Nitrate removal in a riparian wetland of the Appalachian Valley and Ridge physiographic province

O. P. Flite, Robert David Shannon, R. R. Schnabel, R. R. Parizek

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Riparian zones within the Appalachian Valley and Ridge physiographic province are often characterized by localized variability in soil moisture and organic carbon content, as well as variability in the distribution of soils formed from alluvial and colluvial processes. These sources of variability may significantly influence denitrification rates. This investigation studied the attenuation of nitrate (NO3/--N) as wastewater effluent flowed through the shallow ground water of a forested headwater riparian zone within the Appalachian Valley and Ridge physiographic province. Ground water flow and NO3/--N measurements indicated that NO3/--N discharged to the riparian zone preferentially flowed through the A and B horizons of depressional wetlands located in relic meander scars, with NO3/--N decreasing from >12 to <0.5 mg L-1. Denitrification enzyme activity (DEA) attributable to riparian zone location, soil horizon, and NO3/--N amendments was also determined. Mean DEA in saturated soils attained values as high as 210 μg N kg-1 h-1, and was significantly higher than in unsaturated soils, regardless of horizon (p < 0.001). Denitrification enzyme activity in the shallow A horizon of wetland soils was significantly higher (p < 0.001) than in deeper soils. Significant stimulation of DEA (p = 0.027) by NO3/--N amendments occurred only in the meander scar soils receiving low NO3/--N (<3.6 mg L-1) concentrations. Significant denitrificafion of high NO3/--N ground water can occur in riparian wetland soils, but DEA is dependent upon localized differences in the degree of soil saturation and organic carbon content.

Original languageEnglish (US)
Pages (from-to)254-261
Number of pages8
JournalJournal of Environmental Quality
Volume30
Issue number1
StatePublished - 2001

Fingerprint

Wetlands
Nitrates
Denitrification
wetland
nitrate
Soils
denitrification
valley
Enzyme activity
riparian zone
enzyme activity
soil
meander
Organic carbon
Groundwater
organic carbon
groundwater
province
removal
Groundwater flow

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Environmental Chemistry

Cite this

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title = "Nitrate removal in a riparian wetland of the Appalachian Valley and Ridge physiographic province",
abstract = "Riparian zones within the Appalachian Valley and Ridge physiographic province are often characterized by localized variability in soil moisture and organic carbon content, as well as variability in the distribution of soils formed from alluvial and colluvial processes. These sources of variability may significantly influence denitrification rates. This investigation studied the attenuation of nitrate (NO3/--N) as wastewater effluent flowed through the shallow ground water of a forested headwater riparian zone within the Appalachian Valley and Ridge physiographic province. Ground water flow and NO3/--N measurements indicated that NO3/--N discharged to the riparian zone preferentially flowed through the A and B horizons of depressional wetlands located in relic meander scars, with NO3/--N decreasing from >12 to <0.5 mg L-1. Denitrification enzyme activity (DEA) attributable to riparian zone location, soil horizon, and NO3/--N amendments was also determined. Mean DEA in saturated soils attained values as high as 210 μg N kg-1 h-1, and was significantly higher than in unsaturated soils, regardless of horizon (p < 0.001). Denitrification enzyme activity in the shallow A horizon of wetland soils was significantly higher (p < 0.001) than in deeper soils. Significant stimulation of DEA (p = 0.027) by NO3/--N amendments occurred only in the meander scar soils receiving low NO3/--N (<3.6 mg L-1) concentrations. Significant denitrificafion of high NO3/--N ground water can occur in riparian wetland soils, but DEA is dependent upon localized differences in the degree of soil saturation and organic carbon content.",
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Nitrate removal in a riparian wetland of the Appalachian Valley and Ridge physiographic province. / Flite, O. P.; Shannon, Robert David; Schnabel, R. R.; Parizek, R. R.

In: Journal of Environmental Quality, Vol. 30, No. 1, 2001, p. 254-261.

Research output: Contribution to journalArticle

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