Plant and soil effects on denitrification potential in agricultural soils

Malique, François; Ke, Piaopiao; Boettcher, Jürgen; Dannenmann, Michael; Butterbach‐Bahl, Klaus

doi:10.1007/s11104-019-04038-5

Cited by 48 publications

(42 citation statements)

References 50 publications

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“…In those studies, conducted under anoxic conditions with unlimited NO 3 − supply, higher C availability in rhizosphere soil samples led to higher emissions of N 2 O and N 2 . However, when separation of bulk soil and rhizosphere was not well-defined due to densely rooted soil in pots, no differences in potential denitrification were found (Malique et al 2019). In the few studies with growing plants, higher denitrification rates were measured during the first weeks after emergence (Senbayram et al 2020), with poorly growing plants (von Rheinbaben and Trolldenier 1984), or when root biomass was decreasing (Haider et al 1987).…”

Section: Effect Of Root-derived C On N Emissionsmentioning

confidence: 95%

“…One of the core hypotheses of this study was that availability of root-derived C is a key driver of denitrification in planted soils. It was based on a number of studies reporting higher denitrification activity in rhizosphere compared to bulk soil which was explained by higher soil C (Hamonts et al 2013;Klemedtsson et al 1987;Malique et al 2019 ;Smith and Tiedje 1979). Detectable rhizodeposition and C flow into belowground respiration result from C translocation from shoots to roots (Remus and Augustin 2016).…”

Section: Effect Of Root-derived C On N Emissionsmentioning

confidence: 99%

“…However, we could not detect any relationship between total or pool-derived N fluxes and total CO 2 efflux or root-derived C and cumulative N emissions or the ratio of gaseous products. Most previous studies investigating plant effects on denitrification did not measure N 2 O and N 2 emissions under growing plants, but either potential denitrification (Klemedtsson et al 1987;Malique et al 2019;Smith and Tiedje 1979) or denitrification capacity (Hamonts et al 2013) from soil samples taken from rhizosphere and/or bulk soil. In those studies, conducted under anoxic conditions with unlimited NO 3 − supply, higher C availability in rhizosphere soil samples led to higher emissions of N 2 O and N 2 .…”

Section: Effect Of Root-derived C On N Emissionsmentioning

confidence: 99%

“…Higher denitrification rates were measured from planted compared to bare soil (Senbayram et al 2020;Vinther 1984). Some studies showed a strong influence of roots (Philippot et al 2009), increasing denitrification rates with increasing root biomass (Klemedtsson et al 1987), and higher potential denitrification activity in rhizosphere soil compared to bulk soil (Hamonts et al 2013;Malique et al 2019). Higher denitrification rates in planted soils have been associated with higher C org availability in the rhizosphere (Bakken 1988;Philippot et al 2009).…”

Section: Introductionmentioning

confidence: 99%

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Nitrate uptake and carbon exudation – do plant roots stimulate or inhibit denitrification?

et al. 2020

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Background and aims Plant growth affects soil moisture, mineral N and organic C availability in soil, all of which influence denitrification. With increasing plant growth, root exudation may stimulate denitrification, while N uptake restricts nitrate availability. Methods We conducted a double labeling pot experiment with either maize (Zea mays L.) or cup plant (Silphium perfoliatum L.) of the same age but differing in size of their shoot and root systems. The 15N gas flux method was applied to directly quantify N2O and N2 fluxes in situ. To link denitrification with available C in the rhizosphere, 13CO2 pulse labeling was used to trace C translocation from shoots to roots and its release by roots into the soil. Results Plant water and N uptake were the main factors controlling daily N2O + N2 fluxes, cumulative N emissions, and N2O production pathways. Accordingly, pool-derived N2O + N2 emissions were 30–40 times higher in the treatment with highest soil NO3− content and highest soil moisture. CO2 efflux from soil was positively correlated with root dry matter, but we could not detect any relationship between root-derived C and N2O + N2 emissions. Conclusions Root-derived C may stimulate denitrification under small plants, while N and water uptake become the controlling factors with increasing plant and root growth.

