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Denitrification Potential and Carbon Quality of Four Aquatic Plants in Wetland Microcosms

Ecological Engineering Group, Civil & Environmental Engineering Dep., Univ. of California at Berkeley, Berkeley, CA 94720-1710

View larger version (30K): [in a new window]   Fig. 1. Flow through microcosm assembly. Sixteen, water-sealed microcosms, split into four treatments of wetland plant litter (marsh pennywort, duckweed, bulrush, and cattail) in a random block design.

View larger version (27K): [in a new window]   Fig. 2. Proximate C composition of four wetland plants (marsh pennywort, duckweed, bulrush, and cattail) in: (a) fresh dry litter, (b) leached litter, and (c) bacterially colonized litter. Shaded bars (±1 SE; n = 4), show proportions of total the C pool from proximate contents reported by (Sarkanen and Ludwig, 1971) and (Westlake 1963).

View larger version (61K): [in a new window]   Fig. 3. Denitrification potential of four wetland plants by three bases of plant matter addition. Note, although there were significant differences (p < 0.01) in denitrification potential (±1 SE) on both a dry weight and total C basis, changing the basis to acid-soluble carbohydrates (ASC) reduces the significance of plant-specific differences (0.1 < p < 0.9).

View larger version (54K): [in a new window]   Fig. 4. Denitrification potential of four wetland plants on an acid-soluble carbohydrate (ASC) basis. Treatments simulated either Low (500 g C m2 yr-1) or High (2000 g C m2 yr-1) wetland productivity at equal nitrate (20 mg N L-1) feed concentrations. Note that denitrification potential presented decreases at higher ratios of applied carbohydrates to nitrate studied.