Importance of diffuse nutrient loading and lake level changes to the eutrophication of an originally oligotrophic boreal lake: a palaeolimnological diatom and chironomid analysis

被引：0
作者：
Jarmo J. Meriläinen
Juhani Hynynen
Arja Palomäki
Pasi Reinikainen
Anssi Teppo
Kaj Granberg
机构：
[1] University of Jyväskylä,Institute for Environmental Research
[2] University of Jyväskylä,Institute for Environmental Research
[3] University of Jyväskylä,Institute for Environmental Research
[4] West Finland Regional Environment Centre,undefined
[5] Central Finland Regional Environment Centre,undefined
来源：
Journal of Paleolimnology | 2000年 / 24卷
关键词：
jpalaeolimnology; boreal lake; diffuse loading; eutrophication; sediment; trophic state; diatoms; chironomids; Finland;
D O I：
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学科分类号：
摘要：
The recent environmental history of Lake Lappajärvi in western Finland (63°00′ N, 23°30′ E, area 149 km2), a humic, brown water lake with an average phosphorus content of ca. 20 μg l–1, was studied from short core sediment samples taken from the two main basins of the lake. Based on the stratigraphy of diatoms and chironomids and the sediment quality it was possible to distinguish four developmental stages during the past century: (1) a pre-industrial stage covering the time up to about 1935; (2) a stage of increasing nutrient loading (ca. 1936–1960); (3) a stage of pronounced erosion from lake level regulation and extensive ditching of the catchment area (ca. 1960–1970); and (4) a meso-eutrophic stage from ca. 1970 onwards.
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页码：251 / 270
页数：19
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