for calcium loss in forest-floor soils
Calcium is the fifth most abundant element in trees, and is an essential component for wood formation and the maintenance of cell walls. Depletion of Ca from the rooting zone can result in acidification of soil1 and surface water2 and possibly growth decline and dieback of red spruce3,4. During the past six decades, concentrations of root-available Ca (exchangeable and acid-extractable...
Authors
G.B. Lawrence, M.B. David, W.C. Shortle
Soil-solution chemistry in a low-elevation spruce-fir ecosystem, Howland, Maine Soil-solution chemistry in a low-elevation spruce-fir ecosystem, Howland, Maine
Soil solutions were collected monthly by tension and zero-tension lysimeters in a low-elevation red spruce stand in east-central Maine from May 1987 through December 1992. Soil solutions collected by Oa tension lysimeters had higher concentrations of most constituents than the Oa zero-tension lysimeters. In Oa horizon soil solutions growing season concentrations for SO4, Ca, and Mg...
Authors
Ivan J. Fernandez, Gregory B. Lawrence, Yowhan Son
Analytical methods of the U.S. Geological Survey's New York District Water-Analysis Laboratory Analytical methods of the U.S. Geological Survey's New York District Water-Analysis Laboratory
The New York District of the U.S. Geological Survey (USGS) in Troy, N.Y., operates a water-analysis laboratory for USGS watershed-research projects in the Northeast that require analyses of precipitation and of dilute surface water and soil water for major ions; it also provides analyses of certain chemical constituents in soils and soil gas samples. This report presents the methods for...
Authors
Gregory B. Lawrence, Tricia A. Lincoln, Debra A. Horan-Ross, Mark L. Olson, Laura A. Waldron
Work plan of the Neversink watershed study in the Catskill Mountains of southeastern New York Work plan of the Neversink watershed study in the Catskill Mountains of southeastern New York
No abstract available.
Authors
Gregory B. Lawrence, Douglas A. Burns, Peter S. Murdoch, Barry P. Baldigo, Y. H. Baevsky
Science and Products
Filter Total Items: 109
Effects of basin size on low-flow stream chemistry and subsurface contact time in the neversink river watershed, New York Effects of basin size on low-flow stream chemistry and subsurface contact time in the neversink river watershed, New York
The effects of basin size on low-flow stream chemistry and subsurface contact time were examined for a part of the Neversink River watershed in southern New York State. Acid neutralizing capacity (ANC), the sum of base cation concentrations (SBC), pH and concentrations of total aluminum (Al), dissolved organic carbon (DOC) and silicon (Si) were measured during low stream flow at the...
Authors
D.M. Wolock, J. Fan, G.B. Lawrence
Response of aluminum solubility to elevated nitrification in soil of a red spruce stand in eastern Maine Response of aluminum solubility to elevated nitrification in soil of a red spruce stand in eastern Maine
Elevated concentrations of soluble Al can impair tree growth and be toxic to aquatic biota, but effects of acidic deposition on Al solubility in forest soils are only partially understood because of complex interactions with H+ and organic matter. We therefore evaluated Al solubility in two red spruce stands in eastern Maine, one of which received dry (NH4)2SO4 at a rate of 1800 equiv ha...
Authors
G.B. Lawrence, M.B. David
Assessment of soil calcium status in red spruce forests in the northeastern United States Assessment of soil calcium status in red spruce forests in the northeastern United States
Long-term changes in concentrations of available Ca in soils of red spruce forests have been documented, but remaining questions about the magnitude and regional extent of these changes have precluded an assessment of the current and future status of soil Ca. To address this problem, soil samples were collected in 1992-93 from 12 sites in New York, Vermont, New Hampshire, and Maine to...
Authors
G.B. Lawrence, M.B. David, S.W. Bailey, W.C. Shortle
Relationships among foliar chemistry, foliar polyamines, and soil chemistry in red spruce trees growing across the northeastern United States Relationships among foliar chemistry, foliar polyamines, and soil chemistry in red spruce trees growing across the northeastern United States
Forest trees are constantly exposed to various types of natural and anthropogenic stressors. A major long-term goal of our research is to develop a set of early physiological and biochemical markers of stress in trees before the appearance of visual symptoms. Six red spruce (Picea rubens Sarg.) stands from the northeastern United States were selected for collection of soil and foliage...
