Transformation and fate of nitrate near the sediment-water interface of Copano Bay

Lijun Hou; Min Liu; Stephen A. Carini; Wayne S. Gardner

doi:10.1016/j.csr.2012.01.004

Transformation and fate of nitrate near the sediment-water interface of Copano Bay

Lijun Hou, Min Liu, Stephen A. Carini, Wayne S. Gardner

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118 Scopus citations

Abstract

This study investigated potential transformation processes and fates of nitrate at the sediment-water interface of Copano Bay during a period of drought by conducting continuous-flow and slurry experiments combined with a ¹⁵NO ₃ ^- addition technique. Rates of ¹⁵NO ₃ ^--based denitrification, anaerobic ammonium oxidation (ANAMMOX) and potential dissimilatory nitrate reduction to ammonium (DNRA) were in the range of 27.7-40.1, 0.26-1.6 and 1.4-3.8μmol ¹⁵Nm ^-2h ^-1, respectively. Compared with the total ¹⁵NO ₃ ^-fluxes into sediments, dissimilatory processes contributed 29-49% to loss of the spiked ¹⁵NO ₃ ^-. Based on the mass balance of ¹⁵NO ₃ ^-, microbial assimilation was estimated to consume about 50-70% of the added ¹⁵NO ₃ ^-, indicating that most of nitrate was incorporated by microorganisms in this N-limiting system. In addition, significant correlations of nitrate transformation rates with sediment characteristics reflect that the depth related behaviors of nitrate transformations in core sediments were coupled strongly to organic matter, iron (Fe) and sulfur (S) cycles.

Original language	English
Pages (from-to)	86-94
Number of pages	9
Journal	Continental Shelf Research
Volume	35
DOIs	https://doi.org/10.1016/j.csr.2012.01.004
State	Published - 1 Mar 2012

Keywords

ANAMMOX
Assimilation
Copano Bay
DNRA
Denitrification
Nitrogen

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10.1016/j.csr.2012.01.004

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@article{7323d75af66a4bc18390cd4705934949,

title = "Transformation and fate of nitrate near the sediment-water interface of Copano Bay",

abstract = "This study investigated potential transformation processes and fates of nitrate at the sediment-water interface of Copano Bay during a period of drought by conducting continuous-flow and slurry experiments combined with a 15NO 3 - addition technique. Rates of 15NO 3 --based denitrification, anaerobic ammonium oxidation (ANAMMOX) and potential dissimilatory nitrate reduction to ammonium (DNRA) were in the range of 27.7-40.1, 0.26-1.6 and 1.4-3.8μmol 15Nm -2h -1, respectively. Compared with the total 15NO 3 -fluxes into sediments, dissimilatory processes contributed 29-49\% to loss of the spiked 15NO 3 -. Based on the mass balance of 15NO 3 -, microbial assimilation was estimated to consume about 50-70\% of the added 15NO 3 -, indicating that most of nitrate was incorporated by microorganisms in this N-limiting system. In addition, significant correlations of nitrate transformation rates with sediment characteristics reflect that the depth related behaviors of nitrate transformations in core sediments were coupled strongly to organic matter, iron (Fe) and sulfur (S) cycles.",

keywords = "ANAMMOX, Assimilation, Copano Bay, DNRA, Denitrification, Nitrogen",

author = "Lijun Hou and Min Liu and Carini, \{Stephen A.\} and Gardner, \{Wayne S.\}",

year = "2012",

month = mar,

day = "1",

doi = "10.1016/j.csr.2012.01.004",

language = "英语",

volume = "35",

pages = "86--94",

journal = "Continental Shelf Research",

issn = "0278-4343",

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TY - JOUR

T1 - Transformation and fate of nitrate near the sediment-water interface of Copano Bay

AU - Hou, Lijun

AU - Liu, Min

AU - Carini, Stephen A.

AU - Gardner, Wayne S.

PY - 2012/3/1

Y1 - 2012/3/1

N2 - This study investigated potential transformation processes and fates of nitrate at the sediment-water interface of Copano Bay during a period of drought by conducting continuous-flow and slurry experiments combined with a 15NO 3 - addition technique. Rates of 15NO 3 --based denitrification, anaerobic ammonium oxidation (ANAMMOX) and potential dissimilatory nitrate reduction to ammonium (DNRA) were in the range of 27.7-40.1, 0.26-1.6 and 1.4-3.8μmol 15Nm -2h -1, respectively. Compared with the total 15NO 3 -fluxes into sediments, dissimilatory processes contributed 29-49% to loss of the spiked 15NO 3 -. Based on the mass balance of 15NO 3 -, microbial assimilation was estimated to consume about 50-70% of the added 15NO 3 -, indicating that most of nitrate was incorporated by microorganisms in this N-limiting system. In addition, significant correlations of nitrate transformation rates with sediment characteristics reflect that the depth related behaviors of nitrate transformations in core sediments were coupled strongly to organic matter, iron (Fe) and sulfur (S) cycles.

AB - This study investigated potential transformation processes and fates of nitrate at the sediment-water interface of Copano Bay during a period of drought by conducting continuous-flow and slurry experiments combined with a 15NO 3 - addition technique. Rates of 15NO 3 --based denitrification, anaerobic ammonium oxidation (ANAMMOX) and potential dissimilatory nitrate reduction to ammonium (DNRA) were in the range of 27.7-40.1, 0.26-1.6 and 1.4-3.8μmol 15Nm -2h -1, respectively. Compared with the total 15NO 3 -fluxes into sediments, dissimilatory processes contributed 29-49% to loss of the spiked 15NO 3 -. Based on the mass balance of 15NO 3 -, microbial assimilation was estimated to consume about 50-70% of the added 15NO 3 -, indicating that most of nitrate was incorporated by microorganisms in this N-limiting system. In addition, significant correlations of nitrate transformation rates with sediment characteristics reflect that the depth related behaviors of nitrate transformations in core sediments were coupled strongly to organic matter, iron (Fe) and sulfur (S) cycles.

KW - ANAMMOX

KW - Assimilation

KW - Copano Bay

KW - DNRA

KW - Denitrification

KW - Nitrogen

UR - https://www.scopus.com/pages/publications/84856804826

U2 - 10.1016/j.csr.2012.01.004

DO - 10.1016/j.csr.2012.01.004

M3 - 文章

AN - SCOPUS:84856804826

SN - 0278-4343

VL - 35

SP - 86

EP - 94

JO - Continental Shelf Research

JF - Continental Shelf Research

ER -

Transformation and fate of nitrate near the sediment-water interface of Copano Bay

Abstract

Keywords

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