Paleoecological Evaluation of the Recent Acidification of Susceptible Lakes in Finland
The aims of this study were to reveal the causes of lake acidification and to study the acidification history and areal distribution of acidification of Finnish lakes. The 30 lakes selected for this study were mainly oligotrophic forest lakes. They do not represent statistically all lakes in Finland...
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1990
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ftvttcrispub:oai:cris.vtt.fi:publications/c4a08983-d870-427c-8d97-de10b9ade78a 2023-05-15T17:42:35+02:00 Paleoecological Evaluation of the Recent Acidification of Susceptible Lakes in Finland Huttunen, Pertti Kenttämies, Kaarle Liehu, Anita Liukkonen, Mikko Nuotio, Tarja Sandman, Olavi Turkia, Jaana Kauppi, Pekka Anttila, Pia Kenttämies, Kaarle 1990 https://cris.vtt.fi/en/publications/c4a08983-d870-427c-8d97-de10b9ade78a http://hdl.handle.net/10138/17420 eng eng Springer info:eu-repo/semantics/restrictedAccess Huttunen , P , Kenttämies , K , Liehu , A , Liukkonen , M , Nuotio , T , Sandman , O & Turkia , J 1990 , Paleoecological Evaluation of the Recent Acidification of Susceptible Lakes in Finland . in P Kauppi , P Anttila & K Kenttämies (eds) , Acidification in Finland . Springer , pp. 1071-1092 . < http://hdl.handle.net/10138/17420 > bookPart 1990 ftvttcrispub 2022-10-13T13:53:24Z The aims of this study were to reveal the causes of lake acidification and to study the acidification history and areal distribution of acidification of Finnish lakes. The 30 lakes selected for this study were mainly oligotrophic forest lakes. They do not represent statistically all lakes in Finland but are the most interesting, sensitive lakes. Estimates of inferred pH and alkalinity from sediment diatom assemblages were based on a calibration set of 92 lakes with surface sediment diatom assemblages and the corresponding chemistry of autumnal water samples. Of the studied 30 lakes, 43% had a significant recent decrease in alkalinity, 20% were naturally acidic, and 27% were with no acidification trends. Lakes with sediment with poorly preserved diatom frustules were 10% of the whole material. At all sites where recent acidification was recorded and the lake was deep enough, the proportion of planktonic diatoms decreased remarkably. In naturally acidic lakes, abundances of diatom plankton have also declined during the last century. In this study the chemical models used showed both larger and smaller acidification than the estimates from the palaeoecological approach. The recent acidification of small forest lakes is restricted to southern Finland where almost all acidic lakes have acidified since 1900. In central and northern Finland, on the other hand, the proportion of naturally acidic lakes is higher. Book Part Northern Finland VTT's Research Information Portal |
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VTT's Research Information Portal |
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ftvttcrispub |
language |
English |
description |
The aims of this study were to reveal the causes of lake acidification and to study the acidification history and areal distribution of acidification of Finnish lakes. The 30 lakes selected for this study were mainly oligotrophic forest lakes. They do not represent statistically all lakes in Finland but are the most interesting, sensitive lakes. Estimates of inferred pH and alkalinity from sediment diatom assemblages were based on a calibration set of 92 lakes with surface sediment diatom assemblages and the corresponding chemistry of autumnal water samples. Of the studied 30 lakes, 43% had a significant recent decrease in alkalinity, 20% were naturally acidic, and 27% were with no acidification trends. Lakes with sediment with poorly preserved diatom frustules were 10% of the whole material. At all sites where recent acidification was recorded and the lake was deep enough, the proportion of planktonic diatoms decreased remarkably. In naturally acidic lakes, abundances of diatom plankton have also declined during the last century. In this study the chemical models used showed both larger and smaller acidification than the estimates from the palaeoecological approach. The recent acidification of small forest lakes is restricted to southern Finland where almost all acidic lakes have acidified since 1900. In central and northern Finland, on the other hand, the proportion of naturally acidic lakes is higher. |
author2 |
Kauppi, Pekka Anttila, Pia Kenttämies, Kaarle |
format |
Book Part |
author |
Huttunen, Pertti Kenttämies, Kaarle Liehu, Anita Liukkonen, Mikko Nuotio, Tarja Sandman, Olavi Turkia, Jaana |
spellingShingle |
Huttunen, Pertti Kenttämies, Kaarle Liehu, Anita Liukkonen, Mikko Nuotio, Tarja Sandman, Olavi Turkia, Jaana Paleoecological Evaluation of the Recent Acidification of Susceptible Lakes in Finland |
author_facet |
Huttunen, Pertti Kenttämies, Kaarle Liehu, Anita Liukkonen, Mikko Nuotio, Tarja Sandman, Olavi Turkia, Jaana |
author_sort |
Huttunen, Pertti |
title |
Paleoecological Evaluation of the Recent Acidification of Susceptible Lakes in Finland |
title_short |
Paleoecological Evaluation of the Recent Acidification of Susceptible Lakes in Finland |
title_full |
Paleoecological Evaluation of the Recent Acidification of Susceptible Lakes in Finland |
title_fullStr |
Paleoecological Evaluation of the Recent Acidification of Susceptible Lakes in Finland |
title_full_unstemmed |
Paleoecological Evaluation of the Recent Acidification of Susceptible Lakes in Finland |
title_sort |
paleoecological evaluation of the recent acidification of susceptible lakes in finland |
publisher |
Springer |
publishDate |
1990 |
url |
https://cris.vtt.fi/en/publications/c4a08983-d870-427c-8d97-de10b9ade78a http://hdl.handle.net/10138/17420 |
genre |
Northern Finland |
genre_facet |
Northern Finland |
op_source |
Huttunen , P , Kenttämies , K , Liehu , A , Liukkonen , M , Nuotio , T , Sandman , O & Turkia , J 1990 , Paleoecological Evaluation of the Recent Acidification of Susceptible Lakes in Finland . in P Kauppi , P Anttila & K Kenttämies (eds) , Acidification in Finland . Springer , pp. 1071-1092 . < http://hdl.handle.net/10138/17420 > |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1766144463545040896 |