University of Prešov in Prešov, Department of Ecology, Faculty of Humanities and Natural Sciences, 17, November 1, Prešov 080 01, Slovakia.
Universidade Federal de Uberlândia, Instituto de Ciências Agrárias, Campus Glória, Bloco CCG, 38410-337 Uberlândia, MG, Brazil.
An Acad Bras Cienc. 2021 Sep 20;93(suppl 3):e20201906. doi: 10.1590/0001-3765202120201906. eCollection 2021.
Land use systems have a great impact on soil function and microbial diversity in tropical soils. Our study aimed to evaluate soil biochemical indicators and community composition and to assess the relationship between soil biochemical and microbial indicators and bacterial diversity of three agroecosystems (pine forest, soya and sugarcane) and native Cerrado forest in the Brazilian savanna. Soil biochemical indicators (soil organic matter and enzymes) and high-throughput sequencing of 16S rDNA were performed in two topsoil depths (0-5 cm and 5-10 cm). Soil microbial and enzyme activity showed that agricultural soil usage has a negative impact on soil function compared to native and pine forests. Results also revealed higher enzyme activities in 0-5 cm depth compared to 5-10 cm depth, but enzymatic activities depend on land use systems. Soil bacterial community was affected by land use systems and depth, revealing changes in structure and abundance of bacterial composition. Alpha-diversity indexes were higher in the agricultural systems than in the forests, however they showed a significant negative correlation with most of the studied soil microbial and biochemical indicators. Our research had brought new relevant information about the relationship between the soil biochemical indicators and the bacterial diversity in the Brazilian Cerrado.
土地利用系统对热带土壤的土壤功能和微生物多样性有很大影响。我们的研究旨在评估三种农业生态系统（松林、大豆和甘蔗）和巴西热带稀树草原原生塞拉多森林的土壤生化指标和群落组成，并评估土壤生化和微生物指标与细菌多样性之间的关系。在两个表土层深度（0-5cm 和 5-10cm）进行了土壤生化指标（土壤有机质和酶）和 16S rDNA 的高通量测序。与原生林和松林相比，农业土壤的使用对土壤功能有负面影响。结果还表明，与 5-10cm 深度相比，0-5cm 深度的酶活性更高，但酶活性取决于土地利用系统。土壤微生物群落受土地利用系统和深度的影响，揭示了细菌组成的结构和丰度的变化。农业系统的α多样性指数高于森林，但与大多数研究的土壤微生物和生化指标呈显著负相关。我们的研究提供了有关巴西塞拉多土壤生化指标与细菌多样性之间关系的新信息。
