Adding Depth to Our Understanding of Nitrogen Dynamics in Permafrost Soils

Salmon, Verity G.; Schädel, Christina; Bracho, Rosvel; Pegoraro, Elaine; Celis, Gerardo; Mauritz, Marguerite; Mack, Michelle C.; Schuur, Edward A. G.

doi:10.1029/2018JG004518

Title: Adding Depth to Our Understanding of Nitrogen Dynamics in Permafrost Soils

Journal Article · 13 July 2018 · Journal of Geophysical Research. Biogeosciences

DOI: https://doi.org/10.1029/2018JG004518 · OSTI ID:1468280

^[1];

^[2]; Bracho, Rosvel ^[3]; Pegoraro, Elaine ^[2];

^[2];

^[2]; Mack, Michelle C. ^[2]; Schuur, Edward A. G. ^[2]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Northern Arizona Univ., Flagstaff, AZ (United States)
Univ. of Florida, Gainesville, FL (United States)

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. Here, 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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1468280

Alternate ID(s):: OSTI ID: 1465909

Journal Information:: Journal of Geophysical Research. Biogeosciences, Journal Name: Journal of Geophysical Research. Biogeosciences Vol. TBD; ISSN 2169-8953

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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54 ENVIRONMENTAL SCIENCES
permafrost thaw
nitrogen availability
soil depth
moist acidic tussock tundra
mineralization

Title: Adding Depth to Our Understanding of Nitrogen Dynamics in Permafrost Soils

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