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Influence of transient storage on stream nutrient uptake based on substrata manipulation

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  • Quantification of the transient storage zone (A[subscript s]) has become critical in stream biogeochemical studies addressed to examine factors controlling nutrient uptake. It is expected that higher A[subscript s] may enhance the interaction between nutrients and biota and thus, increase nutrient uptake. However, results from the literature are controversial. We hypothesized that besides of the size of A[subscript s], the intrinsic physical and biological characteristics of stream structures that generate A[subscript s] are also relevant for nutrient uptake. We performed 24 additions of phosphate, ammonium, and chloride in four reaches of a man-made channel where we introduced three types of naturally colonized substrata packs (mud, sand and cobbles) to modify A[subscript s]. We estimated ammonium and phosphate uptake coefficients in both the main channel and A[subscript s] using a solute transport model (OTIS-P) and compared the results among reaches with different substrata types. The introduction of substrata packs decreased water velocity and increased A[subscript s] similarly among treatments. Nutrient uptake coefficients in the main channel were similar among reaches with different type substrata packs; however, nutrient uptake coefficients measured in A[subscript s] differed among them as well as the ratio between ammonium and phosphorus uptake coefficients in A[subscript s], which were 1.6 in reaches with mud packs and 0.02 in reaches with sand or cobble packs. Results obtained in this study suggest that the contribution of A[subscript s] in nutrient uptake not only depends on the size of A[subscript s] but on the type of materials used to increase A[subscript s], and thus, have biogeochemical implications on restoration projects aimed to modify channel morphology.
  • Keywords: Stream, Nutrient assimilation, Ammonium, Transient storage, Nutrient cycling, Phosphoru
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  • Argerich, A., Marti, E., Sabater, F., Haggerty, R., & Ribot, M. (2011, August). Influence of transient storage on stream nutrient uptake based on substrata manipulation [Electronic version]. Aquatic Sciences, 73(3), 365-376. doi:10.1007/s00027-011-0184-9
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  • 73
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  • 3
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  • Financial support was provided by the European Union through the EURO-LIMPACS project (ref. GOCE-CT-2003-505540, http://www.eurolimpacs.ucl.ac.uk), by the Spanish Government through the NICON project (ref. CGL2005-07362-C02), and by the National Science Foundation (EAR 04-09534 and EAR 08-38338).
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