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Title: Phosphorus limits nitrogen dynamics in the O horizon of a forested watershed in Maine, USA

Abstract

Anthropogenic emissions have altered the N status of northeastern USA forests, highlighting the importance of our imperfect understanding of the interaction between nitrogen and phosphorus in response to atmospheric N deposition. We investigated soil N and P dynamics at the Bear Brook Watershed in Maine, a long-term paired watershed experiment established to study ecosystem response to experimental N enrichment. One watershed (West Bear, WB) was treated bimonthly for 25 years with ammonium sulfate, and the reference East Bear (EB) received only ambient N deposition. We conducted field and laboratory studies to examine the interaction between N and P in O horizon soils in both EB and WB. In the “Pulse-Chase” Study, a field addition of 100 kg P ha-1 resulted in an overall 38% decrease in extractable ammonium (NH4+-N), due to increased immobilization. Noteworthy was that even under ambient N deposition rates, EB displayed parallel, although lower, evidence of P limitation compared to WB. In contrast, in a “Response Surface” laboratory study, soils incubated in the laboratory at rates of 0 to 200 kg P ha-1 showed increases in PNNM and NH4+-N concentrations in response to P additions. There was no effect of N-status in the Response Surface Study, butmore » hardwood soils showed a faster response and greater rates of potential net N mineralization (PNNM) compared to softwood soils. Despite contrasting responses, both the field and laboratory studies suggested that N dynamics at BBWM were P limited, and that N status and forest type influenced the N and P interaction.« less

Authors:
 [1];  [2];  [3];  [4];  [5];  [3]
  1. NA
  2. BATTELLE (PACIFIC NW LAB)
  3. University of Maine
  4. University of Jena
  5. University of Alabama - Tuscaloosa
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1601779
Report Number(s):
PNNL-SA-143045
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Soil Science Society of America Journal
Additional Journal Information:
Journal Volume: 83; Journal Issue: 4
Country of Publication:
United States
Language:
English

Citation Formats

Salvino, Cayce, Patel, Kaizad F., Fernandez, Ivan, Gruselle, Marie-Cecile, Tatariw, Corianne, and MacRae, J D. Phosphorus limits nitrogen dynamics in the O horizon of a forested watershed in Maine, USA. United States: N. p., 2019. Web. doi:10.2136/sssaj2019.02.0043.
Salvino, Cayce, Patel, Kaizad F., Fernandez, Ivan, Gruselle, Marie-Cecile, Tatariw, Corianne, & MacRae, J D. Phosphorus limits nitrogen dynamics in the O horizon of a forested watershed in Maine, USA. United States. doi:10.2136/sssaj2019.02.0043.
Salvino, Cayce, Patel, Kaizad F., Fernandez, Ivan, Gruselle, Marie-Cecile, Tatariw, Corianne, and MacRae, J D. Wed . "Phosphorus limits nitrogen dynamics in the O horizon of a forested watershed in Maine, USA". United States. doi:10.2136/sssaj2019.02.0043.
@article{osti_1601779,
title = {Phosphorus limits nitrogen dynamics in the O horizon of a forested watershed in Maine, USA},
author = {Salvino, Cayce and Patel, Kaizad F. and Fernandez, Ivan and Gruselle, Marie-Cecile and Tatariw, Corianne and MacRae, J D.},
abstractNote = {Anthropogenic emissions have altered the N status of northeastern USA forests, highlighting the importance of our imperfect understanding of the interaction between nitrogen and phosphorus in response to atmospheric N deposition. We investigated soil N and P dynamics at the Bear Brook Watershed in Maine, a long-term paired watershed experiment established to study ecosystem response to experimental N enrichment. One watershed (West Bear, WB) was treated bimonthly for 25 years with ammonium sulfate, and the reference East Bear (EB) received only ambient N deposition. We conducted field and laboratory studies to examine the interaction between N and P in O horizon soils in both EB and WB. In the “Pulse-Chase” Study, a field addition of 100 kg P ha-1 resulted in an overall 38% decrease in extractable ammonium (NH4+-N), due to increased immobilization. Noteworthy was that even under ambient N deposition rates, EB displayed parallel, although lower, evidence of P limitation compared to WB. In contrast, in a “Response Surface” laboratory study, soils incubated in the laboratory at rates of 0 to 200 kg P ha-1 showed increases in PNNM and NH4+-N concentrations in response to P additions. There was no effect of N-status in the Response Surface Study, but hardwood soils showed a faster response and greater rates of potential net N mineralization (PNNM) compared to softwood soils. Despite contrasting responses, both the field and laboratory studies suggested that N dynamics at BBWM were P limited, and that N status and forest type influenced the N and P interaction.},
doi = {10.2136/sssaj2019.02.0043},
journal = {Soil Science Society of America Journal},
number = 4,
volume = 83,
place = {United States},
year = {2019},
month = {8}
}

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