Water quality impacts of mechanical shredding of aquatic macrophytes

James, William F. and Barko, J.W. and Eakin, H.L. (2002) Water quality impacts of mechanical shredding of aquatic macrophytes. Journal of Aquatic Plant Management, 40, pp. 36-42.

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We examined the impacts of mechanical shredding (i.e.. shredding plants and leaving biomass in the system) of the water chestnut (Trapa natans) on water quality and nutrient mobilization in a control and experimental site in Lake Champlain (Vermont-New York). A 1-ha plot was mechanically shredded within 1 h on 26 July, 1999. Broken plant material was initially concentrated on the lake surface of the experimental station after shredding, and was noticeable on the lake surface for 19 d. Over a two week period after shredding. concentrations of total nitrogen (N) and phosphorus (P), and soluble reactive P increased in the lower water column of the experimental station, coinciding with decomposition of water chestnut. Sediments in the control and experimental stations exhibited vet-v low rates of N and P release and could not account for increases in nutrient concentrations in the water column after mechanical shredding. Shredded plant material deployed in mesh bags at the experimental station lost similar to 70% of their total mass, and 42%, N and 70% P within 14 d. indicating Substantial nutrient mobilization via autolysis and decomposition. Chlorophyll a concentrations increased to 35 g/L at the experimental station on day 7 after shredding, compared to a concentration of 4 g/L at the control station. suggesting uptake of mobilized nutrients by phytoplankton. Disruption Of the Surface canopy of water chestnut by shredding was associated with marked increases in turbidity and dissolved oxygen, suggesting increased mixing at the experimental site.

Item Type: Article
Title: Water quality impacts of mechanical shredding of aquatic macrophytes
Personal Creator/Author:
James, William F.
Barko, J.W.
Eakin, H.L.
Refereed: Yes
Journal or Publication Title: Journal of Aquatic Plant Management
Volume: 40
Page Range: pp. 36-42
Date: 2002
Issuing Agency: Aquatic Plant Management Society, Inc.
Uncontrolled Keywords: nutrient recycling; plant decomposition; sediment flux; Trapa natans; water chestnut
Subjects: Ecology
Item ID: 1752
Depositing User: Sciences Librarian Peter Fritzler
Date Deposited: 23 Nov 2008 00:18
Last Modified: 29 Sep 2011 20:10
URI: http://aquaticcommons.org/id/eprint/1752

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