Details zur Publikation

Referenztyp Zeitschriften
DOI / URL Link
Titel (primär) Available dissolved organic carbon alters uptake and recycling of phosphorus and nitrogen from river sediments
Autor Stutter, M.; Graeber, D.; Weigelhofer, G.;
Journal / Serie Water
Erscheinungsjahr 2020
Department ASAM;
Band/Volume 12
Heft 12
Sprache englisch;
POF III (gesamt) T32;
Keywords macronutrients; stoichiometry; stream sediment; column experiments
Abstract

Concurrent with nutrient pollution, agriculture has significantly impacted the quantity, composition, and bioavailability of catchment-derived dissolved organic carbon (DOC) in stream ecosystems. Based on the stoichiometric theory, we tested the hypothesis that bioavailable DOC will stimulate the heterotrophic uptake of soluble reactive P (SRP) and inorganic nitrogen in stream sediments. In a simplified laboratory column flow-through study, we exposed stream sediments to additions of glucose, nitrate, and phosphate alone and in combination (+C, +NP, +CNP), and calculated gross and net changes in DOC and nutrients via a mass balance approach. Our results show that glucose-C increased nutrient uptake, but also that NP additions resulted in the enhanced consumption of both native and added organic C. The effects of C addition were stronger on N than P uptake, presumably because labile C stimulated both assimilation and denitrification, while part of the P uptake was due to adsorption. Internal cycling affected net nutrient uptake due to losses of dissolved organically-complexed P and N (DOP and DON). Overall, our study shows that increases in the stoichiometric availability of organic carbon can stimulate N and P sequestration in nutrient-polluted stream sediments. Future studies are required to assess the effects of complex organic carbon sources on nutrient uptake in stream sediments under different environmental conditions, and whether these stoichiometric relations are relevant for ecosystem management.

ID 23967
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=23967
Stutter, M., Graeber, D., Weigelhofer, G. (2020):
Available dissolved organic carbon alters uptake and recycling of phosphorus and nitrogen from river sediments
Water 12 (12), art. 3321