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Soil nitrogen dynamics three years after a severe Araucaria-Nothofagus forest fire

Y Rivas, Dries Huygens (UGent) , H Knicker, R Godoy, F Matus and Pascal Boeckx (UGent)
(2012) AUSTRAL ECOLOGY. 37(2). p.153-163
Author
Organization
Abstract
Wildfires have shaped the biogeography of south Chilean AraucariaNothofagus rainforest vegetation patterns, but their impact on soil properties and associated nutrient cycling remains unclear. Nitrogen (N) availability shows a site-specific response to wildfire events indicating the need for an increased understanding of underlying mechanisms that drive changes in soil N cycling. In this study, we selected unburned and burned sites in a large area of the National Park Tolhuaca that was affected by a stand-replacing wildfire in February 2002. We conducted net N cycling flux measurements (net ammonification, net nitrification and net N mineralization assays) on soils sampled 3 years after fire. In addition, samples were physically fractionated and natural abundance of C and N, and 13C-NMR analyses were performed. Results indicated that standing inorganic N pools were greater in the burned soil, but that no main differences in net N cycling fluxes were observed between unburned and burned sites. In both sites, net ammonification and net nitrification fluxes were low or negative, indicating N immobilization. Multiple linear regression analyses indicated that soil N cycling could largely be explained by two parameters: light fraction (LF) soil organic matter N content and aromatic Chemical Oxidation Resistant Carbon (CORECarom), a relative measure for char. The LF fraction, a strong NH4+ sink, decreased as a result of fire, while CORECarom increased in the burned soil profile and stimulated NO3- production. The absence of increased total net nitrification might relate to a decrease in heterotrophic nitrification after wildfire. We conclude that (i) wildfire induced a shift in N transformation pathways, but not in total net N mineralization, and (ii) stable isotope measurements are a useful tool to assess post-fire soil organic matter dynamics.
Keywords
CHEMICAL OXIDATION, STABLE-ISOTOPES, NATURAL-ABUNDANCE, MICROBIAL BIOMASS, PONDEROSA PINE, ORGANIC-MATTER, C-13 NMR-SPECTRA, stable isotope, organic matter fractionation, N cycling, Chile, 13C-NMR, Andisol, CONIFER FORESTS, BLACK CARBON, LONG-TERM

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Citation

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MLA
Rivas, Y., et al. “Soil Nitrogen Dynamics Three Years after a Severe Araucaria-Nothofagus Forest Fire.” AUSTRAL ECOLOGY, vol. 37, no. 2, 2012, pp. 153–63, doi:10.1111/j.1442-9993.2011.02258.x.
APA
Rivas, Y., Huygens, D., Knicker, H., Godoy, R., Matus, F., & Boeckx, P. (2012). Soil nitrogen dynamics three years after a severe Araucaria-Nothofagus forest fire. AUSTRAL ECOLOGY, 37(2), 153–163. https://doi.org/10.1111/j.1442-9993.2011.02258.x
Chicago author-date
Rivas, Y, Dries Huygens, H Knicker, R Godoy, F Matus, and Pascal Boeckx. 2012. “Soil Nitrogen Dynamics Three Years after a Severe Araucaria-Nothofagus Forest Fire.” AUSTRAL ECOLOGY 37 (2): 153–63. https://doi.org/10.1111/j.1442-9993.2011.02258.x.
Chicago author-date (all authors)
Rivas, Y, Dries Huygens, H Knicker, R Godoy, F Matus, and Pascal Boeckx. 2012. “Soil Nitrogen Dynamics Three Years after a Severe Araucaria-Nothofagus Forest Fire.” AUSTRAL ECOLOGY 37 (2): 153–163. doi:10.1111/j.1442-9993.2011.02258.x.
Vancouver
1.
Rivas Y, Huygens D, Knicker H, Godoy R, Matus F, Boeckx P. Soil nitrogen dynamics three years after a severe Araucaria-Nothofagus forest fire. AUSTRAL ECOLOGY. 2012;37(2):153–63.
IEEE
[1]
Y. Rivas, D. Huygens, H. Knicker, R. Godoy, F. Matus, and P. Boeckx, “Soil nitrogen dynamics three years after a severe Araucaria-Nothofagus forest fire,” AUSTRAL ECOLOGY, vol. 37, no. 2, pp. 153–163, 2012.
@article{2120366,
  abstract     = {{Wildfires have shaped the biogeography of south Chilean AraucariaNothofagus rainforest vegetation patterns, but their impact on soil properties and associated nutrient cycling remains unclear. Nitrogen (N) availability shows a site-specific response to wildfire events indicating the need for an increased understanding of underlying mechanisms that drive changes in soil N cycling. In this study, we selected unburned and burned sites in a large area of the National Park Tolhuaca that was affected by a stand-replacing wildfire in February 2002. We conducted net N cycling flux measurements (net ammonification, net nitrification and net N mineralization assays) on soils sampled 3 years after fire. In addition, samples were physically fractionated and natural abundance of C and N, and 13C-NMR analyses were performed. Results indicated that standing inorganic N pools were greater in the burned soil, but that no main differences in net N cycling fluxes were observed between unburned and burned sites. In both sites, net ammonification and net nitrification fluxes were low or negative, indicating N immobilization. Multiple linear regression analyses indicated that soil N cycling could largely be explained by two parameters: light fraction (LF) soil organic matter N content and aromatic Chemical Oxidation Resistant Carbon (CORECarom), a relative measure for char. The LF fraction, a strong NH4+ sink, decreased as a result of fire, while CORECarom increased in the burned soil profile and stimulated NO3- production. The absence of increased total net nitrification might relate to a decrease in heterotrophic nitrification after wildfire. We conclude that (i) wildfire induced a shift in N transformation pathways, but not in total net N mineralization, and (ii) stable isotope measurements are a useful tool to assess post-fire soil organic matter dynamics.}},
  author       = {{Rivas, Y and Huygens, Dries and Knicker, H and Godoy, R and Matus, F and Boeckx, Pascal}},
  issn         = {{1442-9985}},
  journal      = {{AUSTRAL ECOLOGY}},
  keywords     = {{CHEMICAL OXIDATION,STABLE-ISOTOPES,NATURAL-ABUNDANCE,MICROBIAL BIOMASS,PONDEROSA PINE,ORGANIC-MATTER,C-13 NMR-SPECTRA,stable isotope,organic matter fractionation,N cycling,Chile,13C-NMR,Andisol,CONIFER FORESTS,BLACK CARBON,LONG-TERM}},
  language     = {{eng}},
  number       = {{2}},
  pages        = {{153--163}},
  title        = {{Soil nitrogen dynamics three years after a severe Araucaria-Nothofagus forest fire}},
  url          = {{http://dx.doi.org/10.1111/j.1442-9993.2011.02258.x}},
  volume       = {{37}},
  year         = {{2012}},
}
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