In compliance with the provisions of art. 6 of DECISION 001/76, the DOCTORAL THESIS entitled INTERRELATIONSHIP AMONG SOIL ORGANIC CARBON STOCK, PHYSICOCHEMICAL, MINERALOGICAL AND HYDRAULIC PROPERTIES IN URBAN ENVIRONMENT by student MELISSA CASACCHI ANTUNES, candidate for the degree of Doctor in Civil Engineering, will be defended on September 24, 2025, at 13:00 p.m., in a meeting held by remote communication means.
Date: 24 September 2025
Working Hours13h00
Virtual Room:
https://puc-rio.zoom.us/j/97925042795?pwd=JoiyqEB8ilIPa2q8S4cGI8V1X3Q2gd.1
Meeting ID: 979 2504 2795
Password: 898664
Summary: Soil is at the center of ecological solutions. Soil organic carbon stock (Cstock) is the indicator used to assess soil degradation and to monitor restoration. This study determined the Cstock and investigated its interrelations with oil's physicochemical, hydraulic and mineralogical properties across three classes of land use and cover in the city of Rio de Janeiro: non-native vegetation forest (NNF), dense lojaphylous forest in the initial stage (FIS), and bare oil fill (BSF). The investigation was conducted in 20 cm sections to 1 m in the soil profile. The Cstocks within the 1 m deep profile in the NNF and FIS areas are similar and nearly 38% higher than in the BSF area. In contrast, the BSF presented a higher Cstock in the underground. However, the NNF area exhibited higher stock in the persistent form of soil organic matter (MCstock). The soil dry density has a high influence on the Cstock and must be carefully determined in highly heterogeneous urban soil profiles. Soil properties presented similarities and dissimilarities between soil profiles; however, statistical analysis revealed significant differences among the three areas studied. Correlations between Cstock and geotechnical parameters did not present strong significance when considering all profiles, although they were representative in more homogenous material. Further investigation is required to increase the statistical dataset and confirm correlations. At the end, it is shown that the soil physicochemical, mineralogical and hydraulic characteristics of each land use and cover class in Rio de Janeiro may affect their potential for Cstock.
