Journalartikel

Jahr der Veröffentlichung: 2023

Zeitschrift: Soil Biology and Biochemistry

Bandnummer: 178

ISSN: 0038-0717

eISSN: 1879-3428

Open Access Status: Bronze

DOI Link: https://doi.org/10.1016/j.soilbio.2023.108958

Verlag: Elsevier

Abstract: 
Nitrite is an important precursor of many environmentally hazardous compounds (e.g., nitrate, nitrous oxide, and nitrous acid). However, its dynamics in the soil environment are not yet fully understood. The NtraceNitrite tool has been successful in analyzing N-15 tracing data. Here, based on a N-15 tracing experiment (under aerobic condition) where either the nitrite, the nitrate, or the ammonium pool was labelled, we developed an extended model (NO2Trace), which was featured by the addition of coupled nitrate reduction and nitrite re-oxidation and the separation of the nitrate pool in two sub-pools. With 5 additional parameters optimized, NO2Trace was able to achieve a superior fit to the data, as compared to the Ntrace(Nitrite) tool. The additional features might offer a suitable explanation for the isotopic composition of nitrate produced via nitrification in terrestrial ecosystems. Our results carry two important implications: (i) a key assumption of the classical isotope pool dilution technique (i.e., no reflux of tracer) for estimating gross nitrate fluxes is violated, leading to considerable underestimations (22-99% in the datasets tested); (ii) re-oxidation can dominate the consumption (similar to 75%) of nitrite derived from nitrate reduction, indicating the potential of this process as a target for nitrogen retention mechanism against gaseous nitrogen losses (through nitrite reduction). The additional features of the extended model show a tighter cycle between soil nitrite and nitrate than considered previously and provide a more comprehensive description of soil nitrite transformations. This study also highlights that more work is needed to develop methods capable of separating process- and pathways-specific nitrate and nitrite pools.

Harvard-Zitierstil: Zheng, J., Fujii, K., Koba, K., Wanek, W., Müller, C., Jansen-Willems, A., et al. (2023) Revisiting process-based simulations of soil nitrite dynamics: Tighter cycling between nitrite and nitrate than considered previously, Soil Biology and Biochemistry, 178, Article 108958. https://doi.org/10.1016/j.soilbio.2023.108958

APA-Zitierstil: Zheng, J., Fujii, K., Koba, K., Wanek, W., Müller, C., Jansen-Willems, A., Nakajima, Y., Wagai, R., & Canarini, A. (2023). Revisiting process-based simulations of soil nitrite dynamics: Tighter cycling between nitrite and nitrate than considered previously. Soil Biology and Biochemistry. 178, Article 108958. https://doi.org/10.1016/j.soilbio.2023.108958