caa a22 4500 605517150 CHVBK 20210128100718.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s10533-014-0062-3 doi (NATIONALLICENCE)springer-10.1007/s10533-014-0062-3 Effects of nitrogen and phosphorus load reduction on benthic phosphorus release in a riverine lake [Elektronische Daten] [B. Grüneberg, T. Dadi, C. Lindim, H. Fischer] The Lower Havel in Berlin is a polymictic riverine lake, thermally stratified for some days or weeks in summer. It is characterized by a relatively high mean total phosphorus concentration (145µgl−1) and frequent cyanobacteria mass development in summer. We quantified the potentially mobile P pool in sediments, determined P fluxes based on conventional dialysis sampler-, gel probe- and benthic chamber measurements, and combined this with column experiments and P budget calculations to evaluate whether a) a reduction of P loading would be counterbalanced by P release from sediment, and b) release of redox sensitive P would even increase with reduction of nitrogen loading. The potentially mobile P pool was relatively small (228t) compared to mean annual external load (190ta−1) and gross P release (1.2-36mgm−2day−1), and was thus of little relevance for long-term P availability. Despite 38% of P in the sediment being redox sensitive, the seasonal course of P gross release was mainly driven by redox independent organic matter mineralization of diagenetically young surface sediment. Under anoxic conditions, P release was higher than under oxic conditions and to some extent controlled by nitrate under laboratory conditions. However, ambient nitrate availability was too low to affect P release which was more dependent on mineralization and Fe availability than on redox. Therefore, the Lower Havel would benefit from P load reduction but internal P loading would be largely unaffected from further N load reduction. Springer International Publishing Switzerland, 2014 P budget nationallicence Diffusive flux nationallicence Benthic chamber nationallicence P pool nationallicence Temporary storage nationallicence Nitrate nationallicence Grüneberg B. Brandenburg University of Technology Cottbus-Senftenberg, Seestr. 45, 15526, Bad Saarow, Germany aut Dadi T. Brandenburg University of Technology Cottbus-Senftenberg, Seestr. 45, 15526, Bad Saarow, Germany aut Lindim C. Federal Institute of Hydrology, Am Mainzer Tor 1, 56068, Koblenz, Germany aut Fischer H. Federal Institute of Hydrology, Am Mainzer Tor 1, 56068, Koblenz, Germany aut Biogeochemistry Springer International Publishing 123/1-2(2015-03-01), 185-202 0168-2563 123:1-2<185 2015 123 10533 https://doi.org/10.1007/s10533-014-0062-3 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10533-014-0062-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Grüneberg B. Brandenburg University of Technology Cottbus-Senftenberg, Seestr. 45, 15526, Bad Saarow, Germany aut NATIONALLICENCE 700 1- Dadi T. Brandenburg University of Technology Cottbus-Senftenberg, Seestr. 45, 15526, Bad Saarow, Germany aut NATIONALLICENCE 700 1- Lindim C. Federal Institute of Hydrology, Am Mainzer Tor 1, 56068, Koblenz, Germany aut NATIONALLICENCE 700 1- Fischer H. Federal Institute of Hydrology, Am Mainzer Tor 1, 56068, Koblenz, Germany aut NATIONALLICENCE 773 0- Biogeochemistry Springer International Publishing 123/1-2(2015-03-01), 185-202 0168-2563 123:1-2<185 2015 123 10533