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

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Publication date: November 2015
Source:Geoderma, Volumes 257–258
Author(s): Bryan M. Spears , Linda May
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 25.5tTPyr1 in 1985 to 7.0tTPyr1 and 11.6tTPyr1 in 1995 and 2005, respectively), including FURP load reduction (i.e., from 10.2tFURPyr1 in 1985 to <1.6tFURPyr1 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 10–40μgFURPL1 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 8.7tFURPyr1) to being a source of FURP to downstream ecosystems in 1995 (relinquishment of 0.3tFURPyr1) and 2005 (relinquishment of 0.02tFURPyr1). These results indicate a complex series of processes resulting in conditions of homeostasis of FURP in Loch Leven, regardless of the catchment load.

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