@article{c895b45e78b945d9bbe7c045d0b50825,
title = "Adding Depth to Our Understanding of Nitrogen Dynamics in Permafrost Soils",
abstract = "Losses of C from decomposing permafrost may be offset by increased productivity of tundra plants, but nitrogen availability partially limits plant growth in tundra ecosystems. In this soil incubation experiment carbon (C) and nitrogen (N) cycling dynamics were examined from the soil surface down through upper permafrost. We found that losses of CO2 were negatively correlated to net N mineralization because C-rich surface soils mineralized little N, while deep soils had low rates of C respiration but high rates of net N mineralization. Permafrost soils released a large flush of inorganic N when initially thawed. Depth-specific rates of N mineralization from the incubation were combined with thaw depths and soil temperatures from a nearby manipulative warming experiment to simulate the potential magnitude, timing, and depth of inorganic N release during the process of permafrost thaw. Our calculations show that inorganic N released from newly thawed permafrost may be similar in magnitude to the increase in N mineralized by warmed soils in the middle of the profile. The total release of inorganic N from the soil profile during the simulated thaw process was twice the size of the observed increase in the foliar N pool observed at the manipulative experiment. Our findings suggest that increases in N availability are likely to outpace the N demand of tundra plants during the first 5 years of permafrost thaw and may increase C losses from surface soils as well as induce denitrification and leaching of N from these ecosystems.",
keywords = "mineralization, moist acidic tussock tundra, nitrogen availability, permafrost thaw, soil depth",
author = "Salmon, {Verity G.} and Christina Sch{\"a}del and Rosvel Bracho and Elaine Pegoraro and Gerardo Celis and Marguerite Mauritz and Mack, {Michelle C.} and Schuur, {Edward A.G.}",
note = "Funding Information: The data used are listed in the references, tables, and supporting information and are available through the LTER data catalogue (CiPEHR soil temperature DOI: 10.6073/pasta/4eccfacb7e011bc5d0b5b8813ec324ab, CiPEHR thaw depth DOI: 10.6073/pasta/d0fb84d0ca48864b482ddaecc4ffbf76, soil incubation soil properties and final microbial biomass DOI: 10.6073/pasta/8c8a28a8d8ed4f443cb75ed00aabd647, soil incubation CO2 fluxes DOI: 10.6073/pasta/42154f55124b9774632094ff6242f7d3, soil incubation DIN and DOC extracts DOI: 10.6073/pasta/eef7cf20be08bfc20f1ea0540e2a1431). Supporting information can be found in supporting information Table S1. The authors state no conflict of interest and would like to thank Patrick Soucy, Grace Crummer, Julia Reiskind, Jack Hutchings, April Melvin, and Jason Downing for supporting lab analyses, fieldwork, and data archival. This research was supported financially by Denali National Park Research Fellowship (V.G Salmon); US Department of Energy, Office of Biological and Environmental Research, Terrestrial Ecosystem Science (TES) Program, Award DE-SC0006982 (E. A. G. Schuur); National Parks Inventory and Monitoring Program (E.A.G. Schuur); National Science Foundation Bonanza Creek LTER Program, Award 1026415 (E. A. G. Schuur); National Science Foundation Office of Polar Programs, Award 1203777 (E. A. G. Schuur). Completion of this manuscript by V. G. Salmon was also supported by the Office of Biological and Environmental Research in the U.S. Department of Energy's Office of Science through Oak Ridge National Laboratory. This manuscript has been authored by UT-Battelle, LLC under contract DE-AC05-00OR22725 with the U.S. Department of Energy. The U.S. Government retains and the publisher, by accepting the article for publication, acknowledges that the U.S. Government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for U.S. Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan). Funding Information: The data used are listed in the references, tables, and supporting information and are available through the LTER data catalogue (CiPEHR soil temperature DOI: 10.6073/pasta/ 4eccfacb7e011bc5d0b5b8813ec324ab, CiPEHR thaw depth DOI: 10.6073/pasta/ d0fb84d0ca48864b482ddaecc4ffbf76, soil incubation soil properties and final microbial biomass DOI: 10.6073/pasta/ 8c8a28a8d8ed4f443cb75ed00aabd647, soil incubation CO2fluxes DOI: 10.6073/ pasta/42154f55124b9774632094 ff6242f7d3, soil incubation DIN and DOC extracts DOI: 10.6073/pasta/ eef7cf20be08bfc20f1ea0540e2a1431). Supporting information can be found in supporting information Table S1. The authors state no conflict of interest and would like to thank Patrick Soucy, Grace Crummer, Julia Reiskind, Jack Hutchings, April Melvin, and Jason Downing for supporting lab analyses, fieldwork, and data archival. This research was supported financially by Denali National Park Research Fellowship (V.G Salmon); US Department of Energy, Office of Biological and Environmental Research, Terrestrial Ecosystem Science (TES) Program, Award DE-SC0006982 (E. A. G. Schuur); National Parks Inventory and Monitoring Program (E.A.G. Schuur); National Science Foundation Bonanza Creek LTER Program, Award 1026415 (E. A. G. Schuur); National Science Foundation Office of Polar Programs, Award 1203777 (E. A. G. Schuur). Completion of this manuscript by V. G. Salmon was also supported by the Office of Biological and Environmental Research in the U.S. Department of Energy{\textquoteright}s Office of Science through Oak Ridge National Laboratory. This manuscript has been authored by UT- Battelle, LLC under contract DE-AC05- 00OR22725 with the U.S. Department of Energy. The U.S. Government retains and the publisher, by accepting the article for publication, acknowledges that the U.S. Government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for U.S. Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/ doe-public-access-plan). Publisher Copyright: {\textcopyright}2018. American Geophysical Union. All Rights Reserved.",
year = "2018",
month = aug,
doi = "10.1029/2018JG004518",
language = "English (US)",
volume = "123",
pages = "2497--2512",
journal = "Journal of Geophysical Research: Biogeosciences",
issn = "2169-8953",
publisher = "Wiley-Blackwell Publishing Ltd",
number = "8",
}