relação dos incêndios com as propriedades físicas, químicas e mineralógicas do solo em São Pedro da Serra Nova Friburgo/RJ

• Autor(a) principal: Mattos, Bruno Souza de
• Data de Publicação: 2018
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/13460
• topic: Fire; Influence of fire on the soil; Soil properties; Incêndios; Influência do fogo no solo; Propriedades do solo; CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOGRAFIA FISICA

Fires are phenomena characterized by fire of great intensity and magnitude, causing each system to seek to respond to this disturbance according to the elements present in a given landscape. In the district of São Pedro da Serra - Nova Friburgo / RJ, fire is an element commonly used by farmers to promote cutting and burning agriculture. However, in some cases this technique, which is based on the use of fire in a controlled manner and with low intensity, may accidentally provide the appearance of fires. Since the district is located within the Environmental Protection Area (APA) of Macaé de Cima, it is necessary to carry out studies aimed at understanding the evolution of landscapes from the use of fire. This work aimed to use the physical, chemical and mineralogical properties of the soil of burned areas as a way to contribute to the understanding of this process of landscape evolution. Soil samples were collected on two distinct slopes located in the São Pedro sub-basin. The point A1 (Located in the region of Benfica) and Area 2 Located in the region of Bocaina of the Blaudt). The fires occurring in both areas present distinct temporalities, while in Area 1 it dates from 2 years ago, in Area 2 the event occurred approximately 7 years ago. Samples of undisturbed soil were collected at depths of 0-5, 5-10, 10-15, 15-20 and 20-25 cm. The results show the presence of clayey soils, with the occurrence of kaolinite, gibbsite, muscovite, microline and quartz in the clay fraction of the two areas. The soils of Area 1 have a higher pH compared to Area 2. The thermogravimetric curves behave homogeneously when the soil samples are compared by depth. However, they present different results when comparing the data of each of the slopes. The repellency data show that even after 7 years it is still possible to find moderate repellency in the initial 5 cm of Area 2, while in Area 1, even though it has suffered a fire effect more recently, no type of soil repellency was found.