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International Journal of Wildland Fire International Journal of Wildland Fire Society
Journal of the International Association of Wildland Fire
RESEARCH ARTICLE

Long-term watershed management is an effective strategy to reduce organic matter export and disinfection by-product precursors in source water

Hamed Majidzadeh https://orcid.org/0000-0002-7755-9262 A B * , Huan Chen https://orcid.org/0000-0001-9998-1205 A * , T. Adam Coates C * , Kuo-Pei Tsai https://orcid.org/0000-0003-2620-3861 A , Christopher I. Olivares https://orcid.org/0000-0001-6213-7158 D , Carl Trettin E , Habibullah Uzun F , Tanju Karanfil https://orcid.org/0000-0003-0986-5628 G and Alex T. Chow https://orcid.org/0000-0001-7441-8934 A G H
+ Author Affiliations
- Author Affiliations

A Biogeochemistry and Environmental Quality Research Group, Clemson University, 177 Hobcaw Road, Georgetown, SC 29440, USA.

B School of Arts and Sciences, Southern New Hampshire University, 2500 North River Road, Manchester, NH 03106, USA.

C Department of Forest Resources and Environmental Conservation, Virginia Polytechnic Institute and State University, 228F Cheatham Hall, 310 West Campus Drive, Blacksburg, VA 24061, USA.

D Department of Civil and Environmental Engineering, University of California, Berkeley, 209 O’Brien Hall, Berkeley, CA 94720, USA.

E Center for Forested Wetland Research, USDA Forest Service, 3734 Highway 402, Cordesville, SC 29434, USA.

F Department of Environmental Engineering, Marmara University, Egitim Mahallesi, Fahrettin Keri Gokay Caddesi, 34772 Kadikoy, Istanbul, Turkey.

G Department of Environmental Engineering and Earth Science, Clemson University, 230 Kappa Street, Clemson, SC 29634, USA.

H Corresponding author. Email: achow@clemson.edu

International Journal of Wildland Fire 28(10) 804-813 https://doi.org/10.1071/WF18174
Submitted: 4 October 2018  Accepted: 2 August 2019   Published: 18 September 2019

Abstract

Watershed management practices such as prescribed fire, harvesting and understory mastication can alter the chemical composition and thickness of forest detritus, thus affecting the quantity and quality of riverine dissolved organic matter (DOM). Long-term effects of watershed management on DOM composition were examined through parallel field and extraction-based laboratory studies. The laboratory study was conducted using detritus samples collected from a pair of managed and unmanaged watersheds in South Carolina, USA. Results showed that dissolved organic carbon (DOC), total dissolved nitrogen (TDN) and ammonium (NH4+-N) concentrations were higher in water extracts from the unmanaged watershed than from the managed watershed (P < 0.01). Pyrolysis gas chromatography–mass spectrometry analysis showed that water extracts from the unmanaged watershed contained more aromatic compounds than extracts from the managed watershed. For the field study, monthly water samples were collected for 1 year (2015) from the paired watersheds. DOC and TDN concentrations, as well as DOM aromaticity, were significantly higher in the unmanaged watershed than in the managed watershed for most of the year (P < 0.05) and were linked to detrital thickness, precipitation and flow patterns. The formation potential of two regulated disinfection by-products was lower in the unmanaged watershed for most of 2015 (P < 0.05). From this study, it appears that long-term watershed management practices may alter detrital mass and chemistry in ways that improve water quality.

Additional keywords: carbon, forest management, fuels, harvesting, mastication, prescribed fire, water quality.


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