Denitrification prevails over anammox in tropical mangrove sediments (Goa, India)

Fernandes, Sheryl Oliveira; Michotey, Valérie; Guasco, Sophie; Bonin, Patricia; Bharathi, P. A. Loka

doi:10.1016/j.marenvres.2011.11.008

Cited by 91 publications

(52 citation statements)

References 71 publications

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“…Despite these findings suggesting the functional importance of anammox, the contributions to N 2 production from denitrification were approximately 10e150 times of that from anammox in the BH and LZ columns, and denitrification was responsible for all N 2 emission in the TY column and field-fresh soil. Similar trends are also observed in other paddy soils (Zhu et al, 2011b;Yang et al, 2015), freshwater sediments (Zhu et al, 2011a(Zhu et al, , 2013Wang et al, 2012a) and mangrove sediments (Fernandes et al, 2012), suggesting a more dominant contribution of denitrification than anammox to N 2 production in terrestrial ecosystems. In contrast, the contribution of anammox to N 2 production was reported to exceed denitrification in marine ecosystems (Thamdrup and Dalsgaard, 2002;Engstr€ om et al, 2005).…”

Section: Anammox and Denitrification Activity In The Three Paddy Soilssupporting

confidence: 79%

Activity, abundance and community structure of anammox bacteria along depth profiles in three different paddy soils

Bai

et al. 2015

Soil Biology and Biochemistry

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a b s t r a c tAnaerobic ammonium oxidation (anammox) is a globally important nitrogen-cycling process mediated by specialized microbes, and has been demonstrated to be ubiquitous in anoxic natural settings and bioreactors. However, our knowledge of its prevalence in different paddy soil types and along the depth profiles remains largely undocumented. Here, mesocosm incubations were constructed to investigate the activity and community compositions of anammox bacteria across different depth layers of three different paddy soils. 15N tracer experiments showed that anammox rates were prevalent in almost all depth layers of an inceptisol (Binhai, BH) and an oxisol (Leizhou, LZ), but was absent in an ultisol (Taoyuan, TY). The functional gene hzsB of anammox bacteria was only detected in BH and LZ soil profiles with detected anammox activity. Anammox accounted for 0.4%e12.2% of the total N 2 production, and anammox rates were 0.02e0.77 nmol N g À1 dry soil h À1 and significantly correlated with soil pH and electric conductivity. Anammox activity and abundance of hzsB genes were significantly lower in the surface soil layers (0e5 cm) than in the sub-surface soil layers (20e60 cm). Candidatus Brocadia, Candidatus Kuenenia and Candidatus Jettenia were detected by cloning and sequencing, with Candidatus Brocadia being dominant in all the three soils and Candidatus Jettenia being more frequently detected in the LZ soil. The operational taxonomic unit number and diversity indices of anammox bacterial 16S rRNA gene increased with soil depth. Our results demonstrate that anammox is more common and active in alkaline soils than in acidic soils, in deep paddy soil layers than in surface soil layers, and that anammox activities are likely to be regulated by soil chemical properties such as pH, salinity and redox potential.

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Section: Anammox and Denitrification Activity In The Three Paddy Soilssupporting

confidence: 79%

Activity, abundance and community structure of anammox bacteria along depth profiles in three different paddy soils

Bai

et al. 2015

Soil Biology and Biochemistry

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“…The denitrifying community was quantified using nosZ gene with primers previously used for competitive PCR (Rontani et al 2010;Fernandes et al 2012). In qPCR, the efficiency of the reaction reached 91.7 %.…”

Section: Resultsmentioning

confidence: 99%

“…The impact of oil on denitrifying community was also addressed in this study. This community was enumerated with nosZ as validated earlier (Rontani et al 2010;Fernandes et al 2012;Nogales et al 2002). This gene was preferred to nirS since it presents the advantage to be the sole one coding for this enzymatic step.…”

Section: Discussionmentioning

confidence: 99%

Substrates specialization in lipid compounds and hydrocarbons of Marinobacter genus

Bonin

Vieira

Grimaud

et al. 2015

Environ Sci Pollut Res

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“…The fluxes from the Indian estuaries were much smaller (0.01%) compared to world estuaries (4.7 Tg N 2 O y (1 ). Mangroves are a strong source of trace gases to the atmosphere (Chauhan et al, 2008;Krithika et al, 2008;Fernandes et al, 2012). Mangroves are located close to several Indian estuaries.…”

Section: N 2 O Emissions From Indian Estuariesmentioning

confidence: 99%

“…With the exception of this report, no information is available from other Indian estuaries. Indian Mangroves, which are part of the estuarine system, are found to be a strong source of trace gases to the atmosphere (Chauhan et al, 2008;Krithika et al, 2008;Fernandes et al, 2012). The annual emission of N 2 O from the mangroves located along the east coast of India was estimated to be 5.8 )10 3 gN 2 O.…”

Section: Introductionmentioning

confidence: 99%

Contribution of N<sub>2</sub>O emissions to the atmosphere from Indian monsoonal estuaries

Gijjapu

Sarma

2013

Tellus B: Chemical and Physical Meteorology

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A B S T R A C T Estuaries are known to contribute a significant amount of nitrous oxide (N 2 O) to the atmosphere; however, the contribution from the Indian estuaries is unknown. We made an attempt to estimate emissions of N 2 O from the Indian estuaries by collecting samples from 28 major and minor estuaries along the Indian coast during the wet and dry periods. The N 2 O was mostly saturated in all measured Indian estuaries during the study period (72Á631%), with exceptionally high saturation in the Ponniyaar estuary (5902%) during the wet period. The N 2 O saturation displayed a strong relation with dissolved inorganic nitrogen (DIN; nitrate ' nitrite and ammonium), ammonium and dissolved oxygen saturation, suggesting that nitrification is the major source of N 2 O in the Indian estuaries. The negative relation between salinity and N 2 O saturation suggests inner estuaries are a strong source compared to outer estuaries. The annual mean N 2 O saturation (2049137%) and fluxes (1.3 mmol N 2 O m (2 d (1 ) in the Indian estuaries were significantly less than European estuaries (271% andThe estimation of flux of N 2 O from the European estuaries was also biased due to the inclusion of an exceptionally high supersaturation value from a small UK estuary, Colne (2645%). However, low N 2 O saturation and fluxes in the Indian estuaries were related to mean low concentration of DIN that led to low nitrification rates compared to world estuaries. Despite India ranking second in artificial fertilizers use, high flushing rates during the wet period reduce residence time leading to less modification within the estuary.

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Denitrification prevails over anammox in tropical mangrove sediments (Goa, India)

Cited by 91 publications

References 71 publications

Activity, abundance and community structure of anammox bacteria along depth profiles in three different paddy soils

Activity, abundance and community structure of anammox bacteria along depth profiles in three different paddy soils

Substrates specialization in lipid compounds and hydrocarbons of Marinobacter genus

Contribution of N<sub>2</sub>O emissions to the atmosphere from Indian monsoonal estuaries

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