Afforested sites in a temperate grassland region: influence on soil properties and methane uptake
- 198 Downloads
Methane (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 soil 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 ng CH4 m−2 s−1; the naturalized pasture presented the weakest one. Intersite differences in CH4 fluxes may result from differences observed in [CH4] profiles and CH4 diffusion coefficients. [CH4] variation could be explained mainly by differences in silt and clay content and bulk density that affect CH4 soil diffusivity. These could be the result of afforestation that seems to improve the physical and biological soil attributes linked to CH4 consumption as it meliorates its diffusivity.
KeywordsMethane concentration profile Soils properties Methane diffusion coefficient Methane fluxes in soils
Financial support was provided by PICT 2010-1010 and PICT 2015-2540 of the National Agency for Scientific and Technological Research (ANPCyT) of the Ministry of Science, Technology and Innovation (MINCyT), Argentina.
- Del Grosso SJ, Parton WJ, Mosier AR, Ojima DS, Potter CS, Borken W, Brumme R, Butterbach-Bahl K, CrillP M, Dobbie K, Smith KA (2000) General CH4 oxidation model and comparisons of CH4 Oxidation in natural and managed systems. Glob Biogeochem Cycles 14:999–1019. doi: 10.1029/1999GB001226 CrossRefGoogle Scholar
- Hillel D (2006) Environmental soil physics. fundamentals, applications, and environmental considerations. Academic Press, New YorkGoogle Scholar
- INTA-CIRN (1989) Cartas de Suelos de la República Argentina, Instituto de Suelos. INTA, Buenos AiresGoogle Scholar
- Pazos MS (1984) Relación arcilla iluvial/arcilla total en molisoles del sudeste de la Provincia de Buenos Aires. Ciencia del Suelo 2:132–136Google Scholar
- Priano ME (2014) Gases de efecto invernadero: Mediciones de flujo en la interfaz suelo-atmósfera y sus concentraciones en el aire del suelo. Ph.D Thesis, Universidad Nacional del centro de la Provincia de Buenos Aires, Tandil, Buenos Aires, ArgentinaGoogle Scholar
- Schoeneberger PJ, Wysocki DA, Benham EC, Broderson WD (editors) (2002) Field book for describing and sampling soils, version 2.0. Natural Resources Conservation Service, National Soil Survey Center, Lincoln, NEGoogle Scholar
- Sistema de Apoyo Metodológico a los Laboratorios de Análisis de Suelos, Agua, Vegetales y Enmiendas Orgánicas (SAMLA) (2004) Guidelines for soil testing analysis.1st Ed. SAGPyA (Secretary of Agriculture and Fisheries). CD Rom. ISBN 987-918440-8Google Scholar
- Soil Survey Laboratory Staff (SSLS) (2004) Soil Survey Laboratory Methods Manual. Soil Survey Investigations Report No. 42. Version 2.5. USDA-NRCS, Washington, DCGoogle Scholar
- Soil Survey Staff (SSS) (2014) Keys to Soil Taxonomy. 12th Ed. USDA (United States Department of Agriculture)-NRCS (National Resources Conservation Services), Washington, DCGoogle Scholar
- Striegl RG, Proceedings of the NATO Advanced Research Workshop (1993) Diffusional limits to the consumption of atmospheric methane by soils. Chemosphere 26:715–720, ISSN 0045-6535. doi: 10.1016/0045-6535(93)90455-E