Fauna epiedáfica associada a fragmentos florestais de Araucaria angustifolia em diferentes condições edafoclimáticas no estado do Paraná

Abstract

A fauna edáfica desempenha funções ecológicas fundamentais na interface solo-serapilheira, sendo dependente das condições ambientais que está inserida. Neste sentido, este estudo objetivou avaliar a diversidade de organismos epiedáficos em fragmentos florestais de Araucaria angustifolia na região Sudoeste do Paraná sob diferentes condições edafoclimáticas. A amostragem da fauna foi realizada em três áreas com diferentes condições edafoclimáticas, em função da variação da altitude, nos municípios de Dois Vizinhos, Pato Branco e Mangueirinha, Sudoeste do PR. Instalou-se oito armadilhas de queda em cada fragmento que permaneceram a campo por um período de sete dias. Os organismos amostrados foram identificados com auxílio de lupa binocular e chaves dicotômicas de classificação. Em cada ponto de coleta também amostrou-se o solo na camada de 0-10 cm para avaliação dos atributos químicos do solo. As diferentes condições edafoclimáticas na região Sudoeste do Paraná não afetam significativamente a abundância, riqueza e a diversidade de organismos epiedáficos associados a fragmentos florestais de Araucaria angustifolia. Porém, a temperatura interferiu na dinâmica de decomposição da matéria orgânica do solo. Epiedaphic fauna associated with Araucaria angustifolia forest fragments in different edaphoclimatic conditions in the state of Paraná A B S T R A C TThe edaphic fauna plays fundamental ecological functions in the soil-litter interface, being dependent on the environmental conditions that are inserted. In this sense, this study aimed to evaluate the diversity of epiedaphic organisms in forest fragments of Araucaria angustifolia in the Southwest region of Paraná under different edaphoclimatic conditions. The fauna sampling was carried out in three areas with different edaphoclimatic conditions, depending on the altitude variation, in the municipalities of Dois Vizinhos, Pato Branco and Mangueirinha, Southwest of PR. Eight drop traps were installed in each fragment that remained in the field for a period of seven days. The sampled organisms were identified with the aid of a binocular loupe and dichotomous classification keys. At each collection point, the soil was also sampled in the 0-10 cm layer to assess the chemical attributes of the soil. The different edaphoclimatic conditions in the Southwest region of Paraná do not significantly affect the abundance, richness and diversity of epiedaphic organisms associated with forest fragments of Araucaria angustifolia. However, the temperature interfered in the decomposition dynamics of the soil organic matter.Keywords: soil biota, Atlantic Forest, invertebrates, bioindicators

Physical Quality of Soils in a Toposequence of a Forest Fragment under Livestock Activity in a Watershed in South Brazil

“…Thus, the decompaction of forest soil is largely influenced by the intense and constant activity of edafica fauna and woody plants with a large volume of the root system. Edaphic organisms, mainly microorganisms, have an important role to decompile biomass produced in the different strata of the forest and deposited in the litter, which is incorporated into soil organic matter and promotes better conditions in physical attributes, such as aggregation, porosity, and rate of water infiltration, energy flow, as well as chemical attributes such as nutrient cycling and increased cation exchange capacity [38] in forest soils. Since then, soil density has been an indirect environmental indicator of the degree of particulate ness.…”