Nitrogen immobilization caused by chemical formation of black- and amide-N in soil

Wei, Jing; Knicker, Heike; Zhou, Zheyan; Eckhardt, Kai‐Uwe; Leinweber, Peter; Wissel, Holger; Yuan, Wenping; Brüggemann, Nicolas

doi:10.1016/j.geoderma.2022.116274

Cited by 5 publications

(3 citation statements)

References 43 publications

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“…, precipitation of N-compounds with plant phenolics and an aggregation with mineral soil particles (Adamczyk et al 2008 ; Eskelinen et al 2009 ; Hättenschwiler and Vitousek 2000 ; Knicker 2011 ). High soil N concentrations promote organic compound stabilization through various chemical reactions and through modifying the degradation capacity of the soil microbial community (Bonner et al 2022 ; Knicker 2011 ; Wei et al 2023 ). The earlier vegetation under combined N-fertilization and disturbance could also still exert legacies on soil organic matter quality.…”

Section: Discussionmentioning

confidence: 99%

N-fertilization and disturbance exert long-lasting complex legacies on subarctic ecosystems

Manninen,

Myrsky,

Tolvanen

et al. 2024

Oecologia

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Subarctic ecosystems are subjected to increasing nitrogen (N) enrichment and disturbances that induce particularly strong effects on plant communities when occurring in combination. There is little experimental evidence on the longevity of these effects. We applied N-fertilization (40 kg urea-N ha−1 year−1 for 4 years) and disturbance (removal of vegetation and organic soil layer on one occasion) in two plant communities in a subarctic forest-tundra ecotone in northern Finland. Within the first four years, N-fertilization and disturbance increased the share of deciduous dwarf shrubs and graminoids at the expense of evergreen dwarf shrubs. Individual treatments intensified the other’s effect resulting in the strongest increase in graminoids under combined N-fertilization and disturbance. The re-analysis of the plant communities 15 years after cessation of N-fertilization showed an even higher share of graminoids. 18 years after disturbance, the total vascular plant abundance was still substantially lower and the share of graminoids higher. At the same point, the plant community composition was the same under disturbance as under combined N-fertilization and disturbance, indicating that multiple perturbations no longer reinforced the other’s effect. Yet, complex interactions between N-fertilization and disturbance were still detected in the soil. We found higher organic N under disturbance and lower microbial N under combined N-fertilization and disturbance, which suggests a lower bioavailability of N sources for soil microorganisms. Our findings support that the effects of enhanced nutrients and disturbance on subarctic vegetation persist over decadal timescales. However, they also highlight the complexity of plant–soil interactions that drive subarctic ecosystem responses to multiple perturbations across varying timescales.

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Section: Discussionmentioning

confidence: 99%

N-fertilization and disturbance exert long-lasting complex legacies on subarctic ecosystems

Manninen,

Myrsky,

Tolvanen

et al. 2024

Oecologia

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“…The chemical pathway in which NO 2 − is chemically reduced to N 2 O is called chemodenitrification (Equations (1) and ( 2)). Ferrous iron (Fe (II)) and lignin-derived soil organic compounds are common reductants in chemodenitrification [44,[56][57][58][59][60]. In general, structural iron plays a more important role in chemodenitrification compared with dissolved free Fe (II) ions [61].…”

Section: Abiotic Pathwaysmentioning

confidence: 99%

N2O Emissions from Aquatic Ecosystems: A Review

et al. 2023

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Emissions of nitrous oxide (N2O) from aquatic ecosystems are on the rise due to the dramatic increase in global reactive nitrogen input by anthropogenic activities (e.g., agricultural nitrogen fertilizer use). However, uncertainties exist in the estimation of aquatic N2O budgets due to limited knowledge of mechanisms involved in aquatic N2O emissions, as well as the N2O flux measurements and modelling. To give a full picture of aquatic N2O emissions, this review discusses the biotic and abiotic mechanisms involved in aquatic N2O emissions, common methods used in aquatic N2O flux measurements (including field measurement methods and formula simulation methods), and alternatives for aquatic N2O budget estimation. In addition, this review also suggests that stable isotope technology is promising in the application of aquatic N2O source partitioning.

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“…

Dramatically increased reactive nitrogen (N) inputs over the past decades caused numerous eco-environmental problems in coastal marine ecosystems (Wei et al, 2022;Wei et al, 2023). Estuarine and coastal ecosystems are not only critical zones connecting terrestrial and marine ecosystems, but also a hotpot for greenhouse gas nitrous oxide (N 2 O) emissions and diverse N biogeochemical processes such as denitrification, anammox, and N burial in sediment (Figure 1).

…”

mentioning

confidence: 99%

Editorial: Advances in estuarine and coastal nitrogen cycle

et al. 2023

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Dramatically increased reactive nitrogen (N) inputs over the past decades caused numerous eco-environmental problems in coastal marine ecosystems (Wei et al., 2022;Wei et al., 2023). Estuarine and coastal ecosystems are not only critical zones connecting terrestrial and marine ecosystems, but also a hotpot for greenhouse gas nitrous oxide (N 2 O) emissions and diverse N biogeochemical processes such as denitrification, anammox, and N burial in sediment (Figure 1). In estuarine and coastal ecosystems, N cycling is temporally and spatially complex and dynamically influenced by multiple interrelated ecosystem components (Liu et al., 2020;Murray et al., 2020). It is necessary to deepen our knowledge of N cycle in estuarine and coastal ecosystems (Tian et al., 2020;Harris et al., 2022). Within this aspect, this Research Topic focuses on spatiotemporal N variations, N fluxes, as well as their controlling factors and environmental implications. Sixteen articles were finally collected in this Research Topic as summarized below.Variations in natural forcing and environmental conditions affect spatiotemporal patterns of nitrogen cycle processes. Zhang et al. investigated the influence of the tidal cycle on total nitrogen (TN) and N speciation in a coastal bay. They reported that while TN concentrations during the spring and neap tides did not differ, significant differences in particulate nitrogen (PN) and NO 2 − were observed between the spring and neap tides.Furthermore, the net exchange flux of TN during spring tide was 4.3 times higher than that of neap tide. They also reported an above 50% contribution of the total dissolved nitrogen (TDN) pool in TN. Among TDN, dissolved organic nitrogen (DON) accounted for higher proportion during the spring tides compared to neap tides. Xu et al. show that both local and remote forcing, such as winds, upwelling, and climate factors like El Niño-Southern Oscillation, Pacific Decadal Oscillation, and North Pacific Gyre Oscillation, affected the variations of sedimentary nitrogen isotope (d 15 N sed ) in the Santa Barbara Basin (SBB). Sedimentary nitrogen isotopes has often been used as a proxy for the denitrification process to track temporal record. For instance, the long-term variations of the SBB d 15 N sed signature with decreasing and increasing trend from 1940 to 2019 reflect changes in denitrification Frontiers in Marine Science frontiersin.org 01

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Nitrogen immobilization caused by chemical formation of black- and amide-N in soil

Cited by 5 publications

References 43 publications

N-fertilization and disturbance exert long-lasting complex legacies on subarctic ecosystems

N-fertilization and disturbance exert long-lasting complex legacies on subarctic ecosystems

N2O Emissions from Aquatic Ecosystems: A Review

Editorial: Advances in estuarine and coastal nitrogen cycle

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