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Titolo:
Paleolimnological investigation of recent acidity changes in sawanoike Pond, Kyoto, Japan
Autore:
Yoshikawa, S; Yamaguchi, S; Hata, A;
Indirizzi:
Kyoto City Inst Publ Hlth & Environm Sci, Nakagyo Ku, Kyoto 6048845, JapanKyoto City Inst Publ Hlth & Environm Sci Kyoto Japan 6048845 8845, Japan Osaka City Univ, Fac Business, Sumiyoshi Ku, Osaka 558, Japan Osaka City Univ Osaka Japan 558 Business, Sumiyoshi Ku, Osaka 558, Japan
Titolo Testata:
JOURNAL OF PALEOLIMNOLOGY
fascicolo: 3, volume: 23, anno: 2000,
pagine: 285 - 304
SICI:
0921-2728(200003)23:3<285:PIORAC>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
CARBONACEOUS PARTICLES; DIATOM ASSEMBLAGES; METAL SPECIATION; LAKE-SEDIMENTS; ACIDIFICATION; NEUTRALIZATION; DEPOSITION; TRENDS;
Keywords:
paleolimnology; acidification; sediment chemistry; diatoms; metals; spheroidal carbonaceous particles; pollen; radionuclides; Japan;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
59
Recensione:
Indirizzi per estratti:
Indirizzo: Yoshikawa, S Kyoto City Inst Publ Hlth & Environm Sci, Nakagyo Ku, 1-2 Mibu Higashitakada, Kyoto 6048845, Japan Kyoto City Inst Publ Hlth & Environm Sci 1-2 Mibu Higashitakada Kyoto Japan 6048845
Citazione:
S. Yoshikawa et al., "Paleolimnological investigation of recent acidity changes in sawanoike Pond, Kyoto, Japan", J PALEOLIMN, 23(3), 2000, pp. 285-304

Abstract

Sawanoike Pond, an artificial reservoir constructed ca. 150 yrs. ago, liesin an area geologically sensitive to acidification and contains water thatis presently weakly acidic (pH 5.5; alkalinity 15 mu eq l(-1)). Sediments from a core obtained from the northern part and a core from the central part of the pond were analyzed for organic matter, total organic carbon, totalnitrogen, natural and artificial radionuclides, pollen, diatoms, metals and spheroidal carbonaceous particles. A peaty silt layer at the bottom of the central core was replaced by a silt layer initially rich in humic substances, but became more mineral-rich near the surface. Although most of the dominant diatoms throughout the cores were acidophilous taxa, some acidobiontic species increased moderately in abundance after the middle 1960's. Diatom-inferred pH values for the northern core are relatively low before about 1930, then increase, reaching a maximum level between the 1930's and the late 1940's. They then decrease to the surface and reach minimum level duringthe middle 1980's. Diatom-inferred pH declined by 0.4-0.5 units in the northern core and 0.2-0.3 units in the central core since ca. 1910, when vegetation around the shore changed to a community similar to that of recent years. An increase in labile Pb, Zn, Cd and spheroidal carbonaceous particles,indicative of atmospheric deposition of fossil fuel combustion by-products, preceded the decline in inferred pH. The inferred pH decline of the pond could be an acidification due to acidic precipitation caused by fossil fuelcombustion.

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Documento generato il 17/01/21 alle ore 18:32:42