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Effects of inorganic sulfur addition on fluxes of volatile sulfur compounds in Sphagnum peatlandsShort and long-term impacts of increased S deposition on fluxes of volatile S compounds (VSC's) from Sphagnum peatlands were investigated in an artificially acidified (sulfuric and nitric acids) poor fen (Mire 239) at the Experimental Lakes Area (ELA), Ontario, Canada. Additional experiments were conducted in a poor fen (Sallie's Fen) in Barrington, NH, USA. At Mire 239, emissions of VSC's were monitored, before and after acidification, at control (unacidified) and experimental sections within two major physiographic zones of the mire (oligotrophic and minerotrophic). The experimental segments of the mire received S amendments since 1983, in amounts equivalent to the annual S deposition in the highest polluted areas of Canada and U.S. Dimethyl sulfide (DMS) was the predominant VSC released from the mire and varied largely with time and space (i.e., from 2.5 to 127 nmol/m(sup -2)h(sup -1)). Sulfur addition did not affect DMS emissions in a period of hours to a few days, although it stimulated production of DMS and MSH in the anoxic surficial regions of the peat. DMS emissions in the experimental oligotrophic segment of the mire was approximately 3-fold greater than in the control oligotrophic segment, and approximately 10-fold greater than in the minerotrophic zones. These differences could be due to a combination of differences in types of vegetation, nutritional status, and S input. At Sallie's Fen, DMS fluxes were approximately 8 times higher from a Sphagnum site than from a bare peat site. Fluxes of VSC's were not significantly affected by sulfate amendments at both sites, while DMS and MSH concentrations increases greatly with time in the top 10 cm of the peat column. Our data indicated that although Sphagnum is not the direct source of DMS released from Sphagnum peatlands, it might play a role in regulating DMS emissions to the atmosphere.
Document ID
19940007989
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Demello, William Zamboni
(New Hampshire Univ. Durham, NH, United States)
Hines, Mark E.
(New Hampshire Univ. Durham, NH, United States)
Bayley, Suzanne E.
(Alberta Univ. Edmonton., United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1992
Publication Information
Publication: Terminal Decomposition and Gaseous Sulfur Release from Tidal Wetlands
Subject Category
Environment Pollution
Accession Number
94N12461
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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