naa a22 4500 51074947X CHVBK 20180411083059.0 cr unu---uuuuu 180411e20130901xx s 000 0 eng 10.1007/s11270-013-1643-9 doi (NATIONALLICENCE)springer-10.1007/s11270-013-1643-9 Relating P Lability in Stream Sediments to Watershed Land Use via an Effective Sequential Extraction Scheme [Elektronische Daten] [Silja Hund, Sandra Brown, Les Lavkulich, Sascha Oswald] High applications of P fertilizers and manure are general practice in intensive agriculture and may cause eutrophication in adjacent streams. Bioavailability of P can be estimated by sequential extractions commonly used for soil or sediment. A single combined method may facilitate more effective comparisons of topsoils and adjoining stream sediments, and enhance management decisions. In this study, the suitability of an established soil P sequential extraction was tested on stream bed sediments. The study was conducted in the Sumas River watershed in the agricultural Lower Fraser Valley, Canada. Sediment samples with differing land use (forest, low and high intensity agriculture) from 1993, 1994, 2008, and 2009 from 14 sites along the Sumas River and tributaries were used. Total sequential extraction concentrations were in agreement with aqua regia digestion (Rs = 0.96) and showed consistency over the study time sequence. P fractions released by 0.5M NaHCO3 (median 14%), 0.1M NaOH (33%), and 1.0M HCl (38%) were significantly (α = 0.05) higher than P released by other extractants. These three extraction steps provide a practical and time-effective assessment of P lability in stream sediments and may be used as a combined scheme for sediment and soil. Analytical results further revealed that land use has a major and characteristic impact on P lability. With a land use change from forest to intensive agriculture, results showed an increase in total P concentrations (30 to 4,000ppm) and in P lability, in particular for the moderately labile NaOH-P fraction (20 to 50%). Springer Science+Business Media Dordrecht, 2013 Phosphorus nationallicence Eutrophication nationallicence Availability nationallicence Sequential extraction nationallicence Agriculture nationallicence River bed sediment nationallicence P : Phosphorus nationallicence Rs : Spearman rank correlation coefficient nationallicence M : Molar concentration (molL−1) nationallicence NaHCO3 : Sodium bicarbonate nationallicence NaOH : Sodium hydroxide nationallicence HCl : Hydrochloric acid nationallicence AAO : Acid ammonium oxalate nationallicence AQ : Aqua regia digestion nationallicence SEQ : Sequential extraction nationallicence SR : Sumas River nationallicence SC : Swift Creek nationallicence AS : Arnold Slough nationallicence MC : Marshall Creek nationallicence R 2 : Linear Pearson regression coefficient nationallicence Hund Silja Faculty of Land and Food Systems, University of British Columbia, 2357 Main Mall, BC V6T 1Z4, Vancouver, Canada aut Brown Sandra Faculty of Land and Food Systems, University of British Columbia, 2357 Main Mall, BC V6T 1Z4, Vancouver, Canada aut Lavkulich Les Faculty of Land and Food Systems, University of British Columbia, 2357 Main Mall, BC V6T 1Z4, Vancouver, Canada aut Oswald Sascha Institute of Earth and Environmental Science, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14476, Golm, Potsdam, Germany aut Water, Air, & Soil Pollution Springer Netherlands 224/9(2013-09-01), 1-13 0049-6979 224:9<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1643-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1643-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hund Silja Faculty of Land and Food Systems, University of British Columbia, 2357 Main Mall, BC V6T 1Z4, Vancouver, Canada aut NATIONALLICENCE 700 1- Brown Sandra Faculty of Land and Food Systems, University of British Columbia, 2357 Main Mall, BC V6T 1Z4, Vancouver, Canada aut NATIONALLICENCE 700 1- Lavkulich Les Faculty of Land and Food Systems, University of British Columbia, 2357 Main Mall, BC V6T 1Z4, Vancouver, Canada aut NATIONALLICENCE 700 1- Oswald Sascha Institute of Earth and Environmental Science, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14476, Golm, Potsdam, Germany aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/9(2013-09-01), 1-13 0049-6979 224:9<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer