@misc{fiencke_microbiogeochemical_traits_2022, author={Fiencke, C., Marushchak, M., Sanders, T., Wegner, R., Beer, C.}, title={Microbiogeochemical Traits to Identify Nitrogen Hotspots in Permafrost Regions}, year={2022}, howpublished = {journal article}, doi = {https://doi.org/10.3390/nitrogen3030031}, abstract = {Permafrost-affected tundra soils are large carbon (C) and nitrogen (N) reservoirs. However, N is largely bound in soil organic matter (SOM), and ecosystems generally have low N availability. Therefore, microbial induced N-cycling processes and N losses were considered negligible. Recent studies show that microbial N processing rates, inorganic N availability, and lateral N losses from thawing permafrost increase when vegetation cover is disturbed, resulting in reduced N uptake or increased N input from thawing permafrost. In this review, we describe currently known N hotspots, particularly bare patches in permafrost peatland or permafrost soils affected by thermokarst, and their microbiogeochemical characteristics, and present evidence for previously unrecorded N hotspots in the tundra. We summarize the current understanding of microbial N cycling processes that promote the release of the potent greenhouse gas (GHG) nitrous oxide (N2O) and the translocation of inorganic N from terrestrial into aquatic ecosystems. We suggest that certain soil characteristics and microbial traits can be used as indicators of N availability and N losses. Identifying N hotspots in permafrost soils is key to assessing the potential for N release from permafrost-affected soils under global warming, as well as the impact of increased N availability on emissions of carbon-containing GHGs.}, note = {Online available at: \url{https://doi.org/10.3390/nitrogen3030031} (DOI). Fiencke, C.; Marushchak, M.; Sanders, T.; Wegner, R.; Beer, C.: Microbiogeochemical Traits to Identify Nitrogen Hotspots in Permafrost Regions. Nitrogen. 2022. vol. 3, no. 3, 458-501. DOI: 10.3390/nitrogen3030031}}