O Planalto da Ibiapaba representa uma megaforma de relevo, do tipo microrregional. O presente artigo analisa a borda desse relevo no Estado do Ceará, onde a Bacia do Parnaíba, que sustenta o planalto, faz contato com o embasamento cristalino. Seguindo as técnicas analíticas da Geomorfologia Estrutural e da Megageomorfologia, que incluem longos intervalos de tempo para áreas de expressão espacial importante, definimos a existência de dois tipos diferentes de contatos: glint tipo 1, onde ocorrem rochas cristalinas na vertente do relevo homoclinal e na depressão periférica (ao norte), e glint do tipo 2, no qual apenas a depressão periférica é mantida por rochas do embasamento cristalino (segmentos central e meridional). Foi ainda definido um contato do tipo “glintóide”, caracterizado pela ocorrência de depressão periférica cristalina movimentada, expondo relevos do tipo maciços (no extremo noroeste), e um segmento tabuliforme em superfície (cuestiforme na estrutura). Feições de menor escala, como quedas d’água em rios anaclinais (Bica do Ipu) e superimposição por rios cataclinais (Cânion do Rio Poti) foram também analisadas. Trata-se de um estudo introdutório inédito da totalidade do Planalto da Ibiapaba, que indica os caminhos de aprofundamento no futuro.
As sucessivas mudanças ambientais estão representadas por registros com interações de fatores e processos intensos na evolução da paisagem. Deste modo, a caracterização e análise da paisagem é ferramenta essencial no conhecimento dessas mudanças. Este trabalho realizou o cruzamento de diversos dados ambientais e informações espaciais de gênese de solos, por meio de trabalhos de campo, como coleta de solo e rocha e análise da paisagem, para fi ns de caracterização das unidades fi siográfi cas da região Norte do Estado do Ceará (Brasil). Esta região é caracterizada por unidades policíclicas de origem marinha, paleo-marinha, paleo-fl uvial e fl uvial. As unidades fi siográfi cas estudadas neste trabalho estão desenvolvidas a partir do Grupo Serra Grande, Formação Barreiras e sedimentos inconsolidados. A região é drenada pelo rio Acaraú e marcada pela presença de afl uentes controlados por falhas e lineamentos, associadas à ocorrência de rochas graníticas e areníticas da Formação Ipú e Formação Barreiras que favorecem o desenvolvimento de uma topografi a escalonada e padrão de drenagem subdendrítica do rio Acaraú.
The consumption of healthy foods is essential for nutrition and quality of human life. Thus, family farming is responsible for the production of organic food, since the people who inhabit urban centers depend on this sustainable production. In addition, the spatial clipping of the research is situated on the backcountry surface, in the semi-arid northeast. The community of São Domingos, is located 25 km from the municipality of Sobral- Ceará. The aim of the study is to characterize the agroecological systems of consumption and production (PAIS and Mandala) and to present their multiple uses, and commercial flows in the sale of cultivated products. It is concluded that agroecological systems are a source of income that fosters the local economy and helps in the healthy diet of people who consume the cultivated fruits.
Erosion pins are considered a simple and inexpensive way to estimate soil losses due to erosion and have been used in different environments with different degrees and types of erosion. Despite the advantages of this technique, there is a shortage of studies that demonstrate how data systematization and soil loss calculations are performed using this technique. Therefore, this study aimed to present the step-by-step data systematization process of erosion pins obtained in the field and the calculation of soil losses, with the measurement of soil losses under the effect of hydrogel. Readings from 16 pins installed in an area cultivated with soursop trees planted on contour lines and associated with stone rows were monitored weekly between 19/02 and 19/03/2022 by measuring the distance between the soil surface and the end of each pin. The readings were organized by pin and date of measurement. Subsequently, soil lowering and burial, soil density, useful area of each pin, and soil loss in kg/m3 and Mg/ha-1 were determined, enabling statistical analysis and technical interpretation of the data.
Agriculture, to be successful, needs soil to have a potential nutrient composition that is relevant to plants. Therefore, it is necessary to identify the conditions for farming through soil analysis. Thus, this manuscript makes it possible to analyze the fruitfulness of two samples of the reddish-yellow acrisol—one with vegetation and the other without it—from Serra da Meruoca, a humid area in the semi-arid region of Ceará. Concerning the material and method, the stages were literature review, researches on cartographic bases, fieldwork, and data collection and their analysis in the laboratory. The results show that the area of acrisol with vegetation favors the practice of agriculture, a fact observed because of carbon (C), which is indicative of soil with intense cultivation, as well as calcium (Ca), which appeared in a significant level, typical of arable land. In the second sample, the acrisol without vegetation, the parameters that impose restrictions on agriculture are the pH, which contains exchangeable aluminum, indicative of high acidity that leads to a leaching process. Also, the aluminum (Al) at a low level reflected the need for dolomitic quicklime, for the amendment of a deficient soil. Therefore, studies on its fruitfulness are essential for farmers to reap the rewards according to the results obtained and analyzed.
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