Document Detail

Resuspension-mediated temporal variation in phosphorus concentrations and internal loading.
MedLine Citation:
PMID:  19202026     Owner:  NLM     Status:  MEDLINE    
Sediment resuspension is an important factor for nutrient cycling in shallow lakes. Temporal variation in sediment resuspension and its influence on P concentrations and internal loading were studied in the shallow and eutrophic Kirkkojärvi basin. Gross sedimentation and sediment resuspension were estimated with sediment traps during three exposure periods in spring, midsummer, and autumn. The effects of resuspension on the concentrations of suspended solids, total phosphorus (TP), soluble reactive P, and chlorophyll a were followed. The level of sediment resuspension was greatest in midsummer (July-August 63.9 g dw m(-2) d(-1)), due to strong phytoplankton blooms modifying the surface film of the sediment more prone to resuspension. The dependence of high total P concentrations (226-385 microg L(-1)) on sediment resuspension and suspended solids was significant at the time. The concentrations of soluble reactive P were also high in midsummer (52-91 microg L(-1)), but had a negative dependence on suspended solids. This dependence was due to algal assimilation as was proved by a negative effect of chlorophyll a on soluble reactive P. Consequently, we suggest that the increase in the total P concentrations caused by sediment resuspension in midsummer was possibly intensified by strong algal blooms occurring at the time because strong assimilation resulting in high pH (pH 7.3 in May, 9.3-10.2 in July-August, 7.6 in October) may have increased the desorption of P from the suspended inorganic particles and intensified the P transfer into the phytoplankton biomass in midsummer.
Juha P Niemistö; Heidi Holmroos; Leena Nurminen; Jukka Horppila
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-02-06
Journal Detail:
Title:  Journal of environmental quality     Volume:  38     ISSN:  0047-2425     ISO Abbreviation:  J. Environ. Qual.     Publication Date:    2009 Mar-Apr
Date Detail:
Created Date:  2009-02-09     Completed Date:  2009-04-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0330666     Medline TA:  J Environ Qual     Country:  United States    
Other Details:
Languages:  eng     Pagination:  560-6     Citation Subset:  IM    
Dep. of Biological and Environmental Sciences/Limnology, P.O. Box 65 (Viikinkaari 1), FIN 00014 Univ. of Helsinki, Finland.
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MeSH Terms
Aluminum / analysis
Chlorophyll / analysis
Fresh Water / analysis*
Geologic Sediments / analysis*
Hydrogen-Ion Concentration
Iron / analysis
Phosphorus / analysis*
Phytoplankton / metabolism
Time Factors
Reg. No./Substance:
1406-65-1/Chlorophyll; 479-61-8/chlorophyll a; 7429-90-5/Aluminum; 7439-89-6/Iron; 7723-14-0/Phosphorus

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