O uso intensivo do solo por períodos prolongados promove alterações em suas propriedades físicas, reduzindo a estabilidade de seus agregados e aumentando sua vulnerabilidade aos processos erosivos. A agregação do solo tem sido utilizada como indicador de sua qualidade física porque é uma propriedade sensível a alterações do solo. Esta é uma realidade quando o solo é cultivado intensivamente e por períodos longos, mas existem poucos dados para alterações em cultivos recentes e quanto tempo pode levar para se regenerar. O objetivo deste trabalho foi determinar alterações na estabilidade de agregados de uma área com pouco tempo de cultivo e sua capacidade de regeneração, numa topossequência de Argissolo Vermelho Amarelo, sob diferentes usos, utilizando como indicadores o Diâmetro Médio Ponderado (DMP) e o Diâmetro Médio Geométrico (DMG).  O solo foi amostrado em três posições de uma área de encosta com mata preservada, mata em regeneração há quatro anos e cultivos recentes, máximo de três anos. A estabilidade de agregados do solo foi analisada após o peneiramento em malhas de 2,00, 1,00, 0,50 e 0,25 mm para a determinação do peso e valores do Diâmetro Médio Ponderado (DMP) e Diâmetro Médio Geométrico (DMG). O manejo agrícola do solo levou a alterações na estabilidade dos agregados e nos teores de matéria orgânica, mesmo com pouco tempo de cultivo, confirmando dados da literatura de que estas características são sensíveis ao manejo do solo. Por outro lado, a similaridade dos dados entre a área sob a mata preservada e a mata em regeneração há quatro anos, indica que este solo é capaz de recuperar suas propriedades aos níveis iniciais, em curto período, desde que cessem as práticas agrícolas convencionais e seja mantido numa condição de preservação.Palavras-chave: Estabilidade, Agregados, Erosão, Estrutura. Aggregate stability of soil in a toposequence under different uses A B S T R A C TThe intensive use of soils for long periods promotes changes in their physical properties, reducing the stability of their aggregates and increasing their vulnerability to erosive processes. Soil aggregation has been used as an indicator of its physical quality because it is a sensitive property to soil changes. This is true when the soil is cultivated intensively and for long periods, but there is little data for soil changes in recent crops and how long it may take to regenerate. The objective of this work was to determine changes in the stability of aggregates in an area with recent cultivation and its regeneration capacity, in a Red Yellow Argisol toposequence, under different uses, using the Weighted Mean Diameter (DMP) and Mean Diameter Geometric (DMG) as indicators. The soil was sampled in three positions in a hillside area with preserved forest, forest in regeneration for four years and recent crops, maximum of three years. The stability of soil aggregates was analyzed after sieving in meshes of 2.00, 1.00, 0.50 and 0.25 mm to determine the weight and values of Weighted Mean Diameter (DMP) and Geometric Mean Diameter (DMG). Agricultural soil management led to changes in aggregate stability and organic matter levels, even with a short period of cultivation, confirming literature data that these characteristics are sensitive to soil management. On the other hand, the similarity of the data between the area under the preserved forest and the forest in regeneration for four years, indicates that this soil can recover its properties to initial levels, in a short period, if conventional agricultural practices cease and be kept in a condition of preservation.Keywords: Stability, Aggregates, Erosion, Structure.

Knowing particularities of soils allows the adoption of sustainable management practices. The most efficient method to obtain data on the soil is through its characterization, essential for planning land use and soil conservation. However, soil surveys conducted in the conventional methods are costly and time-consuming. This study aimed to identify spectral patterns in the mid-IR wavelengths for a quick and low cost characterization of soil classes. Soils from the Natuba river basin, Pernambuco State, Brazil, were used. These soils were mapped on a scale of 1:25,000, where the presence of Latossolos, Argissolos, Gleissolos and Neossolos were identified. The data of reflectance for profiles of each soil class were collected using the spectral range between 2,500 and 25,000 nm. In the mid-IR region, Latossolos and Argissolos presented spectral characteristics peculiar to classification criteria. The increased contents of organic matter and iron oxides reduced soil reflectance. The horizons with sand content above 80% showed strong absorption spectra and significant reflectance peaks of quartz in the mid-IR. The wavelengths 2,681, 2,600 and 2,495 cm -1 occurred only in these horizons. The spectral analysis presented as a high-potential method for the characterization and classification of soils.

Commonly geodiversity is associated with geological knowledge, leaving aside others abioticcomponents such as geomorphological, pedological and hydrological. Geodiversity, compared tobiodiversity, does not yet have the same prestige and political position. In the Brazilian semiaridregion, there are still many gaps related to the knowledge of geodiversity. In 2022, the SeridóGlobal Geopark was recognized by UNESCO as a territory that provides an intriguing insight intothe Earth’s history through its unique natural landscape, cultural and culinary history. Among themunicipalities inserted in the territory of the Seridó Geopark is Acari-RN, which has richgeodiversity. The objective of this work was to present an integrated analysis of the geodiversityof the municipality of Acarí-RN, encompassing information related to variety of geological,geomorphological, pedological and hydrological features and processes. Fieldwork was carriedout, we identified and mapped landforms and their physiognomic aspects and georeferenced usingportable GPS. We collected soils to represent the different landforms. A ten geosites werecharacterized in the municipality, four of them belonging to the Seridó Geopark, in which we alsosought to consider the information about the relief and soils. In the present work, the term"integrated analysis of geodiversity" was used in order to encourage debate and to make it clearthat geodiversity is not limited to geological aspects. The integrated analysis of geodiversity canbe a subsidy for geotourism, regional valorization of the semiarid and also preservation of theCaatinga biome. The identification and characterization of potential geosites in Acarí-RN canhelp for developing efficient municipal policy to combining the conservation of their uniquegeological heritage with public outreach and sustainable development