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Long-Term Response of a Forest Watershed EcosystemClearcutting in the Southern Appalachians$
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Wayne T. Swank and Jackson R. Webster

Print publication date: 2014

Print ISBN-13: 9780195370157

Published to Oxford Scholarship Online: May 2015

DOI: 10.1093/acprof:osobl/9780195370157.001.0001

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Soluble Organic Nutrient Fluxes

Soluble Organic Nutrient Fluxes

(p.85) 5 Soluble Organic Nutrient Fluxes
Long-Term Response of a Forest Watershed Ecosystem

Robert G. Qualls

Bruce L. Haines

Wayne T. Swank

Oxford University Press

This chapter aims to (i) compare fluxes of dissolved organic carbon (DOC), dissolved organic nitrogen (DON), and dissolved organic phosphorus (DOP) in a clearcut area and an adjacent mature reference area; (ii) determine whether concentrations of dissolved organic nutrients or inorganic nutrients were greater in clearcut areas than in reference areas; and (iii) identify the strata where the greatest net leaching and deposition occur. It shows that fluxes of DOC, DON, and DOP in all strata were greater in cut plots than in uncut plots. In the cut plots, fluxes of the organic forms of nutrients exceeded those of the inorganic forms. It is hypothesized that the well-recognized retention mechanisms for inorganic nutrients (e.g. uptake by the roots of stump sprouts, adsorption of ions, and immobilization) combined with geochemical adsorption of dissolved organic matter, efficiently buffer against the leaching of either soluble inorganic or organic nutrients after clearcutting.

Keywords:   dissolved organic nitrogen, streamwater draining, forest watersheds, nutrient transport, clearcutting, dissolved organic carbon, organic nutrients, dissolved organic phosphorus

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