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.
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
The Brazilian semiarid region is an environmentally fragile that suffers from deforestation and land degradation. In the sustainable development debate, it's essential integrating sustainability into geoscience education and training. In order to have sustainable development, it is necessary to sensitize people about the functioning of environmental dynamics, considering not only biotic factors, abiotic and biotic factors work together to create a ecosystem. Environmental Education offers objective instruments to elaborate and re-elaborate personal beliefs, values, attitudes and behaviour. We aimed to analyse and discuss how geoscience and environmental education can work together to environmental conservation and preservation in the Brazilian semiarid region. The study was conducted in the Private Reserve of Natural Heritage Olho d'água das Onças (Picuí-PB) in the Northeast of Brazil. Geomorphological, geological and pedological characterizations of the study area were carried out, in order to discuss the processes involved and understand the semiarid dynamics. Our results show two distinct environments with contrasting dynamics: the flat tableland domain with Latossolo Amarelo and edge of tableland with Neossolo Litólico. Environmental educational practices in the semiarid region need to take a holistic approach with interconnected environment (abiotic and biotic). It is essential to understand and discuss the processes, especially in relation to erosion and siltation processes, which generate different impacts with economic and social consequences. It is noteworthy that Environmental Education must be assumed as an educational process of continuous training, regardless of age and location. Knowing the dynamics of the physical environment of the semiarid is of paramount importance in order to avoid land degradation and restoring degraded lands.
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