Gregory B Lawrence (Former Employee)
Science and Products
Filter Total Items: 110
Atmospheric deposition and watershed nitrogen export along an elevational gradient in the Catskill Mountains, New York Atmospheric deposition and watershed nitrogen export along an elevational gradient in the Catskill Mountains, New York
Cumulative effects of atmospheric N deposition may increase N export from watersheds and contribute to the acidification of surface waters, but natural factors (such as forest productivity and soil drainage) that affect forest N cycling can also control watershed N export. To identify factors that are related to stream-water export of N, elevational gradients in atmospheric deposition...
Authors
G.B. Lawrence, Gary M. Lovett, Y. H. Baevsky
Forest soil chemistry and terrain attributes in a Catskills watershed Forest soil chemistry and terrain attributes in a Catskills watershed
Knowledge of soil chemistry is useful in assessing the sensitivity of forested areas to natural and anthropogenic disturbances, but characterizing large areas is expensive because of the large sample numbers required and the cost of soil chemical analyses. We collected and chemically analyzed soil samples from 72 sites within a 214-ha watershed in the Catskill Mountains of New York to...
Authors
C.E. Johnson, J. J. Ruiz-Mendez, G.B. Lawrence
Composition of fish communities in relation to stream acidification and habitat in the Neversink River, New York Composition of fish communities in relation to stream acidification and habitat in the Neversink River, New York
The effects of acidification in lotic systems are not well documented. Spatial and temporal variability of habitat and water quality complicate the evaluation of acidification effects in streams and rivers. The Neversink River in the Catskill Mountains of southeastern New York, the tributaries of which vary from well buffered to severely acidified, provided an opportunity to investigate...
Authors
Barry P. Baldigo, G.B. Lawrence
Atmospheric nitrogen in the Mississippi River Basin: Amissions, deposition and transport Atmospheric nitrogen in the Mississippi River Basin: Amissions, deposition and transport
Atmospheric deposition of nitrogen has been cited as a major factor in the nitrogen saturation of forests in the north-eastern United States and as a contributor to the eutrophication of coastal waters, including the Gulf of Mexico near the mouth of the Mississippi River. Sources of nitrogen emissions and the resulting spatial patterns of nitrogen deposition within the Mississippi River...
Authors
G.B. Lawrence, D. A. Goolsby, W.A. Battaglin, G.J. Stensland
Soil calcium status and the response of stream chemistry to changing acidic deposition rates Soil calcium status and the response of stream chemistry to changing acidic deposition rates
Despite a decreasing trend in acidic deposition rates over the past two to three decades, acidified surface waters in the northeastern United States have shown minimal changes. Depletion of soil Ca pools has been suggested as a cause, although changes in soil Ca pools have not been directly related to long-term records of stream chemistry. To investigate this problem, a comprehensive...
Authors
G.B. Lawrence, Mark B. David, Gary M. Lovett, Peter S. Murdoch, Douglas A. Burns, John L. Stoddard, Barry P. Baldigo, J.H. Porter, A.W. Thompson
Soil-calcium depletion linked to acid rain and forest growth in the eastern United States Soil-calcium depletion linked to acid rain and forest growth in the eastern United States
Since the discovery of acid rain in the 1970's, scientists have been concerned that deposition of acids could cause depletion of calcium in forest soils. Research in the 1980's showed that the amount of calcium in forest soils is controlled by several factors that are difficult to measure. Further research in the 1990's, including several studies by the U.S. Geological Survey, has shown...
Authors
Gregory B. Lawrence, T.G. Huntington
Science and Products
Filter Total Items: 110
Atmospheric deposition and watershed nitrogen export along an elevational gradient in the Catskill Mountains, New York Atmospheric deposition and watershed nitrogen export along an elevational gradient in the Catskill Mountains, New York
Cumulative effects of atmospheric N deposition may increase N export from watersheds and contribute to the acidification of surface waters, but natural factors (such as forest productivity and soil drainage) that affect forest N cycling can also control watershed N export. To identify factors that are related to stream-water export of N, elevational gradients in atmospheric deposition...
Authors
G.B. Lawrence, Gary M. Lovett, Y. H. Baevsky
Forest soil chemistry and terrain attributes in a Catskills watershed Forest soil chemistry and terrain attributes in a Catskills watershed
Knowledge of soil chemistry is useful in assessing the sensitivity of forested areas to natural and anthropogenic disturbances, but characterizing large areas is expensive because of the large sample numbers required and the cost of soil chemical analyses. We collected and chemically analyzed soil samples from 72 sites within a 214-ha watershed in the Catskill Mountains of New York to...
Authors
C.E. Johnson, J. J. Ruiz-Mendez, G.B. Lawrence
Composition of fish communities in relation to stream acidification and habitat in the Neversink River, New York Composition of fish communities in relation to stream acidification and habitat in the Neversink River, New York
The effects of acidification in lotic systems are not well documented. Spatial and temporal variability of habitat and water quality complicate the evaluation of acidification effects in streams and rivers. The Neversink River in the Catskill Mountains of southeastern New York, the tributaries of which vary from well buffered to severely acidified, provided an opportunity to investigate...
Authors
Barry P. Baldigo, G.B. Lawrence
Atmospheric nitrogen in the Mississippi River Basin: Amissions, deposition and transport Atmospheric nitrogen in the Mississippi River Basin: Amissions, deposition and transport
Atmospheric deposition of nitrogen has been cited as a major factor in the nitrogen saturation of forests in the north-eastern United States and as a contributor to the eutrophication of coastal waters, including the Gulf of Mexico near the mouth of the Mississippi River. Sources of nitrogen emissions and the resulting spatial patterns of nitrogen deposition within the Mississippi River...
Authors
G.B. Lawrence, D. A. Goolsby, W.A. Battaglin, G.J. Stensland
Soil calcium status and the response of stream chemistry to changing acidic deposition rates Soil calcium status and the response of stream chemistry to changing acidic deposition rates
Despite a decreasing trend in acidic deposition rates over the past two to three decades, acidified surface waters in the northeastern United States have shown minimal changes. Depletion of soil Ca pools has been suggested as a cause, although changes in soil Ca pools have not been directly related to long-term records of stream chemistry. To investigate this problem, a comprehensive...
Authors
G.B. Lawrence, Mark B. David, Gary M. Lovett, Peter S. Murdoch, Douglas A. Burns, John L. Stoddard, Barry P. Baldigo, J.H. Porter, A.W. Thompson
Soil-calcium depletion linked to acid rain and forest growth in the eastern United States Soil-calcium depletion linked to acid rain and forest growth in the eastern United States
Since the discovery of acid rain in the 1970's, scientists have been concerned that deposition of acids could cause depletion of calcium in forest soils. Research in the 1980's showed that the amount of calcium in forest soils is controlled by several factors that are difficult to measure. Further research in the 1990's, including several studies by the U.S. Geological Survey, has shown...
Authors
Gregory B. Lawrence, T.G. Huntington