Denitrification response to nitrate concentrations in sandy soils

Strong, D. T.; Fillery, I. R. P.

doi:10.1016/s0038-0717(02)00026-3

Cited by 67 publications

(40 citation statements)

References 21 publications

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“…Increased N 2 O emissions with increasing soil NO 3 ( concentrations in exp. 1 are consistent with previous studies which concluded that NO 3 ( acts as a preferred TEA relative to N 2 O (Jo et al 1985;Strong and Fillery 2002). Soil NO 3 ( concentrations measured at the end of the incubation for the treatment without NO 3 ( addition were B2 mg N kg…”

Section: Discussionsupporting

confidence: 90%

“…In addition, there was no interaction between C and NO 3 ( addition on denitrification. Previous studies reported an increase in denitrification rate with increasing NO 3 ( addition (Jordan et al 1998;Strong and Fillery 2002), whereas others measured no significant effect of NO 3 ( addition on denitrification (Myrold and Tiedje 1985;De Klein and Van Logtestijn 1996). Jordan et al (1998) and Strong and Fillery (2002) observed an effect of NO 3 ( addition where soil NO ( 3 concentrations were very low (0Á15 mg N kg…”

Section: Discussionmentioning

confidence: 87%

“…Increased soil NO 3 ( concentrations can result in increased denitrification and N 2 O emissions (Smith et al 1998). However, while denitrification may be NO 3 ( limited in some cases (Jordan et al 1998;Strong and Fillery 2002), other studies have reported no significant effect of NO 3 ( addition on denitrification (Blackmer and Bremner 1978;De Klein and Van Logtestijn 1996). Denitrification has been reported to be limited by NO 3 ( when concentrations are lower than 5Á10 mg N kg…”

mentioning

confidence: 99%

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Nitrous oxide emissions from denitrification and the partitioning of gaseous losses as affected by nitrate and carbon addition and soil aeration

Gillam¹,

Zebarth²,

Burton³

2008

Can. J. Soil. Sci.

137

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. 2008. Nitrous oxide emissions from denitrification and the partitioning of gaseous losses as affected by nitrate and carbon addition and soil aeration. Can. J. Soil Sci. 88: 133Á143. National inventories of N 2 O emissions from agricultural situations are being developed; however, the factors controlling such emissions may vary with soil and environmental conditions and management practices. This study determined the relative importance of soil aeration, as measured by water-filled pore space (WFPS), NO , N 2 O emissions and denitrification were low and were increased by both NO ( 3 and C addition treatments. Carbon source was investigated by amendment with glucose, red clover or barley straw. Based on the quantity of soil respiration per unit of C added in the amendment, C in the red clover and barley straw was estimated to be 48 and 28% as available as glucose C. When corrected for C availability, cumulative N 2 O emissions averaged 0.010, 0.011 and 0.002 mg N kg(1 soil, and cumulative denitrification averaged 0.014, 0.014 and 0.003 mg N kg (1 soil, for each 1.0 mg C kg (1 soil of available C added as glucose, red clover or barley straw, respectively. NO ( 3 addition had no effect on denitrification, but increased N 2 O emissions, especially where C availability was high. The amount of denitrification was controlled primarily by soil O 2 supply, as controlled by WFPS and C availability. The N 2 O:(N 2 O'N 2 ) ratio was generally high in cases where the supply of O 2 or NO 3 Á was sufficient to meet the demand for terminal electron acceptors. For personal use only.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 87%

mentioning

confidence: 99%

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Nitrous oxide emissions from denitrification and the partitioning of gaseous losses as affected by nitrate and carbon addition and soil aeration

Gillam¹,

Zebarth²,

Burton³

2008

Can. J. Soil. Sci.

