Effect of Carbon source on dissimilatory nitrate reduction to ammonium in Costal Wetland sediments

15N tracing technique was applied to investigate the effects of various organic carbon (OC) sources on dissimilatory nitrate (NO3-)reduction to ammonium (NH4+) (DNRA) rates in the coastal wetland sediments. Soils collected from the Chongming Dongtan wetland were incubated at 25ºC in the dark for 24...

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Autores principales:	Liu,X, Han,J.-G, Ma,Z.-W, Wang,Q, Li,L.-H
Lenguaje:	English
Publicado:	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo 2016
Materias:	Dissimilatory nitrate reduction to ammonium Carbon source 15N tracing technique organic acid coastal wetland
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162016000200006
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spelling	oai:scielo:S0718-951620160002000062016-10-24Effect of Carbon source on dissimilatory nitrate reduction to ammonium in Costal Wetland sedimentsLiu,XHan,J.-GMa,Z.-WWang,QLi,L.-H Dissimilatory nitrate reduction to ammonium Carbon source 15N tracing technique organic acid coastal wetland 15N tracing technique was applied to investigate the effects of various organic carbon (OC) sources on dissimilatory nitrate (NO3-)reduction to ammonium (NH4+) (DNRA) rates in the coastal wetland sediments. Soils collected from the Chongming Dongtan wetland were incubated at 25ºC in the dark for 24 h following the additions of OC sources (glucose, acetate, malate, citrate and oxalate (500 μg C g-1 dry soil)) and 15N-labeled NH4(15)NO3 (initial 15N atom% of NO3--N is 20%). The results showed that soil DNRA rates varied from 0.018-0.497 mg N kg-1 dry soil d-1during the whole incubation, and the rates differed significantly among treatments following the order: oxalate> citrate> glucose> acetate> malate> no exogenous C addition over the first 12-h incubation. This was possibly caused by the different decomposition rates of various OC sources, which further influenced the available energy provided for DNRA microorganisms. Soils with no addition of exogenous C showed lower soil DNRA rates, presumably because of the low C/NO3- ratio as well as energy availability. The relative lower soil DNRA rates over the 24-h incubation indicated that DNRA is a fast process. Our results suggest that DNRA could be controlled by OC sources, especially organic acids, demonstrating that the widespread use of glucose in soil laboratory studies might lead to misleading knowledge on understanding the effects of OC on soil DNRA process.info:eu-repo/semantics/openAccessChilean Society of Soil Science / Sociedad Chilena de la Ciencia del SueloJournal of soil science and plant nutrition v.16 n.2 20162016-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162016000200006en10.4067/S0718-95162016005000029
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Dissimilatory nitrate reduction to ammonium Carbon source 15N tracing technique organic acid coastal wetland
spellingShingle	Dissimilatory nitrate reduction to ammonium Carbon source 15N tracing technique organic acid coastal wetland Liu,X Han,J.-G Ma,Z.-W Wang,Q Li,L.-H Effect of Carbon source on dissimilatory nitrate reduction to ammonium in Costal Wetland sediments
description	15N tracing technique was applied to investigate the effects of various organic carbon (OC) sources on dissimilatory nitrate (NO3-)reduction to ammonium (NH4+) (DNRA) rates in the coastal wetland sediments. Soils collected from the Chongming Dongtan wetland were incubated at 25ºC in the dark for 24 h following the additions of OC sources (glucose, acetate, malate, citrate and oxalate (500 μg C g-1 dry soil)) and 15N-labeled NH4(15)NO3 (initial 15N atom% of NO3--N is 20%). The results showed that soil DNRA rates varied from 0.018-0.497 mg N kg-1 dry soil d-1during the whole incubation, and the rates differed significantly among treatments following the order: oxalate> citrate> glucose> acetate> malate> no exogenous C addition over the first 12-h incubation. This was possibly caused by the different decomposition rates of various OC sources, which further influenced the available energy provided for DNRA microorganisms. Soils with no addition of exogenous C showed lower soil DNRA rates, presumably because of the low C/NO3- ratio as well as energy availability. The relative lower soil DNRA rates over the 24-h incubation indicated that DNRA is a fast process. Our results suggest that DNRA could be controlled by OC sources, especially organic acids, demonstrating that the widespread use of glucose in soil laboratory studies might lead to misleading knowledge on understanding the effects of OC on soil DNRA process.
author	Liu,X Han,J.-G Ma,Z.-W Wang,Q Li,L.-H
author_facet	Liu,X Han,J.-G Ma,Z.-W Wang,Q Li,L.-H
author_sort	Liu,X
title	Effect of Carbon source on dissimilatory nitrate reduction to ammonium in Costal Wetland sediments
title_short	Effect of Carbon source on dissimilatory nitrate reduction to ammonium in Costal Wetland sediments
title_full	Effect of Carbon source on dissimilatory nitrate reduction to ammonium in Costal Wetland sediments
title_fullStr	Effect of Carbon source on dissimilatory nitrate reduction to ammonium in Costal Wetland sediments
title_full_unstemmed	Effect of Carbon source on dissimilatory nitrate reduction to ammonium in Costal Wetland sediments
title_sort	effect of carbon source on dissimilatory nitrate reduction to ammonium in costal wetland sediments
publisher	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo
publishDate	2016
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162016000200006
work_keys_str_mv	AT liux effectofcarbonsourceondissimilatorynitratereductiontoammoniumincostalwetlandsediments AT hanjg effectofcarbonsourceondissimilatorynitratereductiontoammoniumincostalwetlandsediments AT mazw effectofcarbonsourceondissimilatorynitratereductiontoammoniumincostalwetlandsediments AT wangq effectofcarbonsourceondissimilatorynitratereductiontoammoniumincostalwetlandsediments AT lilh effectofcarbonsourceondissimilatorynitratereductiontoammoniumincostalwetlandsediments
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Effect of Carbon source on dissimilatory nitrate reduction to ammonium in Costal Wetland sediments

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