Decomposição e Atividade Microbiana da Serapilheira em Coberturas Florestais no Sul do Espírito Santo

Abstract

RESUMOO processo de decomposição de serapilheira deve ser amplamente estudado por se tratar de um fator-chave na manutenção e ciclagem de nutrientes nos ecossistemas. Este estudo teve como objetivos: avaliar a decomposição, a liberação de nutrientes e a atividade microbiana da serapilheira em coberturas florestais de floresta secundária, Acacia mangium, Sapindus saponaria e Hevea brasiliensis, no sul do Espírito Santo. A decomposição da serapilheira e a liberação de nutrientes foi quantificada por meio de litter bags. Para a avaliação da atividade microbiana procedeu-se à quantificação do carbono mineralizável por meio da evolução de CO 2 . Os resultados mostraram que as coberturas florestais se comportaram de forma diferenciada quanto à decomposição e atividade microbiana, destacando-se a Sapindus saponaria, que apresentou maior velocidade de decomposição de serapilheira. A cobertura de Sapindus saponaria apresentou quantidades acumuladas de CO 2 superiores às demais. A cobertura de Acacia mangium apresentou os menores valores de CO 2 acumulado.Palavras-chave: ecossistema florestal, ciclagem de nutrientes, microrganismo. Decomposition and Microbial Activity of Forest Floor Litter in the South of Espírito Santo ABSTRACTThe decomposition process of litter should be widely studied, as it is a key factor for nutrient maintenance and cycling in ecosystems. This study aimed to evaluate the decomposition, release of nutrients, and microbial activity of the forest floor litter of secondary forest, Acacia mangium, Sapindus saponaria, and Hevea brasiliensis in the south of Espirito Santo. The litter decomposition and nutrients release was measured by means of litter bags added to each forest cover. For the assessment of microbial activity, we quantified mineralizable carbon by CO 2 evolution. The results showed that the forest covers behaved differently in terms of decomposition and microbial activity; particular emphasis is given to Sapindus saponaria, which presented a faster decomposition of litter. The cover of Sapindus saponaria also presented higher amounts of accumulated CO 2 compared to other forest covers; whereas the cover of Acacia mangium presented the lowest values of accumulated CO 2 .

Decomposition of Leaf Litter in Semideciduous Submontane Forest, in The Southern State of Espírito Santo

“…The decomposition curve obtained, with initial peak and subsequent smoothing, followed negative exponential simple model. Similar results were also verified by Silva et al (2013) and Grugiki et al (2017) in Atlantic Forest in southern state of Espírito Santo. Guimarães et al (2009) and Sena et al (2015) reported that nonlinear models are the best to describe biological parameters, since these parameters have hardly linear behavior.…”

“…The monitoring of litter decomposition in litterbags showed that the leaf decomposition rate observed in the period under study is in accordance with that estimated by Anderson et al (1983) in neotropical forests, which varies from 1.1 to 1.7. However, the value Gomes Júnior D, Caldeira MVW, Klippel VH, Mendonça ES, Delarrmelina WM, Godinho TO et al found is above that observed by Silva et al (2013) and Grugiki et al (2017), both in Seasonally Dry Tropical Forest and in the secondary succession stage in Southern state of Espirito Santo. These variations are expected, since there is no homogeneity among tropical forest fragments in their attributes, either edaphic, climatic or biological.…”

“…Also in southern state of Espírito Santo, Grugiki et al (2017) conducted a study with the objective of evaluating the decomposition and release of nutrients and microbial activity of leaf litter in forest cover of Acacia mangium, Sapindus saponaria, Hevea brasiliensis, and secondary forest. The authors found greater initial leaf litter decomposition in secondary forest and reported that this fact can be explained by the diversity of plant species, which influences the decomposition process since it affects the quality of the substrate (leaves and roots, mainly), the decomposition environment (microclimate) and, thus, the activity of the decomposing community.…”

Litter as an Ecological Indicator of Forest Restoration Processes in a Dense Ombrophylous Lowland Forest

“…Although treatments were composed of different amount of species, the proportion of successional groups was the same for all treatments. The amount of litter on the soil surface can vary depending on the composition of species, successional stage, and intensity of forest cover (Caldeira et al, 2008;Grugiki et al, 2017). Therefore, the use of the same proportion of successional groups in the present study might have caused a similar response in the analyzed treatments.…”

Fauna epígea associada à fragmentação de folhedo de espécimes de <em>Paubrasilia echinata</em> Lam. (pau-brasil)

“…Tratamentos k (g g -1 dia) t Avaliando a decomposição da serapilheira foliar, Pinto et al (2016) estimaram tempo de meia-vida de aproximadamente 433 dias. Já Grugiki et al (2017), quantificaram para Acacia mangium um tempo de meia-vida de aproximadamente 497 dias. Essa diferença nos resultados está relacionada aos fatores como a fauna e condições ambientais do local.…”