Journal ArticleDOI
Long-term trends in the chemistry of precipitation and lake water in the Adirondack Region of New York, USA
TLDR
In this paper, the long-term changes in the chemistry of precipitation in the Adirondack region of New York, USA were investigated, and time-series analysis showed that concentrations of SO4�2−, NO3−, NH4+ and basic cations have decreased in precipitation, resulting in increases in pH.Abstract:
Long-term changes in the chemistry of precipitation (1978–94) and 16 lakes (1982–94) were investigated in the Adirondack region of New York, USA. Time-series analysis showed that concentrations of SO4
2−, NO3
−, NH4
+ and basic cations have decreased in precipitation, resulting in increases in pH. A relatively uniform rate of decline in SO4
2− concentrations in lakes across the region (1.81±0.35 μeq L−1 yr−1) suggests that this change was due to decreases in atmospheric deposition. The decrease in lake SO4
2− was considerably less than the rate of decline anticipated from atmospheric deposition. This discrepancy may be due to release of previously deposited SO4
2− from soil, thereby delaying the recovery of lake water acidity. Despite the marked declines in concentrations of SO4
2− in Adirondack lakes, there has been no systematic increase in pH and ANC. The decline in SO4
2− has corresponded with a near stoichiometric decrease in concentrations of basic cations in low ANC lakes. A pattern of increasing NO3
− concentrations that was evident in lakes across the region during the 1980's has been followed by a period of lower concentrations. Currently there are no significant trends in NO3
− concentrations in Adirondack lakes.read more
Citations
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Is Nitrogen Deposition Altering the Nitrogen Status of Northeastern Forests
John D. Aber,Christine L. Goodale,Scott V. Ollinger,Melinda D. Smith,A. Magill,Mary E. Martin,Richard A. Hallett,John L. Stoddard,N. Participants +8 more
TL;DR: In this article, the authors present a new synthesis of existing data sets for the northeastern United States, intended to answer a single question: Is N deposition altering the N status of forest ecosystems in this region?
Journal ArticleDOI
Is Nitrogen Deposition Altering the Nitrogen Status of Northeastern Forests
John D. Aber,Christine L. Goodale,Scott V. Ollinger,Marie-Louise Smith,Alison H. Magill,Mary E. Martin,Richard A. Hallett,John L. Stoddard +7 more
TL;DR: In this article, the authors present a new synthesis of existing data sets for the northeastern United States, intended to answer a single question: Is N deposition altering the N status of forest ecosystems in this region?
Journal ArticleDOI
The biogeochemistry of calcium at Hubbard Brook
Gene E. Likens,Charles T. Driscoll,Donald C. Buso,Thomas G. Siccama,Chris E. Johnson,Gary M. Lovett,Timothy J. Fahey,William A. Reiners,Douglas F. Ryan,C.W. Martin,Scott W. Bailey +10 more
TL;DR: In this paper, a synthesis of the biogeochemistry of Ca was done during 1963-1992 in reference and human-manipulated forest ecosystems of the Hubbard BrookExperimental Forest (HBEF), NH.
Journal ArticleDOI
Climatic Control of Nitrate Loss from Forested Watersheds in the Northeast United States
Myron J. Mitchell,Charles T. Driscoll,Jeffrey S. Kahl,Gene E. Likens,Peter S. Murdoch,Linda H. Pardo +5 more
TL;DR: In this paper, the authors evaluated patterns of nitrate concentrations and losses in four forested watersheds (East Bear Brook Watershed, Lead Mountain, ME; Watershed 6, Hubbard Brook Experimental Forest, White Mountains, NH; Arbutus Watershed and Huntington Forest, Adirondack Mountains, NY; Biscuit Brook, Catskill mountains, NY) located across the northeastern United States.
Journal ArticleDOI
Spatial Variation among Lakes within Landscapes: Ecological Organization along Lake Chains
Patricia A. Soranno,Katherine E. Webster,Joan Lluís Riera,Timothy K. Kratz,Jill S. Baron,Paul A. Bukaveckas,George W. Kling,David S. White,Nel Caine,Richard C. Lathrop,Peter R. Leavitt +10 more
TL;DR: In this paper, the authors explore the spatial organization of lake districts through the concept of landscape position, a concept that considers lakes longitudinally along gradients of geomorphology and hydrology.
References
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Journal ArticleDOI
A Nonparametric Trend Test for Seasonal Data With Serial Dependence
TL;DR: In this article, an extension of the Mann-Kendall test for trend in seasonal (e.g., monthly) hydrologic time series is presented, which is robust against nonnormality and censoring.
Journal ArticleDOI
Changes in the chemistry of surface waters
Journal ArticleDOI
A simple approach for identifying and measuring acidification of freshwater
TL;DR: In this paper, an early warning indicator for acidification of lakes and rivers is proposed, based on excess sulphate concentrations, or current calcium concentrations and alkalinities, which can provide an estimate of the degree of acidification.
Journal ArticleDOI
Seasonal and long-term temporal patterns in the chemistry of Adirondack lakes
TL;DR: The Adirondack Long-Term Monitoring (ALTM) program was established in 1982 to evaluate changes in the chemistry of 17 ADIRONDACK lakes as discussed by the authors, which was largely due to differences in the supply of basic cations to drainage waters.
Journal ArticleDOI
The rate of acidification of aquatic ecosystems in Ontario, Canada
TL;DR: In this paper, the acidification rate of a lake that has undergone extensive damage to its aquatic biota as the result of deposition of acids of anthropogenic origin was measured by direct observations.
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