Associações micorrízicas arbusculares em Araucaria angustifolia em diferentes condições edafoclimáticas no sudoeste do Paraná

Abstract

Araucaria angustifolia is the main native tree species representative of the Araucaria Forest, found in the Southeast and South of Brazil. This species grows in soils with variable fertility. When inserted in low fertility soils, chooses to associate with fungi in the soil. This association is of the non-pathogenic and performed with mycorrhizal fungi. This study aimed to evaluate the arbuscular mycorrhizal associations in Araucaria angustifolia under different soil and climatic conditions in southwestern Paraná, in three municipalities with varied climatic and soil characteristics in southwestern Paraná region 8 Araucaria individuals of varying sizes of and root samples were collected in and samples of soil (0-10 cm) from 6 sub-samples at distances of 4 and 2 m from the center of the trunk. In soils laboratory of the Federal Technological University of Paraná, Campus Two Neighbors evaluated the root colonization, spore count in the soil was characterized chemically soil and evaluated respirometry, carbon and nitrogen of microbial biomass. Data were subjected to analysis of variance and when significant Tukey test at 5% probability. The altitude interfere with the dynamics of decomposition of soil organic matter in southwestern Paraná Region, also affecting other biogeochemical processes of the soil, such as high acidity and decreased availability of nutrients and increases the microbial activity in the soil, represented by respirometry C and N of microbinana biomass. The occurrence of mycorrhizal fungi associated with Araucaria angustifolia roots varied according to the different soil and climatic conditions in Paraná Southwest, mainly due to the SOM content and soil acidity.