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Section: Effect Of Root-derived C On N Emissionsmentioning

confidence: 95%

Section: Effect Of Root-derived C On N Emissionsmentioning

confidence: 99%

Section: Effect Of Root-derived C On N Emissionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nitrate uptake and carbon exudation – do plant roots stimulate or inhibit denitrification?

et al. 2020

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“…Many advantages of the use of this technology had improved water quality worldwide as a cost effective and low maintenance alternative (Vymazal, 2011). Yet, quantification of denitrification in natural wetlands is much more complex, and straightforward identification of conditions and variables affecting the process are still developing (Han et al, 2017;Malique et al, 2019).…”

Section: H I G H L I G H T Smentioning

confidence: 99%

Denitrification in wetlands: A review towards a quantification at global scale

Martínez-Espinosa

Sauvage

Bitar

et al. 2021

Science of The Total Environment

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Research to understand the nitrogen cycle has been thriving. The production of reactive nitrogen by humans exceeds the removal capacity through denitrification of any natural ecosystem. The surplus of reactive nitrogen is also a significant pollutant that can shift biological diversity and distribution, promotes eutrophication in aquatic ecosystems, and affects human health. Denitrification is the microbial respiration in anoxic conditions and is the main process that removes definitively nitrates from the ecosystem by returning of reactive nitrogen (Nr) to the atmosphere as N 2 and N 2 O emissions. This process occurs in the oceans, aquatic ecosystems and temporary flooded terrestrial ecosystems. Wetlands ecosystems are rich in organic matter and they have regular anoxic soil conditions ideal for denitrification to occur. In the current paper, we provide a meta-analysis that aims at exploring how research around global nitrogen, denitrification and wetlands had evolved in the last fifty years. Back in the time, wetland ecosystems were seen as non-exploitable elements of the landscape, and now they are being integrated as providers of ecosystem services. A significant improvement of molecular biology techniques and genetic extraction have made the denitrification process fully understood allowing constructed wetlands to be more efficient and popular. Yet, large uncertainties remain concerning the dynamic quantification of the global denitrification capacity of natural wetland ecosystems. The contribution of the current investigation is to provide a way forward for reducing these uncertainties by the integration of satellite-based Earth Observation (EO) technology with parsimonious physical based models.

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Effects of slurry acidification on soil N₂O fluxes and denitrification

Malique

Wangari

Andrade-Linares

et al. 2021

J. Plant Nutr. Soil Sci.

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Background Reductions of ammonia volatilization resulting from slurry applications to intensively managed grassland may be achieved via slurry acidification. However, it remains uncertain if this may result in pollution swapping, that is, due to reduced ammonia volatilization and increased soil N availability, emission of nitrous oxide from soils may increase. Aims In this study, we compared control (no fertilizer) and slurry fertilized grassland treatments [not acidified (S) and acidified (AS)] to assess whether slurry acidification results in changes of soil N availability, denitrification potential and activity as well as soil fluxes of nitrous oxide. Methods The study was carried out in a montane grassland system in southern Germany, and parameters were followed over a 43‐days period with continuous measurements of soil GHG fluxes and biweekly measurements of microbial and soil parameters preceding and following two fertilizing events. Results Over the entire observation period cumulative N2O emissions were significantly elevated for treatments receiving slurry applications, with differences between acidified and non‐acidified slurry treatments being overall insignificant. Transcripts of the nirK type nitrite reductase showed significantly higher numbers in soils of the AS treatment. While soil potential denitrification rates (PDR) did not differ between treatments, there was a strong tendency of increased PDRs for the AS treatment. Conclusions Against expectation, we did not find that application of AS affects PDR or soil N2O emissions significantly, though in tendency higher rates of soil N2O emissions as well as higher potential denitrification rates were found in treatments receiving acidified slurry as compared to the slurry only treatment. Our results indicate that longer observation periods and given the significant spatial variability, higher numbers of replicates are needed, to finally assess if slurry application indeed results in increased soil denitrification activity, soil N2O production and soil‐atmosphere N2O emissions.

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Plant and soil effects on denitrification potential in agricultural soils

Cited by 48 publications

References 50 publications

Nitrate uptake and carbon exudation – do plant roots stimulate or inhibit denitrification?

Nitrate uptake and carbon exudation – do plant roots stimulate or inhibit denitrification?

Denitrification in wetlands: A review towards a quantification at global scale

Effects of slurry acidification on soil N₂O fluxes and denitrification

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Plant and soil effects on denitrification potential in agricultural soils

Cited by 48 publications

References 50 publications

Nitrate uptake and carbon exudation – do plant roots stimulate or inhibit denitrification?

Nitrate uptake and carbon exudation – do plant roots stimulate or inhibit denitrification?

Denitrification in wetlands: A review towards a quantification at global scale

Effects of slurry acidification on soil N2O fluxes and denitrification

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Effects of slurry acidification on soil N₂O fluxes and denitrification