Gregory B Lawrence (Former Employee)
Science and Products
Filter Total Items: 109
Effect of chronic nitrogen additions on soil nitrogen fractions in red spruce stands Effect of chronic nitrogen additions on soil nitrogen fractions in red spruce stands
The responses of temperate and boreal forest ecosystems to increased nitrogen (N) inputs have been varied, and the responses of soil N pools have been difficult to measure. In this study, fractions and pool sizes of N were determined in the forest floor of red spruce stands at four sites in the northeastern U.S. to evaluate the effect of increased N inputs on forest floor N. Two of the...
Authors
M.B. David, A.M. Cupples, G.B. Lawrence, G. Shi, K. Vogt, P.M. Wargo
Relation of climate change to the acidification of surface waters by nitrogen deposition Relation of climate change to the acidification of surface waters by nitrogen deposition
Abrupt increases and decreases in mean seasonal and annual stream NO3- concentrations during the period of record (1983-1995) at Biscuit Brook, a headwater stream in the Catskill Mountains of New York, have provided an opportunity to study the biogeochemical processes that control NO3- movement through forested watersheds. The Catskills receive the highest rate of NO3- deposition in the...
Authors
Peter S. Murdoch, Douglas A. Burns, G.B. Lawrence
Streams in catskill mountains still susceptible to acid rain Streams in catskill mountains still susceptible to acid rain
[No abstract available]
Authors
Douglas A. Burns, G.B. Lawrence, Peter S. Murdoch
Effect of groundwater springs on NO3− concentrations during summer in Catskill Mountain streams Effect of groundwater springs on NO3− concentrations during summer in Catskill Mountain streams
Groundwater and stream water data collected at three headwater catchments in the Neversink River watershed indicate that base flow is sustained by groundwater from two sources: a shallow flow system within the till and soil and a deep flow system within bedrock fractures and bedding planes that discharges as perennial springs. Data from eight wells finished near the till/bedrock...
Authors
Douglas A. Burns, Peter S. Murdoch, Gregory B. Lawrence, Robert L. Michel
Combining digital spatial data with hydrologic measurements to interpret controls of stream chemistry in large watersheds Combining digital spatial data with hydrologic measurements to interpret controls of stream chemistry in large watersheds
No abstract available.
Authors
Yvonne H. Baevsky, Gregory B. Lawrence, David M. Wolock, Douglas A. Burns, Peter S. Murdoch
Acidic deposition, cation mobilization, and biochemical indicators of stress in healthy red spruce 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
W.C. Shortle, K.T. Smith, R. Minocha, G.B. Lawrence, M.B. David
Science and Products
Filter Total Items: 109
Effect of chronic nitrogen additions on soil nitrogen fractions in red spruce stands Effect of chronic nitrogen additions on soil nitrogen fractions in red spruce stands
The responses of temperate and boreal forest ecosystems to increased nitrogen (N) inputs have been varied, and the responses of soil N pools have been difficult to measure. In this study, fractions and pool sizes of N were determined in the forest floor of red spruce stands at four sites in the northeastern U.S. to evaluate the effect of increased N inputs on forest floor N. Two of the...
Authors
M.B. David, A.M. Cupples, G.B. Lawrence, G. Shi, K. Vogt, P.M. Wargo
Relation of climate change to the acidification of surface waters by nitrogen deposition Relation of climate change to the acidification of surface waters by nitrogen deposition
Abrupt increases and decreases in mean seasonal and annual stream NO3- concentrations during the period of record (1983-1995) at Biscuit Brook, a headwater stream in the Catskill Mountains of New York, have provided an opportunity to study the biogeochemical processes that control NO3- movement through forested watersheds. The Catskills receive the highest rate of NO3- deposition in the...
Authors
Peter S. Murdoch, Douglas A. Burns, G.B. Lawrence
Streams in catskill mountains still susceptible to acid rain Streams in catskill mountains still susceptible to acid rain
[No abstract available]
Authors
Douglas A. Burns, G.B. Lawrence, Peter S. Murdoch
Effect of groundwater springs on NO3− concentrations during summer in Catskill Mountain streams Effect of groundwater springs on NO3− concentrations during summer in Catskill Mountain streams
Groundwater and stream water data collected at three headwater catchments in the Neversink River watershed indicate that base flow is sustained by groundwater from two sources: a shallow flow system within the till and soil and a deep flow system within bedrock fractures and bedding planes that discharges as perennial springs. Data from eight wells finished near the till/bedrock...
Authors
Douglas A. Burns, Peter S. Murdoch, Gregory B. Lawrence, Robert L. Michel
Combining digital spatial data with hydrologic measurements to interpret controls of stream chemistry in large watersheds Combining digital spatial data with hydrologic measurements to interpret controls of stream chemistry in large watersheds
No abstract available.
Authors
Yvonne H. Baevsky, Gregory B. Lawrence, David M. Wolock, Douglas A. Burns, Peter S. Murdoch
Acidic deposition, cation mobilization, and biochemical indicators of stress in healthy red spruce 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
W.C. Shortle, K.T. Smith, R. Minocha, G.B. Lawrence, M.B. David