Gregory B Lawrence (Former Employee)
Science and Products
Filter Total Items: 108
Acidic deposition, cation mobilization, and biochemical indicators of stress in healthy red spruce
Dendrochemical and biochemical markers link stress in apparently healthy red spruce trees (Picea rubens) to acidic deposition. Acidic deposition to spruce forests of the northeastern USA increased sharply during the 1960s. Previous reports related visible damage of trees at high elevations to root and soil processes. In this report, dendrochemical and foliar biochemical markers indicate...
Authors
Walter C. Shortle, K.T. Smith, R. Minocha, Gregory Lawrence, M.B. David
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
Gregory Lawrence, M.B. David, S.W. Bailey, Walter C. Shortle
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, Walter C. Shortle, Gregory Lawrence, M.B. David, S.C. Minocha
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, Debra A. Horan-Ross, M.L. Olson, Gregory Lawrence
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, Gregory Lawrence
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
Gregory Lawrence, M.B. David
Science and Products
Filter Total Items: 108
Acidic deposition, cation mobilization, and biochemical indicators of stress in healthy red spruce
Dendrochemical and biochemical markers link stress in apparently healthy red spruce trees (Picea rubens) to acidic deposition. Acidic deposition to spruce forests of the northeastern USA increased sharply during the 1960s. Previous reports related visible damage of trees at high elevations to root and soil processes. In this report, dendrochemical and foliar biochemical markers indicate...
Authors
Walter C. Shortle, K.T. Smith, R. Minocha, Gregory Lawrence, M.B. David
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
Gregory Lawrence, M.B. David, S.W. Bailey, Walter C. Shortle
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, Walter C. Shortle, Gregory Lawrence, M.B. David, S.C. Minocha
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, Debra A. Horan-Ross, M.L. Olson, Gregory Lawrence
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, Gregory Lawrence
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
Gregory Lawrence, M.B. David