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    High-Resolution Denitrification Kinetics in Pasture Soils Link N2O Emissions to pH, and Denitrification to C Mineralization

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    Author
    Samad, Sainur
    Bakken, Lars R.
    Nadeem, Shahid
    Clough, Timothy J.
    de Klein, Cecile A.M.
    Richards, Karl G.
    Lanigan, Gary
    Morales, Sergio E.
    Keyword
    Denitrification Kinetics
    Pasture soils
    automated-high-resolution GC detection system
    Nitrates
    Soil pH
    carbon (C) mineralization
    Date
    18/03/2016
    
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    URI
    http://hdl.handle.net/11019/1012
    Citation
    Samad MS, Bakken LR, Nadeem S, Clough TJ, de Klein CAM, Richards KG, et al. (2016) High-Resolution Denitrification Kinetics in Pasture Soils Link N2O Emissions to pH, and Denitrification to C Mineralization. PLoS ONE 11(3): e0151713. doi:10.1371/journal.pone.0151713
    Abstract
    Denitrification in pasture soils is mediated by microbial and physicochemical processes leading to nitrogen loss through the emission of N2O and N2. It is known that N2O reduction to N2 is impaired by low soil pH yet controversy remains as inconsistent use of soil pH measurement methods by researchers, and differences in analytical methods between studies, undermine direct comparison of results. In addition, the link between denitrification and N2O emissions in response to carbon (C) mineralization and pH in different pasture soils is still not well described. We hypothesized that potential denitrification rate and aerobic respiration rate would be positively associated with soils. This relationship was predicted to be more robust when a high resolution analysis is performed as opposed to a single time point comparison. We tested this by characterizing 13 different temperate pasture soils from northern and southern hemispheres sites (Ireland and New Zealand) using a fully automated-high-resolution GC detection system that allowed us to detect a wide range of gas emissions simultaneously. We also compared the impact of using different extractants for determining pH on our conclusions. In all pH measurements, soil pH was strongly and negatively associated with both N2O production index (IN2O) and N2O/(N2O+N2) product ratio. Furthermore, emission kinetics across all soils revealed that the denitrification rates under anoxic conditions (NO+N2O+N2 μmol N/h/vial) were significantly associated with C mineralization (CO2 μmol/h/vial) measured both under oxic (r2 = 0.62, p = 0.0015) and anoxic (r2 = 0.89, p<0.0001) conditions.
    Funder
    New Zealand Fund for Global Partnerships in Livestock Emissions Research
    Grant Number
    16084
    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.1371/journal.pone.0151713
    Scopus Count
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    Environment, Soils & Land Use
    Environment, Soils & Land Use
    Environment, Soils & Land Use

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