Association of riparian features and water chemistry with reed litter breakdown in a volcanic lake (Lake Vico, Italy)
Author(s)
Date Issued
2007
Type
Article
Abstract
To assess riparian influences on lake functioning and develop simple tools for lake health monitoring, the association of remotely-sensed riparian factors and water chemistry with the breakdown rate of reed litter was examined in Lake Vico, a
volcanic lake in central Italy. The decomposition rate of Phragmites australis was determined as leaf mass loss from litterbags at 6 locations during summer 2000.
Water temperature, dissolved oxygen, nitrogen and phosphorus concentrations, pH, conductivity, percent organic matter in sediments and effective fetch were
also assessed at each site. Riparian factors (i.e. shoreline complexity, riparian vegetation cover, and distance from shoreline) were estimated from satellite
images (Landsat VII). External organic loadings largely explained spatial heterogeneity in lake metabolism.
Decomposition was fastest in the northern area of the lake that drained most of the watershed, including a larger portion in wetland area. Rates correlated exponentially with soluble reactive phosphorus
(SRP) concentration, and were positively
associated with total-P (TP) concentration and organic matter percentage in sediments, which, in turn, were influenced by the riparian-related factors and waveexposure
(fetch). A relationship existed between the
index of riparian load, RL, which combined the three riparian-related factors, and both decomposition rate and SRP, suggesting that the riparian index is a promising cost-saving tool for monitoring lake function using remotely-sensed data.
Additional information
L'articolo รจ disponibile sul sito dell'editore http://www.springerlink.com/
Citation
Costantini, M.L. et al. 2007. Association of riparian features and water chemistry with reed litter breakdown in a volcanic lake (Lake Vico, Italy). "Aquatic Sciences" 69(4): 503-510
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