Download e-book for kindle: Aquatic effects of acidic deposition by Timothy J Sullivan

By Timothy J Sullivan

ISBN-10: 1566704162

ISBN-13: 9781566704168

"While now not a regular information merchandise, acidic deposition continues to be a common factor for environmental managers and coverage makers. Emissions of sulfur and nitrogen from strength vegetation, commercial amenities, and motorcars - significant factors of acidic deposition - nonetheless pour into the ambience every day. Aquatic results of Acidic Deposition summarizes and synthesizes significant developments in medical research, Read more...

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1990a) was used for development of calibration equations. Substantial differences were observed in the diatom flora between Adirondack drainage and seepage lakes, and separate calibrations were developed for each lake type. There were 71 lakes included in the drainage lake calibrations (except for monomeric Al, where n = 62) and 20 lakes in the seepage lake calibrations. Historical change in pH and ANC from pre-industrial time to the present was quantified for 36 statistically selected Adirondack lakes included in the historical data set, based on diatom transfer functions.

05), considerably higher than that observed during fall. Aluminum has also been implicated as a causal factor in forest damage from acidic deposition. , 1992; Cronan and Grigal, 1995). Specifically, a reduction in the Ca/Al ratio in soil solution has been proposed as an indicator reflecting Al toxicity and nutrient imbalances in sensitive tree species. This topic was reviewed in detail by Cronan and Grigal (1995), who concluded that the Ca/Al molar ratio provides a valuable measurement endpoint for identification of approximate thresholds beyond which the risk of forest damage from Al stress and nutrient imbalances increases.

Additional difficulties in interpretation include a general lack of QA/QC data in most cases, potential climatological differences, land use changes, and statistical uncertainties associated with natural variability of lakes and streams. Furthermore, the “historical” measurements were typically taken in the 1930s or more recently and, thus, do not predate the occurrence of acidic deposition. Detection of significant, long-term pH changes in acidifying systems that are still in the bicarbonate buffered state cannot be made reliably because normal biologically-induced changes in CO2 levels would be likely to obscure any pH changes resulting from decreased alkalinity (Schofield, 1982; Norton and Henriksen, 1983).

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Aquatic effects of acidic deposition by Timothy J Sullivan


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