CIFICEN   24414
CENTRO DE INVESTIGACIONES EN FISICA E INGENIERIA DEL CENTRO DE LA PROVINCIA DE BUENOS AIRES
Unidad Ejecutora - UE
artículos
Título:
Afforested sites in a temperate grassland region: influence on soil properties and methane uptake
Autor/es:
PRIANO, M. E.; BERKOVIC, A. M.; JULIARENA, M.PAULA; MESTELAN, S.; GRATTON, ROBERTO;; FUSÉ, V. S.; GUZMÁN, SERGIO
Revista:
AGROFORESTRY SYSTEMS
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 2017
ISSN:
0167-4366
Resumen:
Methane (CH4) is a potent greenhouse gas whose concentration in the atmosphere has increased globally as a result of the growing imbalance between CH4 production and consumption. CH4 flux at the soil-atmosphere interface (SAI) results from the balance between CH4 production (methanogenesis) and CH4 consumption (methanotrophy). The latter predominates in well-aerated mineral soils; is affected by a combination of abiotic and biotic factors, especially soil diffusivity, which depends on soil properties, and methanotroph activity. This work reports results of CH4 fluxes from afforested sites located in a temperate region of formerly native grassland in Buenos Aires Province (Argentina, Southern Hemisphere), taking a naturalized pasture as a reference. Methane concentration [CH4] and soil parameters along the profile were also measured to understand intersite differences in CH4 fluxes at the SAI, that could be related to vegetation cover and its influence on soil properties and therefore, on CH4 soil diffusivity. At all sites soils were CH4 sinks in the range of -3.55 to -14.39 ngCH4 m-2 s-1; the naturalized pasture presented the weakest one. Statistical and significant differences in methane fluxes were found between sites which may result from differences observed in [CH4] profiles and methane diffusion coefficients. [CH4] variation in the soil profile could be explained mainly by differences in silt and clay content and bulk density that affect CH4 soil diffusivity. Differences in these factors could be the resultof afforestation that seems to improve the physical and biological soil attributes linked to methane consumption as itmeliorates its diffusivity
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