Authors
R. Minocha, W.C. Shortle, G.B. Lawrence, M.B. David, S.C. Minocha
Exchangeable hydrogen explains the pH of spodosol Oa horizons Exchangeable hydrogen explains the pH of spodosol Oa horizons
The chemistry of extremely acid Oa horizons does not conform to traditional pH, Al, and base saturation relationships. Results from two separate studies of northeastern U.S. forested soils were used to investigate relationships between pH in water or dilute salt solutions and other soil characteristics. In Oa horizons with pH below 4, soil pH in dilute CaCl2 solution was correlated with
Authors
D.S. Ross, R. J. Bartlett, M.B. David, G.B. Lawrence
Chemical evaluation of soil-solution in acid forest soils Chemical evaluation of soil-solution in acid forest soils
Soil-solution chemistry is commonly studied in forests through the use of soil lysimeters.This approach is impractical for regional survey studies, however, because lysimeter installation and operation is expensive and time consuming. To address these problems, a new technique was developed to compare soil-solution chemistry among red spruce stands in New York, Vermont, New Hampshire...
Authors
G.B. Lawrence, Mark B. David
Quality-assurance data for routine water analyses by the U.S. Geological Survey Laboratory in Troy, New York, May 1991 through June 1993 Quality-assurance data for routine water analyses by the U.S. Geological Survey Laboratory in Troy, New York, May 1991 through June 1993
No abstract available.
Authors
T.A. Lincoln, D. A. Horan-Ross, M.L. Olson, G.B. Lawrence
Soil and soil solution chemistry under red spruce stands across the northeastern united states Soil and soil solution chemistry under red spruce stands across the northeastern united states
Red spruce ecosystems in the northeastern United States are of interest because this species is undergoing regional decline. Their underlying soils have been examined closely at only a few sites, and information available on red spruce soils throughout this region is limited.This study was conducted to examine soil and soil solution chemistry at red spruce sites in the northeastern US...
Authors
M.B. David, G.B. Lawrence
A new mechanism for calcium loss in forest-floor soils A new mechanism for calcium loss in forest-floor soils
Calcium is the fifth most abundant element in trees, and is an essential component for wood formation and the maintenance of cell walls. Depletion of Ca from the rooting zone can result in acidification of soil1 and surface water2 and possibly growth decline and dieback of red spruce3,4. During the past six decades, concentrations of root-available Ca (exchangeable and acid-extractable...
Authors
G.B. Lawrence, M.B. David, W.C. Shortle
Soil-solution chemistry in a low-elevation spruce-fir ecosystem, Howland, Maine Soil-solution chemistry in a low-elevation spruce-fir ecosystem, Howland, Maine
Soil solutions were collected monthly by tension and zero-tension lysimeters in a low-elevation red spruce stand in east-central Maine from May 1987 through December 1992. Soil solutions collected by Oa tension lysimeters had higher concentrations of most constituents than the Oa zero-tension lysimeters. In Oa horizon soil solutions growing season concentrations for SO4, Ca, and Mg...
Authors
Ivan J. Fernandez, Gregory B. Lawrence, Yowhan Son
Analytical methods of the U.S. Geological Survey's New York District Water-Analysis Laboratory Analytical methods of the U.S. Geological Survey's New York District Water-Analysis Laboratory
The New York District of the U.S. Geological Survey (USGS) in Troy, N.Y., operates a water-analysis laboratory for USGS watershed-research projects in the Northeast that require analyses of precipitation and of dilute surface water and soil water for major ions; it also provides analyses of certain chemical constituents in soils and soil gas samples. This report presents the methods for...
Authors
Gregory B. Lawrence, Tricia A. Lincoln, Debra A. Horan-Ross, Mark L. Olson, Laura A. Waldron
Work plan of the Neversink watershed study in the Catskill Mountains of southeastern New York Work plan of the Neversink watershed study in the Catskill Mountains of southeastern New York
No abstract available.
Authors
Gregory B. Lawrence, Douglas A. Burns, Peter S. Murdoch, Barry P. Baldigo, Y. H. Baevsky