caa a22 4500 445384034 CHVBK 20180317143026.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s10021-011-9483-1 doi (NATIONALLICENCE)springer-10.1007/s10021-011-9483-1 Effect of High Flow Events on In-Stream Dissolved Organic Nitrogen Concentration [Elektronische Daten] [Rebecca Martin, John Harrison] Dissolved organic nitrogen (DON) can comprise a large and biologically important fraction of total dissolved N in surface water. Biotic and abiotic processes result in heterogeneous DON concentrations and bioavailability in soils, and as hydrologic connectivity expands and flow paths change in watersheds, novel sources of DON can be mobilized and transported to surface water. Although the relationship between in-stream DOC concentration and stream discharge has previously been examined in the literature, up to now there has not been a synthesis examining how DON concentrations, loads, and composition change during transitions from base flow to pulse flow conditions. We present a meta-analysis examining the effect of high flow on DON concentration ([DON]). The ratio of mean pulse flow [DON] to mean base flow [DON] (P:B) was calculated for individual events and averaged (geometric) within and then across sites to generate an overall effect size. For 47 sites (78 events), mean P:B was 1.58, which was significantly different from unity. This moderate increase in DON concentration contributed to over a more than 10-fold average increase in the rate of DON yield from base flow to high flow. The response of [DON] to high flow was significant in catchments where individual storm events or snowmelt runoff events were responsible for elevated flows, whereas the response was not significant in catchments where high discharge resulted from a mixture of upstream snowmelt and rain events. Additionally, an examination of DOC:DON ratios during high flow indicates that multiple sources of DON may be mobilized during high flow. Finally, current models of annual DON export may be improved by including a positive relationship between discharge and DON. Springer Science+Business Media, LLC, 2011 nitrogen nationallicence dissolved organic nitrogen nationallicence DON nationallicence flow paths nationallicence hydrologic event nationallicence nitrogen export nationallicence stream nationallicence Martin Rebecca Washington State University, 14204 NE Salmon Creek Avenue, 98686, Vancouver, Washington, USA aut Harrison John Washington State University, 14204 NE Salmon Creek Avenue, 98686, Vancouver, Washington, USA aut Ecosystems Springer-Verlag 14/8(2011-12-01), 1328-1338 1432-9840 14:8<1328 2011 14 10021 https://doi.org/10.1007/s10021-011-9483-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10021-011-9483-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Martin Rebecca Washington State University, 14204 NE Salmon Creek Avenue, 98686, Vancouver, Washington, USA aut NATIONALLICENCE 700 1- Harrison John Washington State University, 14204 NE Salmon Creek Avenue, 98686, Vancouver, Washington, USA aut NATIONALLICENCE 773 0- Ecosystems Springer-Verlag 14/8(2011-12-01), 1328-1338 1432-9840 14:8<1328 2011 14 10021 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer