Skip to Main Content
A mechanistic assessment of nutrient flushing at the catchment scaleAuthor(s): Willem J. van Verseveld; Jeffrey J. McDonnell; Kate Lajtha
Source: Journal of Hydrology. 358: 268-287
Publication Series: Scientific Journal (JRNL)
Station: Pacific Northwest Research Station
View PDF (7.72 MB)
DescriptionThis paper mechanistically assesses the flushing mechanism of DOC, DON, and DIN at the hillslope and catchment scales during two storm events, in a small catchment (WS10), H.J. Andrews Experimental Forest in the western Cascade Mountains of Oregon. Using a combination of natural tracer and hydrometric data, and end-member mixing analysis, we were able to describe the exact flushing mechanism at the site. This mechanism involved vertical preferential flow to the soil-bedrock interface and then lateral downslope flow, with a finite source of DOC and DON in the organic horizon. Both specific UV absorbance (SUVA, 254 nm) and continuously measured raw fluorescence measured with a fluorometer increased during the storm events, suggesting DOC was more aromatic during stormflow compared to baseflow conditions. SUVA patterns in lateral subsurface flow from the hillslope and stream water in combination with hydrometric data enabled us to infer that the contribution of deep soil water and groundwater was higher during the falling limb compared to the rising limb of the hydrograph and contributed to the dilution of DOC, DON, and SUVA values during storm events. Overall this study showed the value of using a combination of hydrometric data, natural tracer data, and in particular DOC quality indices such as SUVA and fluorescence to mechanistically assess nutrient flushing at the catchment scale.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
Citationvan Verseveld, W.J.; McDonnell, J.J.; Lajtha, K. 2008. A mechanistic assessment of nutrient flushing at the catchment scale. Journal of Hydrology. 358: 268-287.
Keywordsnutrient flushing, catchment, dissolved organic carbon, dissolved organic nitrogen, specific UV absorbance fluorescence
- The role of hillslope hydrology in controlling nutrient loss
- An evaluation of the hydrologic relevance of lateral flow in snow at hillslope and catchment scales
- Stream dissolved organic matter bioavailability and composition in watersheds underlain with discontinuous permafrost
XML: View XML