Denitrification potential in relation to lithology in five headwater riparian zones

Journal of Environmental Quality
Alan R HillJackson Langat

Abstract

The influence of riparian zone lithology on nitrate dynamics is poorly understood. We investigated vertical variations in potential denitrification activity in relation to the lithology and stratigraphy of five headwater riparian zones on glacial till and outwash landscapes in southern Ontario, Canada. Conductive coarse sand and gravel layers occurred in four of the five riparian areas. These layers were thin and did not extend to the field-riparian perimeter in some riparian zones, which limited their role as conduits for ground water flow. We found widespread organic-rich layers at depths ranging from 40 to 300 cm that resulted from natural floodplain processes and the burial of surface soils by rapid valley-bottom sedimentation after European settlement. The organic matter content of these layers varied considerably from 2 to 5% (relic channel deposit) to 5 to 21% (buried soils) and 30 to 62% (buried peat). Denitrification potential (DNP) was measured by the acetylene block method in sediment slurries amended with nitrate. The highest DNP rates were usually found in the top 0- to 15-cm surface soil layer in all riparian zones. However, a steep decline in DNP with depth was often absent and high DNP activity occurred in the d...Continue Reading

Citations

Jun 30, 2015·The Science of the Total Environment·Jing HuK Ramesh Reddy
Aug 28, 2013·Environmental Management·Keith E SchillingE Arthur Bettis
Apr 18, 2016·Environmental Monitoring and Assessment·Joshua GomezMyron Mitchell
Jan 12, 2007·Journal of Environmental Quality·Edward MehnertThomas R Holm
Apr 10, 2008·Journal of Environmental Quality·William D Robertson, Sherry L Schiff
Mar 11, 2005·Journal of Environmental Quality·D Q KelloggG Blazejewski
Jun 29, 2007·Journal of Environmental Quality·Paul M MayerTimothy J Canfield
Mar 22, 2021·The Science of the Total Environment·Xiaolan LinHisao Kuroda
Aug 30, 2017··Lina Bagdžiūnaitė-LitvinaitienėAndrius Litvinaitis

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