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Título: | Short-term impact of a wildfire on net and gross N transformation rates. |
Autor: | Gómez Rey, María Xesús; González Prieto, Serafín Jesús CSIC ORCID | Palabras clave: | N mineralization gross N fluxes net N fluxes NH4 +-N immobilization NO3 --N immobilization extractable nutrients |
Fecha de publicación: | 2013 | Editor: | Springer Nature | Citación: | Biology and Fertility of Soils 49: 1065-1075 (2013) | Resumen: | Wildfires often modify soil properties, including the N status and net N mineralization rates, but their impacts on gross N fluxes have been scarcely evaluated. We aimed to ascertain the immediate effects of a medium-high severity wildfire on soil N transformations. Net and gross N rates were analytically and numerically (FLUAZ) quantified in burned (BS) and unburned (US) topsoils from the temperate-humid region (NW Spain). Analytical and numerical solutions were significantly correlated for both gross N mineralization (m) (r2= 0.815; p<0.001) and gross nitrification (n) (r2= 0.950; p<0.001). In BS, all NH4 +-N fluxes (net m, gross m and gross NH4 +- N immobilization, ia) increased, while those of NO3 --N decreased (gross n and gross NO3 --N immobilization, in) or did not vary (net n). In US and BS, gross m (0.26-3.60 and 4.70-15.42 mg N kg-1 d-1, respectively) predominated over gross n (0.026-2.45 and 0.001-0.002 mg N kg-1 d-1, respectively), and the same was true for the net fluxes. Compared with the few available data on recently burned soils (m= 8-55 mg N kg-1 d-1; n= 0.50- 1.83 mg N kg-1 d-1), our gross m and n rates were similar and very low, respectively; gross n showed that nitrifiers were active in US and also in BS, despite the 98 % reduction observed immediately after the fire. For gross fluxes, m increased more than ia suggesting an NH4 +-N accumulation, but there is no risk of NO3 --N leaching because n decreased more than in. | URI: | http://hdl.handle.net/10261/88150 | ISSN: | 0178-2762 |
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Gomez-Rey_&_Gonzalez-Prieto_2013_BFS_49_1065-1075.pdf | 1,19 MB | Adobe PDF | Visualizar/Abrir |
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