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  • 1
    ISSN: 1573-2932
    Keywords: Reliming ; reacidification ; metals ; eutrophication ; Myriophyllum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Long term liming and reacidification effects were studied in SW Sweden. This report is a concentrated summary. Lake liming reduces toxic levels of Al, Cd and Zn so that pH-sensitive species can survive. But it mobilizes nutrients and causes internal eutrophication, which in shallow lakes may give problems as macrophyte expansion. Reacidification kills much of the flora and fauna, that adapted during limed conditions. The reasons are lowered pH and toxic levels: Al 500 ug/1, Cd 0.4 ug/1 and Zn 50 ug/1. Sediments are fragile and temporary refuges for metals and nutrients. Conclusively, surface waters should be limed before they reach lakes.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-2932
    Keywords: Acidification ; liming ; wetlands ; streams ; water chemistry ; metals ; Sweden
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Acidic precipitation has caused damage to the populations of fish and invertebrates in numerous streams in the southern part of the Swedish mountain range. In the middle of the 70's, the pH of precipitation decreased and has since then frequently been lower than 4.5. Many of the streamwaters were well buffered during most time of the year, but during periods with high discharge, the buffering capacity was completely exhausted, pH frequently decreased to around 4.5 and very high levels of Fe, Mn and Al occurred. In general, base cations (BC) and organic anions decreased during periods of high flow, while SO4 increased or was relatively independent of flow. On an average, the ratio SO4/BC was negatively correlated to pH, while organic anions/BC showed a weaker correlation to pH. In order to investigate if wetland liming could be used as a remedial measure in such areas, lime treatments were started in 1983 in the Lofsdalen area, province of Härjedalen. The liming stabilized the alkalinity and pH of the streams at circum-neutral levels, and reduced the leaching of Fe, Mn, and Al. The average levels of these elements decreased and the seasonal fluctuation decreased considerably.
    Type of Medium: Electronic Resource
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