Efecto de la cobertura vegetal y la producción de biominerales cálcicos sobre el ciclo biogeoquímico del calcio

NATALIA BORRELLI; FABRICIO OYARBIDE; MARGARITA OSTERRIETH; JORGE MARCOVECCHIO

Cáceres (España)

Congreso; “IX Congreso Iberoamericano de Física y Química Ambiental”; 2006

Asociacion Iberoamericana de Fisica y Quimica Ambiental

Abstract Effect of vegetation cover and production of calcium bio-minerals on calcium biogeochemical cycle. In the typical Argiudolls in the Southeast of the Pampean Plain, there has been described the presence of fungus calcium oxalate biominerals (whewellite and weddellite), but the production of these minerals by plants was no reported before. The aims of this work are: 1) to describe the presence of fungus and vegetal calcium biominerals; and 2) to analyze the role of these minerals on the calcium biogeochemical cycle in typical Argiudolls under different vegetation cover in the Southeast of Buenos Aires, Argentina. We studied the soil organic horizons, fungus, vegetal species and soil calcium concentrations in two plots with different vegetation cover (grass and eucalyptus trees). The plot with eucalyptus had depth organic horizons, and greater fungi and calcium oxalate crystals abundances than the grass plot. Thus, the eucalyptus plot had higher soil calcium concentration than in the grass plot (22-92 ppm and 9,6-19,2 ppm, respectively). Each plot had different amounts of calcium biomineral contents and soil calcium concentrations, explained by their vegetation cover rather than soil type.