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Potential Nitrification and Denitrification on Different Surfaces in a Constructed Treatment Wetland

^a Dep. of Biology, Linköping Univ., SE-581 83 Linköping, Sweden
^b Dep. of Ecology/Limnology, Lund Univ., SE-223 62 Lund, Sweden
^c Dep. of Zoology, Univ. of Coimbra, 3004-517 Coimbra, Portugal

View larger version (20K): [in a new window]   Fig. 1. (A) The wetland of Hässleholm, comprising a common initial basin, (B–E) four parallel basins, and (F) a final common basin. The term x shows the sampling locations.

View larger version (20K): [in a new window]   Fig. 2. Oxygen concentrations in Basins B and D in July (black bars) and November (white bars). The data represent oxygen concentrations in the water at the inlets of the two basins (B1 and D1), at the outlets of the first (B2 and D2) and second (B3 and D3) sections, and at the outlet of the third section (B4 and D4).

View larger version (33K): [in a new window]   Fig. 3. Potential nitrification (black bars), potential denitrification (striped bars), and nitrate removal (white bars) on the surfaces of Eurasian watermilfoil, twigs, sediment, and macro-algae (biofilm area-1 in A; dry wt.-1 in B). The samples were collected in Basins B and D (n = 5). Error bars show SD.

View larger version (16K): [in a new window]   Fig. 4. Potential nitrification (black bars) and denitrification (white bars) on the surfaces in the D basin during July estimated per wetland surface area, using maximum and average biomass values for macro-algae and Eurasian watermilfoil, and surface area for sediment. Error bars show SD.