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

Salvino, Cayce; Patel, Kaizad F.; Fernandez, Ivan; Gruselle, Marie-Cecile; Tatariw, Corianne; MacRae, J D.

doi:10.2136/sssaj2019.02.0043

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

Journal Article · Wed Aug 21 00:00:00 EDT 2019 · Soil Science Society of America Journal

DOI:https://doi.org/10.2136/sssaj2019.02.0043· OSTI ID:1601779

Salvino, Cayce ^[1]; Patel, Kaizad F. ^[2]; Fernandez, Ivan ^[3]; Gruselle, Marie-Cecile ^[4]; Tatariw, Corianne ^[5]; MacRae, J D. ^[3]

NA
BATTELLE (PACIFIC NW LAB)
University of Maine
University of Jena
University of Alabama - Tuscaloosa

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.

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Research Organization:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1601779

Report Number(s):: PNNL-SA-143045

Journal Information:: Soil Science Society of America Journal, Vol. 83, Issue 4

Country of Publication:: United States

Language:: English

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