Advancement of the Acetylene Inhibition Technique Using Time Series Analysis on Air-Dried Floodplain Soils to Quantify Denitrification Potential

Kaden, Ute Susanne; Fuchs, Elmar; Hecht, Christian; Hein, Thomas; Rupp, Holger; Scholz, Mathias; Schulz‐Zunkel, Christiane

doi:10.3390/geosciences10110431

Cited by 6 publications

(7 citation statements)

References 73 publications

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“…This modification is based on the common assay for measuring denitrification enzyme activity (DEA) with the AIT developed by Smith and Tiedje (1979), that was modified by Groffman et al (1999). Comparative method trials concluded that the use of soils with high nutrient and low sand contents reduces the risk of bias (Qin et al, 2013), which justifies the applicability of the AIT in the context of this study (Kaden et al, 2020). In short, soil samples were pre-incubated for 7 days (d) to 100% water-filled pore space (WFPS).…”

Section: Potential Denitrificationmentioning

confidence: 90%

“…This method has been proven to work when comparing soils and ecosystems (Groffman et al, 2006;Felber et al, 2012;Russell et al, 2019) and allows the soil DP to be estimated at the landscape level. Parameters leading to bias are adjusted to be as low as possible, by using the AIT modified by Kaden et al (2020), which addresses a time series analysis of rewetting as this is likely to strongly affect denitrification. This modification is based on the common assay for measuring denitrification enzyme activity (DEA) with the AIT developed by Smith and Tiedje (1979), that was modified by Groffman et al (1999).…”

Section: Potential Denitrificationmentioning

confidence: 99%

“…Since denitrification processes also occur in soils which are below 100% WFPS, adjusting and upscaling considerations with inundation duration could be extended by implementation of denitrification potentials measured in treatments with less water and nutrient supply. This could be further elaborated by including flooding frequency aspects, as studies showed gas emissions peaks during the drying phase after flooding (Tockner et al, 2000;Shrestha et al, 2014;Kaden et al, 2020).…”

Section: Effects Of Inundation On the Denitrification Capacity Of The Floodplainsmentioning

confidence: 99%

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Soil Characteristics and Hydromorphological Patterns Control Denitrification at the Floodplain Scale

et al. 2021

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Nitrate pollution in aquatic ecosystems is still a major problem in Germany. There is a great potential to permanently remove nitrate from aquatic systems through denitrification as a relevant ecosystem function. However, the controlling factors and the dimension of the denitrification potential are still not fully understood due to the high complexity of the process. This study presents the combined assessment of potential soil denitrification rates, physical and chemical soil parameters, and hydrological parameters from six floodplains of four large German rivers, namely the Rhine, the Elbe, the Weser, and the Main. Based on multivariate statistics, results show that the denitrification potential of soil was almost solely controlled by soil pH. The lab assays showed mean soil denitrification potentials of 6.4–11.4 mg N m−2 h−1 (pH < 7) and 23.0–30.5 mg N m−2 h−1 (pH > 7). We contend that when upscaling these estimates to annual rates of potential denitrification, the duration of average inundation should be incorporated, as this accounts for water saturation and nutrient supply − the major controlling variables for denitrification. Results provide evidence that the denitrification potential can only be fully exploited in frequently inundated floodplains. Thus, despite favorable soil conditions for denitrification, floodplains that have suffered from anthropogenic impacts, lose their importance in nitrate removal for the river system. We conclude that pH and lateral hydrological connectivity are likely to be key factors that should be considered when estimating denitrification as an ecosystem function.

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Section: Potential Denitrificationmentioning

confidence: 90%

Section: Potential Denitrificationmentioning

confidence: 99%

Section: Effects Of Inundation On the Denitrification Capacity Of The Floodplainsmentioning

confidence: 99%

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Soil Characteristics and Hydromorphological Patterns Control Denitrification at the Floodplain Scale

et al. 2021

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“…Potential soil N 2 O flux was measured using a dissolved N 2 O microsensor (Unisense, Germany) [68,69]. Into 40 mL glass vials, 10 g field-moist soils and 35 mL nutrient solution containing KNO 3 and glucose (Kellogg Biological Station) [70][71][72] were added. Following the same protocol, a control for each sample was also analyzed, with 35 mL nutrient solution and no soil.…”

