Measurement and prediction of nitrogen loss by simulated erosion events on cultivated forest soils of contrasting structure

Teixeira, P. C. and Misra, R. K. (2005) Measurement and prediction of nitrogen loss by simulated erosion events on cultivated forest soils of contrasting structure. Soil and Tillage Research, 83 (2). pp. 204-217. ISSN 0167-1987

Abstract

The objectives of this study were to determine nitrogen (N) loss associated with erosion of forest soils and to explore the role of soil structure and other factors governing N enrichment of sediment to aid prediction of N loss. We measured erosion, size distribution of aggregates in the sediment and N distribution in various aggregate fractions using simulated rainfall on samples of three cultivated forest soils of contrasting structure (repacked in trays) exposed to four erosion conditions. Both sediment loss and N loss increased with slope and kinetic energy of rainfall suggesting greater dependency of N loss on sediment loss than on N concentration in the sediment. Irrespective of erosion treatments and soil type, the bulk sediment and its size fractions were mostly richer in N than those of the uneroded soils. The enrichment ratio (ER) and concentration ratio (CR) of N for sediment cast some doubt on the application of raindrop stripping as a mechanism of N enrichment of sediment for soils of widely differing characteristics. Previously published models of N enrichment of sediment did not predict ER for our soils satisfactorily. However, an empirical model using published data on erosion and N loss agreed well with the results. This predictive method only requires information on sediment loss that can be easily obtained from an erosion model.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Copyright 2005 Elsevier: Reproduced in accordance with the copyright policy of the publisher.This is the author-version of the work. It is posted here for your personal use. Use the hypertext links above to access the journal's website.
Depositing User: epEditor USQ
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 11 Oct 2007 00:20
Last Modified: 02 Jul 2013 22:32
Uncontrolled Keywords: enrichment ratio; erosion; forest soils; nitrogen loss; soil structure
Fields of Research (FOR2008): 04 Earth Sciences > 0402 Geochemistry > 040202 Inorganic Geochemistry
05 Environmental Sciences > 0503 Soil Sciences > 050304 Soil Chemistry (excl. Carbon Sequestration Science)
07 Agricultural and Veterinary Sciences > 0705 Forestry Sciences > 070501 Agroforestry
Socio-Economic Objective (SEO2008): D Environment > 96 Environment > 9614 Soils > 961403 Forest and Woodlands Soils
Identification Number or DOI: doi: 10.1016/j.still.2004.07.014
URI: http://eprints.usq.edu.au/id/eprint/390

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