137

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“…Apparent K M values for both nitrate and nitrite were in the same range or lower than in other more neutral soil types or pure cultures (Betlach and Tiedje, 1981;Strong and Fillery, 2002;Palmer et al, 2010), supporting the conclusion that peat denitrifiers cope well with low pH.…”

Section: Discussionsupporting

confidence: 62%

Contrasting denitrifier communities relate to contrasting N2O emission patterns from acidic peat soils in arctic tundra

2011

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Cryoturbated peat circles (that is, bare surface soil mixed by frost action; pH 3-4) in the Russian discontinuous permafrost tundra are nitrate-rich 'hotspots' of nitrous oxide (N 2 O) emissions in arctic ecosystems, whereas adjacent unturbated peat areas are not. N 2 O was produced and subsequently consumed at pH 4 in unsupplemented anoxic microcosms with cryoturbated but not in those with unturbated peat soil. Nitrate, nitrite and acetylene stimulated net N 2 O production of both soils in anoxic microcosms, indicating denitrification as the source of N 2 O. Up to 500 and 10 lM nitrate stimulated denitrification in cryoturbated and unturbated peat soils, respectively. Apparent maximal reaction velocities of nitrite-dependent denitrification were 28 and 18 nmol N 2 O g DW À1 h À1 , for cryoturbated and unturbated peat soils, respectively. Barcoded amplicon pyrosequencing of narG, nirK/nirS and nosZ (encoding nitrate, nitrite and N 2 O reductases, respectively) yielded E49 000 quality-filtered sequences with an average sequence length of 444 bp. Up to 19 species-level operational taxonomic units were detected per soil and gene, many of which were distantly related to cultured denitrifiers or environmental sequences. Denitrification-associated gene diversity in cryoturbated and in unturbated peat soils differed. Quantitative PCR (inhibition-corrected per DNA extract) revealed higher copy numbers of narG in cryoturbated than in unturbated peat soil. Copy numbers of nirS were up to 1000 Â higher than those of nirK in both soils, and nirS nirK À1 copy number ratios in cryoturbated and unturbated peat soils differed. The collective data indicate that the contrasting N 2 O emission patterns of cryoturbated and unturbated peat soils are associated with contrasting denitrifier communities.

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“…Indeed, soil water content controls air diffusion, which in turn, along with aerobic respiratory activity, determines the soil oxygen content [17,53,54]. Low water content may also limit denitrification process because of higher redox potential and nitrate diffusion [51,54].…”

Section: Resultsmentioning

confidence: 99%

Frequency and Diversity of Nitrate Reductase Genes among Nitrate-Dissimilating Pseudomonas in the Rhizosphere of Perennial Grasses Grown in Field Conditions

et al. 2005

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A total of 1246 Pseudomonas strains were isolated from the rhizosphere of two perennial grasses (Lolium perenne and Molinia coerulea) with different nitrogen requirements. The plants were grown in their native soil under ambient and elevated atmospheric CO 2 content (pCO 2 ) at the Swiss FACE (Free Air CO 2 Enrichment) facility. Root-, rhizosphere-, and non-rhizospheric soil-associated strains were characterized in terms of their ability to reduce nitrate during an in vitro assay and with respect to the genes encoding the membrane-bound (named NAR) and periplasmic (NAP) nitrate reductases so far described in the genus Pseudomonas. The diversity of corresponding genes was assessed by PCR-RFLP on narG and napA genes, which encode the catalytic subunit of nitrate reductases. The frequency of nitrate-dissimilating strains decreased with root proximity for both plants and was enhanced under elevated pCO 2 in the rhizosphere of L. perenne. NAR (54% of strains) as well as NAP (49%) forms were present in nitrate-reducing strains, 15.5% of the 439 strains tested harbouring both genes. The relative proportions of narG and napA detected in Pseudomonas strains were different according to root proximity and for both pCO 2 treatments: the NAR form was more abundant close to the root surface and for plants grown under elevated pCO 2 . Putative denitrifiers harbored mainly the membrane-bound (NAR) form of nitrate reductase. Finally, both narG and napA sequences displayed a high level of diversity. Anyway, this diversity was correlated neither with the root proximity nor with the pCO 2 treatment.

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Denitrification response to nitrate concentrations in sandy soils

Cited by 67 publications

References 21 publications

Nitrous oxide emissions from denitrification and the partitioning of gaseous losses as affected by nitrate and carbon addition and soil aeration

Nitrous oxide emissions from denitrification and the partitioning of gaseous losses as affected by nitrate and carbon addition and soil aeration

Contrasting denitrifier communities relate to contrasting N2O emission patterns from acidic peat soils in arctic tundra

Frequency and Diversity of Nitrate Reductase Genes among Nitrate-Dissimilating Pseudomonas in the Rhizosphere of Perennial Grasses Grown in Field Conditions

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