Section: Soil Collection Processing and Analysismentioning

confidence: 99%

Tree Species Influence Nitrate and Nitrous Oxide Production in Forested Riparian Soils

Kelly,

Matejczyk,

Fox-Fogle

et al. 2023

Nitrogen

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Abundance of soil microbial nitrogen (N) cycling genes responsible for nitrification, denitrification, and nitrous oxide reduction may vary with tree species and N inputs, and these variables may be used to predict or mediate nitrate (NO3−) and nitrous oxide (N2O) from soil. Nitrification and denitrification rates have also been linked to tree mycorrhizal associations, as soil beneath species associated with arbuscular mycorrhiza (AM) shows greater nitrification rates than species forming ectomycorrhizal (ECM) associations. In this study, we integrated N microbial functional gene abundance in the soil influenced by six tree species in two sub-catchments receiving either high or low N inputs. The soils beneath the two ECM-associated tree species and the four AM-associated tree species were analyzed for inorganic N content and potential N2O flux and microbial gene abundance (nirK and nosZ) was quantified using qPCR techniques. Other parameters measured include soil pH, moisture, and organic matter. We determined that tree species influence NO3− and N2O production in riparian soils, particularly under high N enrichment. The soil beneath black cherry had the lowest pH, NO3− concentration, potential N2O production, and OM, though this result did not occur in the low N catchment. The strongest predictors of soil NO3− and N2O across the study sites were N enrichment and pH, respectively. These results provide a framework for species selection in managed riparian zones to minimize NO3− and N2O production and improve riparian function.

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“…A revetment addition invariably changes the original magnitude and pathways of the material and energy exchange, as well as affecting water transport, nutrient transport, and heat exchange. These changes contribute to bringing changes in the soil moisture [14,15], temperature [16,17], carbon and nitrogen contents [18][19][20], pH [21][22][23], and oxygen [24,25] at RRIs among different revetments. These variables, in turn, influence soil nitrification and denitrification at RRIs.…”

Section: Introductionmentioning

confidence: 99%

Effects of Revetments on Nitrification and Denitrification Potentials in the Urban River–Riparian Interface

Man,

Xie,

Qin

et al. 2024

Land

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River–riparian interfaces (RRIs) are not only an important type of urban land but also a key area for mitigating and controlling urban river nitrogen pollution. However, the material and energy exchange dynamics in the natural interaction between rivers and RRIs undergo changes due to the introduction of recently constructed revetments, affecting the nitrogen cycling of the RRI, and the impact of revetments on the control and mitigation of river nitrogen pollution in an RRI is unknown. Therefore, RRI soil properties, nitrification potentials (NPs), and denitrification potentials (DPs) were measured in natural, permeable, and impervious revetments in this study. Furthermore, structural equation models were developed to investigate the potential mechanism of the revetment’s impact on RRI NPs and DPs. The NPs of the natural revetment (NR) (7.22 mg/(kg·d)) were 2.20 and 2.16 times that of the impervious revetment (IR) and permeable revetments (PRs), respectively. The most important influencing factors of NPs were the aboveground biomass (AB) and available nitrogen. Similarly, the denitrification potential (DP) of the PR was 3.41 and 2.03 times that of the NR (22.44 mg/(kg·d)) followed by the IR (37.59 mg/(kg·d)). Furthermore, the AB had the greatest direct and total benefit on the DP, and nitrate may be a factor limiting the denitrification process. A revetment primarily disturbs the anaerobic environment and soil properties at RRIs, as well as changing the nitrification and denitrification potentials via soil erosion, solute exchange, and dry–wet alternation. These research results furnish a theoretical foundation for the restoration of urban rivers’ ecology and additionally provide benchmarks for sustainable development in urban areas.

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Advancement of the Acetylene Inhibition Technique Using Time Series Analysis on Air-Dried Floodplain Soils to Quantify Denitrification Potential

Cited by 6 publications

References 73 publications

Soil Characteristics and Hydromorphological Patterns Control Denitrification at the Floodplain Scale

Soil Characteristics and Hydromorphological Patterns Control Denitrification at the Floodplain Scale

Tree Species Influence Nitrate and Nitrous Oxide Production in Forested Riparian Soils

Effects of Revetments on Nitrification and Denitrification Potentials in the Urban River–Riparian Interface

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