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Soil Science Society of America Journal Abstract - Soil Physics & Hydrology

Hotspots of Nitrous Oxide Emission in Fertilized and Unfertilized Perennial Grasses

 

This article in SSSAJ

  1. Vol. 81 No. 3, p. 450-458
     
    Received: Aug 05, 2016
    Accepted: Mar 25, 2017
    Published: June 30, 2017


    * Corresponding author(s): bkr2@cornell.edu
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doi:10.2136/sssaj2016.08.0249
  1. Cedric W. Masona,
  2. Cathelijne R. Stoofb,
  3. Brian K. Richards *c,
  4. Srabani Dasc,
  5. Christine L. Goodaled and
  6. Tammo S. Steenhuise
  1. a Cornell University Dep. of Biological and Environmental Engineering Riley Robb Hall Ithaca, NY 14853
    b Cornell University Department of Biological and Environmental Engineering Riley Robb Hall Ithaca, NY 14853 Wageningen University Soil Geography and Landscape Group P.O. Box 47 6700 AA Wageningen, The Netherlands
    c Cornell University Dep. of Biological and Environmental Engineering Riley Robb Hall Ithaca, NY 14853
    d Cornell University Dep. of Ecology and Evolutionary Biology Corson Hall Ithaca, NY 14853
    e Cornell University Dep. of Biological and Environmental Engineering Riley Robb Hall Ithaca, NY 14853
Core Ideas:
  • We studied hotspots of nitrous oxide emission from perennial grasses on wet soil.
  • Hotspots occurred in a limited range of soil moisture and temperature conditions.
  • Hotspots recurred more frequently at specific places over a three year period.

Abstract

Hotspots of nitrous oxide (N2O) emission are thought to contribute substantially to annual emissions from agricultural soils. We observed N2O fluxes from fertilized and unfertilized C3 and C4 perennial grasses on a wet silt loam soil in New York, United States during the growing season in 2013, 2014, and 2015 using static chambers. Analysis of N2O hotspots within the research plots revealed that hotspots contributed between 34.3 and 39.1% of the total emissions, and constituted between 0.8% and 5.0% of all flux observations. Hotspots were more frequent and of greater magnitude in the fertilized treatments, and occurred when soil temperature was greater than 9.1°C and soil moisture was between about 40% and 80% water filled pore space (WFPS). A single chamber location in the fertilized switchgrass treatment was consistently a hotspot for N2O emission, suggesting that hotspots maintain a stable spatial pattern over extended periods. The maximum magnitude of N2O hotspot emission exhibited a relationship to soil temperature that is similar to that of the microbial growth rate constant.

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