Journal ArticleDOI
Seasonal and long-term temporal patterns in the chemistry of Adirondack lakes
TLDR
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.Abstract:
There is considerable interest in the recovery of surface waters from acidification by acidic deposition. The Adirondack Long-Term Monitoring (ALTM) program was established in 1982 to evaluate changes in the chemistry of 17 Adirondack lakes. The ALTM lakes exhibited relatively uniform concentrations of SO42−. Lake-to-lake variability in acid neutralizing capacity (ANC) was largely due to differences in the supply of basic cations (Ca2+, Mg2+, K+, Na+; CB) to drainage waters. Lakes in the western and southern Adirondacks showed elevated concentrations of NO3−, while lakes in the central and eastern Adirondacks had lower NO3− concentrations during both peak and base flow periods. The ALTM lakes exhibited seasonal variations in ANC. Lake ANC was maximum during the late summer or autumn, and lowest during spring snowmelt. In general Adirondack lakes with ANC near 100 Μeq L−1 during base flow periods may experience decreases in ANC to near or below 0 Μeq L−1 during high flow periods. The ALTM lakes have exhibited long-term temporal trends in water chemistry. Most lakes have demonstrated declining SO42−, consistent with decreases in SO2 emissions and SO42− in precipitation in the eastern U.S. Reductions in SO42− have not coincided with a recovery in ANC. Rather, ANC values have declined in some ALTM lakes. This pattern is most likely due to increasing concentrations of NO3− that occurred in most of the ALTM drainage lakes.read more
Citations
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Journal ArticleDOI
Long-Term Effects of Acid Rain: Response and Recovery of a Forest Ecosystem
TL;DR: In this article, long-term data from the Hubbard Brook Experimental Forest, New Hampshire, suggest that although changes in stream pH have been relatively small, large quantities of calcium and magnesium have been lost from the soil complex and exported by drainage water because of inputs of acid rain and declines in atmospheric deposition of base cations.
Journal ArticleDOI
Effects of atmospheric ammonia (NH3) on terrestrial vegetation: a review.
TL;DR: Current information suggests that a critical load of 5-10 kg ha (-1) year(-1) of total N deposition (both dry and wet deposition combined of all atmospheric N species) would protect the most vulnerable terrestrial ecosystems (heaths, bogs, cryptogams) and values of 10-20 kg ha-1 year-1 would protect forests, depending on soil conditions.
Journal ArticleDOI
Nitrogen excess in North American ecosystems: Predisposing factors, ecosystem responses, and management strategies
Mark E. Fenn,Mark A. Poth,John D. Aber,Jill S. Baron,Bernard T. Bormann,Dale W. Johnson,A. Dennis Lemly,Steven G. McNulty,Douglas F. Ryan,Robert Stottlemyer +9 more
TL;DR: In this article, the authors identified forested areas that exhibit symptoms of N excess, analogous to overfertilization of arable land, and showed that some forests receiving chronic N inputs may decline in productivity and experience greate...
Journal ArticleDOI
Colder soils in a warmer world: A snow manipulation study in a northern hardwood forest ecosystem
Peter M. Groffman,Charles T. Driscoll,Timothy J. Fahey,Janet P. Hardy,Ross D. Fitzhugh,Geraldine L. Tierney +5 more
TL;DR: Hardy et al. as discussed by the authors presented results from asnow manipulation experiment in the northern hardwood forest ecosystem at the Hubbard BrookExperimental Forest in the White Mountains ofNew Hampshire, U.S.A. The treatment produced mild but persistent soil freezing and induced significant effects on rootmortality, soil nitrate (NO3−) levels and hydrologic fluxes of C, N and P.
Journal ArticleDOI
Consequences of climate warming and lake acidification for UV-B penetration in North American boreal lakes
TL;DR: The authors found that both climate warming and lake acidification led to declines in the dissolved organic carbon content of lake waters, allowing increased penetration of solar radiation, and suggested that some of the changes in aquatic ecosystems that have been attributed to acidification may in fact have involved increased exposure to ultraviolet light.
References
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TL;DR: The most widely read reference in the water industry, Water Industry Reference as discussed by the authors, is a comprehensive reference tool for water analysis methods that covers all aspects of USEPA-approved water analysis.
Journal ArticleDOI
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TL;DR: In this article, the authors present an overview of the role of soil in the formation and evolution of Soil Microbiology and Biochemistry in Perspective, as well as its relationship with Soil Organisms.
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Techniques of trend analysis for monthly water quality data
TL;DR: The seasonal Kendall test as discussed by the authors is a nonparametric test for trend applicable to data sets with seasonality, missing values, or values reported as "less than" or values below the limit of detection.
Journal ArticleDOI
Nitrogen saturation in northern forest ecosystems
TL;DR: In this article, the authors describe ways in which excess nitrogen from fossil fuel combustion may stress the biosphere, and the complexity of these effects on water quality and on forest nutrition is discussed.