Warianty tytułu
Języki publikacji
Abstrakty
Lowland rivers in industrial countries such as the UK are seriously impacted by phosphorus from a variety of sources. Point sources include numerous sewage-treatment works; diffuse sources include a full range of agricultural activities from fertiliser application to intensive poultry and stock rearing. The scientific consensus is that the concentration of phosphorus is an important measure of eutrophication. The present study investigated the impact of point source effluents, together with physical impoundment by weirs, on the spatial heterogeneity of river bed sediment characteristics with emphasis on the forms and levels of phosphorus, within the catchment area of the River Wensum, Norfolk, UK. The within site variability of the sediment characteristics (total phosphorus, bioavailable phosphorus, calcium, iron and organic matter) was tightly linked to the river bed types. Total phosphorus in the sediment was extremely well correlated with total iron (r=0.93) suggesting a possible association between the two parameters. The weirs and impoundments impacted dramatically on the dynamics of instream flow which resulted in extensive problems of siltation in the River Wensum leading to high level of total phosphorus storage above the weir. This, combined with the increased concentration of total phosphorus in the water below the point sources, had the greatest impact on sediment phosphorus availability. Thus the ecology of the river may not follow expected downstream changes.
Wydawca
Rocznik
Tom
Numer
Opis fizyczny
p.149-164,fig.,ref.
Twórcy
Bibliografia
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.agro-article-1e7d8cd0-f1dd-4a4f-b0f3-fc9f757bd315
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.