ResumoO processo de ciclagem de nutrientes é importante para a sustentabilidade das formações florestais naturais e implantadas. Buscando contribuir com um melhor entendimento sobre esse processo, o objetivo deste estudo foi avaliar a ciclagem de nutrientes em um plantio puro de eucalipto com regeneração de espécies nativas em seu sub-bosque. Para o aporte e decomposição da serapilheira foram utilizados, respectivamente, coletores cônicos e litter bags. Posteriormente foram separadas as frações foliares de eucalipto (Corymbia citriodora) (EUC), regeneração nativa do sub-bosque (REG) e da fração controle com espécies de uma Floresta Estacional Semidecidual (FES). A seqüência do retorno de macronutrientes pelas folhas seguiu a mesma ordem para todas as frações foliares: N>K>P. As folhas de FES aportaram mais macronutrientes ao solo, enquanto EUC e REG aportaram a mesma quantidade. A degradação foliar foi mais elevada para FES, seguida da REG e do EUC. A velocidade de liberação de macronutrientes das folhas do EUC obedeceu a seguinte ordem: K>P>N. Enquanto para a FES e REG, o retorno foi na sequência: N>K>P e K>P>N, respectivamente. Esses resultados demonstram a importância da conservação da serapilheira nos ambientes estudados, principalmente na proteção e retorno de nutrientes para esses solos. Palavras-chave: Plantios homogêneos; material orgânica; serapilheira; aporte e decomposição de biomassa; conservação do solo. Abstract Nutrient cycling in the eucalyptus plantation with a regeneration of native species in understory.The nutrient cycling process is important for the sustainability of natural and planted forest formations. Therefore, the aim of this study was to evaluate the contribution of Nutrient cycling in the eucalyptus plantation with a regeneration of native species in understory. For deposition and decomposition of litter were used conical collectors and litter bags respectively. Subsequently were separated the foliar fractions of eucalyptus (Corymbia citriodora) (EUC), the native understory regeneration (REG) and a control with fraction of Semideciduous Forest species (FES). The sequence of the return of nutrients through the leaves followed the same order for all foliar fractions: N> K>P. The leaves of FES deposited more macronutrients on the ground, while EUC and REG contributed the same amount. The leaf degradation was higher for FES, then the REG and EUC. The rate of nutrients release from the EUC leaves followed the order K>P>N, while FES and REG this return following order N>K>P and K>P>N respectively. These results demonstrate the importance of litter conservation in the study site, especially in the protection and nutrient return of these soils. Keywords: Homogeneous plantations; organic material; litter input and decomposition of biomass; soil conservation. INTRODUÇÃOO aporte e a transformação da serapilheira são fundamentais para manutenção das propriedades dos solos tanto para florestas nativas quanto para os plantios de espécies exóticas comerciais (PINTO et al., 2008;SCHUMACHER et al., ...
In tropical forests, the stage of ecological succession influences the nutrient cycling. This study aimed to analyze soil fauna community structure, composition, and leaf litter decomposition in fragments of intermediate-successional and late-successional Submountainous Seasonal Semideciduous Forest (ISF and LSF, respectively). We used a square metal frame to collect 10 samples of the leaf litter layer and surface soil (0.00-0.05 m depth) from each area in the wet and dry seasons. Soil fauna individuals were then extracted using a modified Berlese-Tüllgren funnel. For analysis of leaf litter decomposition, 15 litter bags containing 30 g of senescent leaves were randomly placed on the forest floor of each area in the dry season, and three bags were collected after 60, 90, 120, 150, and 180 days. LSF presented higher value of richness and was more associated with Diptera and Formicidae. There was no clear pattern in evenness and diversity with successional stage. The dissimilarity between ISF and LSF in terms of soil fauna community was greater in the dry season. Litter decomposition was almost identical in both areas.
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