Document Detail

Comparison of a mass balance and an ecosystem model approach when evaluating the carbon cycling in a lake ecosystem.
MedLine Citation:
PMID:  17334055     Owner:  NLM     Status:  MEDLINE    
Carbon budgets are frequently used in order to understand the pathways of organic matter-in ecosystems, and they also have an important function in the risk assessment of harmful substances. We compared two approaches, mass balance calculations and an ecosystem budget, to describe carbon processing in a shallow, oligotrophic hardwater lake. Both approaches come to the same main conclusion, namely that the lake is a net autotrophic ecosystem, in spite of its high dissolved organic carbon and low total phosphorus concentrations. However, there were several differences between the carbon budgets, e.g. in the rate of sedimentation and the air-water flux of CO2. The largest uncertainty in the mass balance is the contribution of emergent macrophytes to the carbon cycling of the lake, while the ecosystem budget is very sensitive towards the choice of conversion factors and literature values. While the mass balance calculations produced more robust results, the ecosystem budget gave valuable insights into the pathways of organic matter transfer in the ecosystem. We recommend that when using an ecosystem budget for the risk assessment of harmful substances, mass balance calculations should be performed in parallel in order to increase the robustness of the conclusions.
Eva Andersson; Sebastian Sobek
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Ambio     Volume:  35     ISSN:  0044-7447     ISO Abbreviation:  Ambio     Publication Date:  2006 Dec 
Date Detail:
Created Date:  2007-03-05     Completed Date:  2007-03-27     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0364220     Medline TA:  Ambio     Country:  Sweden    
Other Details:
Languages:  eng     Pagination:  476-83     Citation Subset:  IM    
Swedish Nuclear Fuel and Waste Management Corporation, Stockholm.
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MeSH Terms
Carbon / analysis*,  chemistry,  metabolism
Carbon Dioxide
Environmental Pollutants
Fresh Water
Models, Theoretical*
Organic Chemicals
Risk Assessment
Reg. No./Substance:
0/Environmental Pollutants; 0/Organic Chemicals; 124-38-9/Carbon Dioxide; 7440-44-0/Carbon

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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