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Title: The potential of sedimentary phosphorus to sustain algal growth following reduction in external loading. Recycle pathways for phosphorus in lakes: evidence from large limnetic enclosures (Lund Tubes)
Author: C.S. Reynolds
Document Type: Monograph
Abstract:
This report describes new investigations of data accumulated during the years of the ‘Blelham Experiments’ and which provide clues about the relative importance of phosphorus recycling pathways in lakes and reservoirs. The understanding of these processes and, more importandy, of their relative scales, are essential to the comprehension and prediction of lake recovery rates, following restoration measures based upon, schemes to reduce external loads. Under the contractual arrangements agreed between the National Rivers Authority and the Association, the topic is being addressed in two ways: one is a review of the current general appreciation of recycle mechanisms, which has already been presented; this presentation of a case study in closed limnetic systems is the other. It demonstrates very clearly the major role of epilimnetic and shallow-water recycle pathways, in relation to the generally appreciated ‘Einsele-Mortimer’ model of redox-sensitive ‘release’ into anoxic hypolimnia of eutrophic lakes. Incidentally, it also underpins the generalisation of the IMSA review (see later) that the responses of deep lakes to eutrophication and restoration measures have been more consistent (and, hence, predictable) than those of shallow ones. The hypothesis set on in the Association’s R & D proposal, A05(91)la, that anaerobic dissolution of sedimented phosphorus is of secondary importance to aerobic mechanical release, is not disproved.
Publisher: Freshwater Biological Association
Publication Date: 1992
Publication Place: Ambleside
Subject Keywords: Nutrient cycling in ecosystemsLakesPhosphorusEutrophicationSedimentsChemical compositionSamplingChlorophyll aAlgaeCyanophyceae
Geographic Keywords: CumbriaBlelham Tarn
Taxonomic Keywords: Cyanobacteria
Extent: 38; + 6 tables, 6 figures
Permalink: http://www.environmentdata.org/archive/fbalc:68
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