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You searched for +publisher:"Universidade Federal do Ceará" +contributor:("Eunice Maia de Andrade"). Showing records 1 – 2 of 2 total matches.

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1. Ellen Cristina Dantas de Carvalho. A arquitetura hidrÃulica explica a ocorrÃncia e a abundÃncia de lianas em ambientes semiÃridos?.

Degree: PhD, 2014, Universidade Federal do Ceará

O sucesso de lianas em florestas tropicais sazonalmente secas à explicado por uma vantagem competitiva em relaÃÃo Ãs demais formas de crescimento. Lianas possuem sistema hidrÃulico eficiente, com vasos largos e compridos, e raÃzes profundas que conseguem absorver Ãgua das camadas mais profundas do solo, garantindo a fixaÃÃo de carbono e a manutenÃÃo de altas taxas de crescimento durante o perÃodo seco. Em ambientes semiÃridos, a ocorrÃncia e a abundÃncia de lianas sÃo menores, podendo ser considerado o extremo seco de distribuiÃÃo dessa forma de crescimento. NÃs acreditamos que o sistema hidrÃulico eficiente de lianas à bastante vulnerÃvel a cavitaÃÃo induzida por seca em ambientes Ãridos e semiÃridos, o que diminuiria a capacidade competitiva. Entretanto, evidÃncias empÃricas que suportem essa ideia sÃo marcadamente escassas. Nosso principal objetivo foi analisar se as caracterÃsticas morfofisiolÃgicas do sistema hidrÃulico, a dinÃmica foliar e as relaÃÃes hÃdricas foliares podem explicar a ocorrÃncia e a abundÃncia de lianas em ambientes semiÃridos. No capÃtulo 1, analisamos a arquitetura hidrÃulica do xilema ao longo do contÃnuo raiz-caule-ramos de trÃs lianas congÃneres que ocorrem com abundÃncias contrastantes em duas Ãreas semiÃridas com diferenÃas nas caracterÃsticas estruturais dos solos e no dÃficit de pressÃo de vapor do ar (VPDar). Mensuramos a densidade da madeira (DM), Ãrea da secÃÃo transversal ocupada por parÃnquima (AP), fibras (AF) e vasos (AV), densidade de vasos (N), diÃmetro mÃdio (d) e mÃximo (dmÃx) dos vasos, diÃmetro das pontoaÃÃes das paredes dos vasos (dpit), densidade de pontoaÃÃes (Npit), diÃmetro hidrÃulico (Dh) e condutividade hidrÃulica potencial (Kp) em ramos, caule e raiz. Evidenciamos que as lianas apresentaram duas zonas de seguranÃa hidrÃulica, uma nas raÃzes e outra nos ramos, diferindo do usualmente descrito para Ãrvores cuja seguranÃa hidrÃulica à crescente das raÃzes aos ramos. Nossos resultados indicaram que a diminuiÃÃo da Kp e o aumento da seguranÃa hidrÃulica nos ramos e raÃzes demonstraram haver convergÃncia funcional entre as trÃs espÃcies. No capÃtulo 2, comparamos a profundidade do sistema radicular, a dinÃmica foliar, o potencial hÃdrico foliar sazonal (Ψleaf) e a resistÃncia à cavitaÃÃo (P50) entre as espÃcies, principais caracterÃsticas que sÃo utilizadas para explicar o padrÃo de distribuiÃÃo e abundÃncia de lianas. Os nossos resultados sÃo contrastantes com o comumente descrito para lianas. Em sÃntese, evidenciamos que, todas as espÃcies, apresentaram raÃzes superficiais, alta variaÃÃo no potencial hÃdrico foliar na madrugada (Ψpredawn) entre os perÃodos chuvosos e seco, deciduidade foliar em resposta ao estresse hÃdrico do solo e ao VPDar e maior resistÃncia à seca (P50). A maior resistÃncia à cavitaÃÃo e a deciduidade foliar aumentam a resistÃncia à seca nas lianas, porÃm limitam a fixaÃÃo de carbono ao perÃodo chuvoso. Uma vez que suas raÃzes sÃo superficiais, e a deciduidade foliar impede o ganho de carbono e o crescimento durante o perÃodo seco,… Advisors/Committee Members: Eunice Maia de Andrade, SebastiÃo Medeiros Filho, Everardo Valadares de Sà Barretto Sampaio, Jullyana Cristina MagalhÃes Silva Moura Sobczak, Francisca Soares de AraÃjo.

Subjects/Keywords: ECOFISIOLOGIA VEGETAL; Xilema; Densidade da madeira; Condutividade hidrÃulica potencial; ResistÃncia à seca; Deciduidade foliar; Vulnerabilidade à cavitaÃÃo; Xylem; Wood density; Potential hydraulic conductivity; Drought resistance; Leaf fall; Vulnerability to cavitation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Carvalho, E. C. D. d. (2014). A arquitetura hidrÃulica explica a ocorrÃncia e a abundÃncia de lianas em ambientes semiÃridos?. (Doctoral Dissertation). Universidade Federal do Ceará. Retrieved from http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=13598 ;

Chicago Manual of Style (16th Edition):

Carvalho, Ellen Cristina Dantas de. “A arquitetura hidrÃulica explica a ocorrÃncia e a abundÃncia de lianas em ambientes semiÃridos?.” 2014. Doctoral Dissertation, Universidade Federal do Ceará. Accessed May 07, 2021. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=13598 ;.

