Probably too small to contribute substantially to SRP stream concentrations. Pore water from the stream sediment showedĮvidence of reductive mobilization of SRP, but the exchange fluxes were Taken under summer low-flow conditions revealed that the stream water SRPĬoncentrations, the fraction of SRP within total dissolved P (TDP), and DOC radiocarbon ages matched those in the groundwaterĮntering the gaining section. Responsible for most of the SRP fluxes to the stream. Indicate that a single short section in the upper headwater reach was Mobilization from riparian wetlands and stream sediments. We used salt dilution tests and naturalĢ22Rn to determine water fluxes in different sections of the stream,Īnd we sampled for SRP, Fe, and 14C dissolved organic carbon (DOC) to examine possible redox-mediated We carried out three longitudinal stream sampling campaigns for SRPĬoncentrations and fluxes. Releases from soil drainage, anoxic riparian wetlands, and stream sediments Of this study is therefore to differentiate between potential SRP losses and Spatial distribution, and temporal dynamics are often unknown. These SRPĬoncentrations often exceed eutrophication levels, but their main sources, Soluble reactive phosphorus (SRP) concentrations inĪgricultural headwaters can display pronounced seasonal variability at lowįlow, often with the highest concentrations occurring in summer.
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