Effects of ammonium and nitrate additions on carbon mineralization in wetland soils

Kyungjin Min, Hojeong Kang, Dowon Lee

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

Wetlands have been recognized as a soil carbon (C) sink due to low decomposition. As decomposition is largely controlled by the availability of soil nitrogen (N), an elevated anthropogenic N input could influence the C balance in wetlands. However, the effects of the form of N on decomposition are poorly understood. Here, a 54-day laboratory incubation experiment was conducted, with a diel cycle (day: 22 °C for 13 h; night: 17 °C for 11 h) in order to determine how the dominant N form influences the mineralization of soil C in two adjacent wetland soils, with distinct physicochemical characteristics. Three combinations of N compounds were added at three different rates (0, 30, 60 kg N ha-1 yr-1): Ammonium dominant (NH4Cl + NH4NO3); nitrate dominant (NH4NO3 + NaNO3); and ammonium nitrate treatments (NH4NO3). In the acidic soil, the CO2 efflux was reduced with N additions, especially with NH4NO3 treatment. In addition, decreases in the microbial enzyme activities (β-glucosidase, N-acetyl-glucosaminidase, phosphatase, and phenol oxidase) and soil pH were observed with NH4NO3 and NH4+-dominant treatment. Under alkaline conditions, marginal changes in response to N additions were observed in the soil CO2 efflux, extractable DOC, simple substrate utilization, enzyme activities and pH. A regression analysis revealed that the changes in pH and enzyme activities after fertilization significantly influenced the soil CO2 efflux. Our findings suggest that the form of N additions could influence the rate of C cycling in wetland soils via biological (enzyme activities) and chemical (pH) changes.

Original languageEnglish
Pages (from-to)2461-2469
Number of pages9
JournalSoil Biology and Biochemistry
Volume43
Issue number12
DOIs
Publication statusPublished - 2011 Dec 1

Fingerprint

wetland soils
Wetlands
ammonium nitrate
mineralization
Soil
Carbon
ammonium
wetland
nitrates
nitrate
carbon
enzyme activity
soil
decomposition
degradation
wetlands
Enzymes
glucosidases
monophenol monooxygenase
Carbon Sequestration

All Science Journal Classification (ASJC) codes

  • Microbiology
  • Soil Science

Cite this

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abstract = "Wetlands have been recognized as a soil carbon (C) sink due to low decomposition. As decomposition is largely controlled by the availability of soil nitrogen (N), an elevated anthropogenic N input could influence the C balance in wetlands. However, the effects of the form of N on decomposition are poorly understood. Here, a 54-day laboratory incubation experiment was conducted, with a diel cycle (day: 22 °C for 13 h; night: 17 °C for 11 h) in order to determine how the dominant N form influences the mineralization of soil C in two adjacent wetland soils, with distinct physicochemical characteristics. Three combinations of N compounds were added at three different rates (0, 30, 60 kg N ha-1 yr-1): Ammonium dominant (NH4Cl + NH4NO3); nitrate dominant (NH4NO3 + NaNO3); and ammonium nitrate treatments (NH4NO3). In the acidic soil, the CO2 efflux was reduced with N additions, especially with NH4NO3 treatment. In addition, decreases in the microbial enzyme activities (β-glucosidase, N-acetyl-glucosaminidase, phosphatase, and phenol oxidase) and soil pH were observed with NH4NO3 and NH4+-dominant treatment. Under alkaline conditions, marginal changes in response to N additions were observed in the soil CO2 efflux, extractable DOC, simple substrate utilization, enzyme activities and pH. A regression analysis revealed that the changes in pH and enzyme activities after fertilization significantly influenced the soil CO2 efflux. Our findings suggest that the form of N additions could influence the rate of C cycling in wetland soils via biological (enzyme activities) and chemical (pH) changes.",
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Effects of ammonium and nitrate additions on carbon mineralization in wetland soils. / Min, Kyungjin; Kang, Hojeong; Lee, Dowon.

In: Soil Biology and Biochemistry, Vol. 43, No. 12, 01.12.2011, p. 2461-2469.

Research output: Contribution to journalArticle

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