DSpace Coleção:http://repositorio.ufc.br/handle/riufc/3302026-06-09T22:38:31Z2026-06-09T22:38:31ZPotencial dendrocronológico e relações clima-crescimento em espécies de manguezalSilva, Mateus de Oliveirahttp://repositorio.ufc.br/handle/riufc/866112026-06-03T22:19:26Z2026-01-01T00:00:00ZTítulo: Potencial dendrocronológico e relações clima-crescimento em espécies de manguezal
Autor(es): Silva, Mateus de Oliveira
Tipo: Dissertação2026-01-01T00:00:00ZAnálise geoquímica de micronutrientes metálicos e aplicação de índices de risco ecológico em solos de áreas suscetíveis à desertificação no Jaguaribe, CearáOliveira, Eryc Jefferson Alves dehttp://repositorio.ufc.br/handle/riufc/864352026-05-27T18:19:56Z2025-01-01T00:00:00ZTítulo: Análise geoquímica de micronutrientes metálicos e aplicação de índices de risco ecológico em solos de áreas suscetíveis à desertificação no Jaguaribe, Ceará
Autor(es): Oliveira, Eryc Jefferson Alves de
Abstract: This study evaluated the availability of metals and the associated ecological risk in soils withdifferent degrees of degradation in a desertification-prone region in the municipality ofJaguaribe, Ceará State, Brazil. Three areas representing distinct stages of degradation wereselected: control area (CA), recovering area (RA), and degraded area (DA). In each area, threecomposite soil samples were collected at a depth of 0–20 cm, totaling nine samples. Eachsample was analyzed in triplicate in the laboratory to determine its physicochemical propertiesand the concentrations of B, Cu, Fe, Mn, Mo, Ni, and Zn. Metal concentrations were obtainedby partial acid digestion according to the EPA 3051A method and expressed as pseudo-totalconcentrations. Potential ecological risk was assessed using quantitative indices:Geoaccumulation Index (Igeo), Pollution Index (PI), Enrichment Factor (EF), and PollutionLoad Index (PLI). Statistical analyses were performed to evaluate the influence of independentvariables (soil degradation degree: DA, RA, and CA; and soil physicochemical attributes, suchas pH and organic matter) dependent variables corresponding to metal concentrations. Thisanalysis included normality tests, ANOVA, Kruskal-Wallis, and Spearman correlation. Ingeneral, soils from the degraded area showed lower concentrations of essential metals, exceptfor Fe, which presented higher levels in the degraded area, possibly due to the accumulation ofiron oxides in the clay fraction. Ecological risk indices indicated the absence of significantanthropogenic contamination, with values classified as non-polluted or minimally enriched.Significant correlations between Cu and B with organic matter, and between Ni and Zn withpH, suggest that the dynamics of these metals are strongly influenced by these soil attributes,affecting their availability and retention. The results obtained may support decision-makingregarding the management and recovery of degraded areas in semi-arid regions susceptible todesertification.
Tipo: Dissertação2025-01-01T00:00:00ZInfluência da restauração ecológica para sequestro de carbono em áreas tropicais semi-áridas submetidas a processos de desertificaçãoMoreno, Juan Guillermo Cadenahttp://repositorio.ufc.br/handle/riufc/846842026-02-10T14:33:00Z2024-01-01T00:00:00ZTítulo: Influência da restauração ecológica para sequestro de carbono em áreas tropicais semi-áridas submetidas a processos de desertificação
Autor(es): Moreno, Juan Guillermo Cadena
Abstract: The northeast of Brazil is facing desertification due to its semi-arid climate. This region is known for being one of the most populated in the world and for having a high poverty rate.This population depends on natural resources for their daily activities, and the misuse of resources such as cattle farming and deforestation of the caatinga is a growing problem in the semi-arid region. The aim of this study was therefore to identify the potential for restoring the caatinga biome through carbon and biomass stocks. In this work, three areas were analyzed (A- Degraded Area, B - Restoration Area, C - Test Area) in the municipality of Jaguaribe - CE,comparing physical and chemical soil attributes (indicators of fertility and nutrient availability, microbial activity - RBS) and calculating plant biomass based on stem diameter at ground level.The results indicate that the restoration area significantly improved its physical and chemical soil attributes in a way that did not differ statistically from the control area, which corroborates that ecological restoration is a nature-based solution to contribute to climate change mitigation and provide ecosystem services, such as carbon sequestration and biomass generation,beneficial to all species, including humans. The results indicate that the restoration area significantly improved its physical and chemical soil attributes in a way that did not differ statistically from the control area. In addition, the carbon stocks in the evaluated areas A = 9.10Mg ha-1, B = 15.16 Mg ha-1and C = 17.80 Mg ha-1increased considerably, which enabled revegetation and, consequently, biomass production B = 36.2 t ha-1and C = 43.8 t ha-1. Area A has no vegetation, which is why the biomass stock was not estimated. This corroborates that ecological restoration is a nature-based solution to help mitigate climate change and provide ecosystem services, such as carbon sequestration and biomass generation, which are beneficial to all species, including humans.
Tipo: Dissertação2024-01-01T00:00:00ZRelações clima-crescimento de uma espécie nativa e uma invasora ao longo de um gradiente de aridez: uma análise dendrocronológica buscando compreender o sucesso de invasãoNascimento, Sandro Ferreira dohttp://repositorio.ufc.br/handle/riufc/844302026-01-22T16:57:10Z2025-01-01T00:00:00ZTítulo: Relações clima-crescimento de uma espécie nativa e uma invasora ao longo de um gradiente de aridez: uma análise dendrocronológica buscando compreender o sucesso de invasão
Autor(es): Nascimento, Sandro Ferreira do
Abstract: The establishment of invasive species results in a reduction in native biodiversity. The invasiveness characteristics of the species and of the receptor ecosystems confer competitive advantages for invasive success in new introduction environments. The highly competitive capacity of invasive exotic species is attributed to their faster and greater growth (plasticity) compared to native species. However, the methodologies used may distort the interpretation that invasive species are superior competitors to native species, since measuring biomass at the end of the experiment does not consider how resource dynamics may affect species growth. Therefore, this study aimed to investigate the influences of climatic conditions on the growth performance of an invasive and a native species along an aridity gradient in the semi-arid domain of the Caatinga. To this end, we analyzed the growth rings of the invasive Cryptostegia madagascariensis and the native Cobretum leprosum, which are co-occurring species in the coastal region of the state of Ceará and have similar growth patterns. Subsequently, we analyzed the effects of local and regional climatic factors on the growth of both species. Both species showed annual growth rings. The populations had a short life cycle within the invaded community (ages ≤ 20 years). There are no differences between the growth of invasive and native species. However, the growth of species responded negatively to climatic factors. The native species is affected by rising temperatures along the gradient. El Niño negatively affects the growth of native species with greater intensity in all areas studied; for invasive species, its effects are felt only in the driest areas. Through the annual growth rings of the species, we found that local environmental conditions do not greatly influence the growth of the invasive species, but reduce the growth of the native species with increasing temperatures, highlighting the plasticity of the invasive taxon.
Tipo: Dissertação2025-01-01T00:00:00Z