Descomposición de especies dominantes del Bosque Serrano (Córdoba): efecto de la composición de especies en mezclas dobles

CUCHIETTI, ANIBAL; PÉREZ HARGUINDEGUY, NATALIA; GURVICH, DIEGO EZEQUIEL; CINGOLANI, ANA MARÍA

Huerta Grande, Córdoba, Argentina

Jornada; XVII Jornadas Científicas de la Sociedad de Biología de Córdoba; 2009

Sociedad Biología de Córdoba

Decomposition is a fundamental ecosystem process in which nutrients contained in vegetable material are liberated to the soil. There are evidences that decomposition of species in litter mixtures can differ from that of individually incubated species due to diverse mechanisms of interaction among the different species within the mixtures (priming effects, mining effects, among others). We analyzed if some of this mechanisms underlying synergic and antagonistic effects are operating in litter mixtures of dominant species from Córdoba montane woodlands. We found that the synergic and antagonistic effects did not relate significantly to the initial chemical quality of the species in the mixture, neither to the initial decomposition of the species of the mixtures. In relation to the mechanisms underlying these effects, some evidences indicate an influence of chemical secondary compounds in particular species. Other evidences reject the influence of the initial concentration of nitrogen in these effects (priming effects). For the analyzed species, and in the first stages of decomposition, the effects in litter mixtures would be idiosyncratic and dependent to presence of particular species more than of the initial decomposition, or the initial nitrogen concentration.