MLA Handbook (7th Edition):

Carvalho, Ellen Cristina Dantas de. “A arquitetura hidrÃulica explica a ocorrÃncia e a abundÃncia de lianas em ambientes semiÃridos?.” 2014. Web. 07 May 2021.

Vancouver:

Carvalho ECDd. A arquitetura hidrÃulica explica a ocorrÃncia e a abundÃncia de lianas em ambientes semiÃridos?. [Internet] [Doctoral dissertation]. Universidade Federal do Ceará 2014. [cited 2021 May 07]. Available from: http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=13598 ;.

Council of Science Editors:

Carvalho ECDd. A arquitetura hidrÃulica explica a ocorrÃncia e a abundÃncia de lianas em ambientes semiÃridos?. [Doctoral Dissertation]. Universidade Federal do Ceará 2014. Available from: http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=13598 ;

2. LÃcio Resende Pereira JÃnior. Structure and carbon stock in caatinga vegetation: a case study in an area with 30 years of regeneration.

Degree: PhD, 2016, Universidade Federal do Ceará

Studies aimed at characterizing the role of drought across forests to climate change correlated with the vegetation conservation stage are important for participation as mitigating the effects of climate change can be assessed as well as its role in the global carbon balance. In this sense, the objective was to quantify the carbon storage and fixation of CO2 eq. the components: the woody, herbaceous, leaf litter and roots in a caatinga fragment in 30 years of fallow. The study was conducted in a caatinga fragment with 1 hectare of territorial unit. selected were all individuals who had Perimeter Ground Level (PNS) ≥ 9 cm and height ≥ 1 m. To characterize the vegetation structure we evaluated the frequency, density and dominance, importance value index and coverage of the individuals. Subsequently, the biomass was estimated, using allometric equations; in sequence, the stored carbon was quantified. The stock of carbon in the litter and in herbaceous plants was determined by monitoring their biomasses for 24 months with subsequent conversion of these to carbon. The stock of carbon in the roots was estimated by the product of their biomass and the concentration of carbon. It was also estimated carbon and carbon dioxide equivalent captured in the air (trees and shrubs, leaf litter and herbaceous plants) and underground (root) and quantified the CO2 emitted by soil. The CO2eq stocks contained in the roots, litter and herbaceous plants were estimated from measurements of their biomasses. As for the determination of CO2 emissions were installed cylinders to capture the CO2 released from the soil. was found in the survey 3,791 individuals, distributed in 14 families, 21 genera and 22 species. The index of Shannon and Pielou evenness was 2.02 nats.ind-1 and 0.67, respectively. The species Croton blanchetianus presented the highest value of importance, density and frequency and Mimosa caesalpiniifolia had the highest dominance. The predominant diameter class of individuals was observed 3 to 6 cm and the height of class 3.1 to 7 m. The Fabaceae family holds the largest number of species and the Croton blanchetianus (Euphorbiaceae) was the one who had the highest dominance of the settlement is concluded that the evaluated area has characteristics of an early stage of ecological succession. The carbon in the woody compartments (19.27 t ha-1), litter (2.62 t ha-1), herbaceous plants (0.57 t ha-1) and roots (4.73 t ha-1), stored in the bush after 30 years in regeneration is around 27.19 t ha-1 C. It was found that the estimated annual fixation of CO2eq. magazines trees, undergrowth, herbaceous plants and roots present in up to 30 cm depth was 14,51 t ha-1 yr-1 CO2eq.. Together, the evaluated compartments exceed the soil CO2 emissions by 1,47 t ha-1 yr-1 CO2eq. The litter was the tank with the highest annual CO2 fixation carbon equivalent, followed by reservoirs trees, herbaceous plants and roots. It is concluded that the area assessed at the time it is presents itself as an effective carbon regulator reinforcing the… Advisors/Committee Members: Eunice Maia de Andrade, SebastiÃo Medeiros Filho, Francisca Soares de AraÃjo, Helba AraÃjo de Queiroz PalÃcio, AntÃnia Leila Rocha Neves.

Subjects/Keywords: AGRONOMIA; Sequestro de carbono; Ecologia; Fitossociologia; Carbon sequestration; Ecology; Phytosociology; AGRONOMIA; AGRONOMIA; AGRONOMIA; AGRONOMIA

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

JÃnior, L. R. P. (2016). Structure and carbon stock in caatinga vegetation: a case study in an area with 30 years of regeneration. (Doctoral Dissertation). Universidade Federal do Ceará. Retrieved from http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=16685 ;

Chicago Manual of Style (16th Edition):

JÃnior, LÃcio Resende Pereira. “Structure and carbon stock in caatinga vegetation: a case study in an area with 30 years of regeneration.” 2016. Doctoral Dissertation, Universidade Federal do Ceará. Accessed May 07, 2021. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=16685 ;.

MLA Handbook (7th Edition):

JÃnior, LÃcio Resende Pereira. “Structure and carbon stock in caatinga vegetation: a case study in an area with 30 years of regeneration.” 2016. Web. 07 May 2021.

Vancouver:

JÃnior LRP. Structure and carbon stock in caatinga vegetation: a case study in an area with 30 years of regeneration. [Internet] [Doctoral dissertation]. Universidade Federal do Ceará 2016. [cited 2021 May 07]. Available from: http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=16685 ;.

Council of Science Editors:

JÃnior LRP. Structure and carbon stock in caatinga vegetation: a case study in an area with 30 years of regeneration. [Doctoral Dissertation]. Universidade Federal do Ceará 2016. Available from: http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=16685 ;

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