Chemical attributes and heavy metals in soils of urban forest remainings

• Autor(a) principal: Longo, Regina Marcia
• Data de Publicação: 2020
• Outros Autores: Ferreira, Denise Helena Lombardo, Silva, Alessandra Leite da, Penereiro, Júlio César, Regina Mendes, Deborah
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Revista Cerrados (Montes Claros. Online)
• Texto Completo: https://www.periodicos.unimontes.br/index.php/cerrados/article/view/1177
• topic: Heavy metals. Conservation of natural areas. Forest soil. Green areas. Urban forest remainings.; Metales pesados. Conservación de espacios naturales. Suelo forestal. Áreas verdes. Remanentes forestales urbanos.

Despite legislation that promotes the protection of certain relevant areas, such as conservation units, their edges are highly subject to external effects, known as the edge effect. This phenomenon is manifested by the alteration of the characteristics of vegetation, fauna and soil in this area. Therefore, the objective of this work was to quantify aspects of soil fertility and heavy metals: lead (Pb), chromium (Cr) and nickel (Ni) that may be present in the soil at the edges of the Forest of Santa Genebra, Campinas/SP, Brazil, in order to verify the interference of the different degrees of use and occupation of the surroundings. Soil samples were collected at 40 points on the edge of the fragment, equidistant in 200 m, and chemical analyzes of fertility and heavy metals were carried out. In the samples, the contents of: pH (CaCl2); organic matter (OM); phosphorus (P), potassium (K), calcium (Ca) and magnesium (Mg). The values of the cation exchange capacity (T) and base saturation (V%) were obtained through calculations. In the readings of the samples for the quantitative determination of the metals: lead (Pb), chromium (Cr) and nickel (Ni), Atomic Absorption Spectrophotometry (SAA) by flame atomization was used. After analyzing the results obtained, it can be seen that the remainder under study has conservation conditions in relation to the natural fertility of the soil that may come to assist in reforestation programs. However, some regions of the surrounding, mainly those that are under external pressure (urbanization, presence of roads and rural activities), presented changes in the levels of heavy metals under study.