Hyporheic exchange and fulvic acid redox reactions in an alpine stream/wetland ecosystem, Colorado front range
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Abstract
The influence of hyporheic zone interactions on the redox state of fulvic acids and other redox active species was investigated in an alpine stream and adjacent wetland, which is a more reducing environment. A tracer injection experiment using bromide (Br-) was conducted in the stream system. Simulations with a transport model showed that rates of exchange between the stream and hyporheic zone were rapid (α ≈ 10-3 s-1). Parallel factor analysis of fluorescence spectra was used to quantify the redox state of dissolved fulvic acids. The rate coefficient for oxidation of reduced fulvic acids (λ = 6.5 × 10-3 s-1) in the stream indicates that electron-transfer reactions occur over short time scales. The rate coefficients for decay of ammonium (λ = 1.2 × 10-3 s-1) and production of nitrate (λ = −1.0 × 10-3 s-1) were opposite in sign but almost equal in magnitude. Our results suggest that fulvic acids are involved in rapid electron-transfer processes in and near the stream channel and may be important in determining ecological energy flow at the catchment scale.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Hyporheic exchange and fulvic acid redox reactions in an alpine stream/wetland ecosystem, Colorado front range |
| Series title | Environmental Science & Technology |
| DOI | 10.1021/es060635j |
| Volume | 40 |
| Issue | 19 |
| Year Published | 2006 |
| Language | English |
| Publisher | ACS Publications |
| Contributing office(s) | Colorado Water Science Center, Toxic Substances Hydrology Program |
| Description | 7 p. |
| First page | 5943 |
| Last page | 5949 |
| Country | United States |
| State | Colorado |
| Other Geospatial | Colorado Front Range |
| Google Analytic Metrics | Metrics page |