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Long-term homeostasis of filterable un-reactive phosphorus in a shallow eutrophic lake following a significant reduction in catchment load

Spears, Bryan M.; May, Linda. 2015 Long-term homeostasis of filterable un-reactive phosphorus in a shallow eutrophic lake following a significant reduction in catchment load [in special issue: Developments in soil organic phosphorus cycling in natural and agricultural ecosystems] Geoderma, 257-258. 78-85. https://doi.org/10.1016/j.geoderma.2015.01.005

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Abstract/Summary

We demonstrate the use of long-term (1985–2008) filterable un-reactive phosphorus (FURP) concentration data from Loch Leven, Scotland, UK, to explore responses of in-lake FURP concentrations following a significant reduction of catchment P loading (i.e., from 25.5 t TP yr− 1 in 1985 to 7.0 t TP yr− 1 and 11.6 t TP yr− 1 in 1995 and 2005, respectively), including FURP load reduction (i.e., from 10.2 t FURP yr− 1 in 1985 to < 1.6 t FURP yr− 1 in 1995 and 2005). The reduction in FURP loading was achieved mainly through the control of an industrial point source. The concentration of FURP in Loch Leven did not decrease following the reduction in catchment loading, remaining at around 10–40 μg FURP L− 1 during the monitoring period. In addition, the contribution of FURP to TP in the water column increased after 2000 from < 40% to < 80% up to 2008. Loch Leven switched from being a sink of FURP in 1985 (retention of 8.7 t FURP yr− 1) to being a source of FURP to downstream ecosystems in 1995 (relinquishment of 0.3 t FURP yr− 1) and 2005 (relinquishment of 0.02 t FURP yr− 1). These results indicate a complex series of processes resulting in conditions of homeostasis of FURP in Loch Leven, regardless of the catchment load.

Item Type: Publication - Article
Digital Object Identifier (DOI): https://doi.org/10.1016/j.geoderma.2015.01.005
CEH Sections/Science Areas: Watt
ISSN: 0016-7061
Additional Keywords: eutrophication, filterable un-reactive phosphorus, dissolved organic phosphorus, catchment management, internal loading
NORA Subject Terms: Ecology and Environment
Hydrology
Date made live: 10 Mar 2016 11:15 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/513225

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