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Previous issue date: 2016-08-31 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / O objetivo dessa tese ? compreender o papel da radia??o solar e da precipita??o, bem
como o efeito da redu??o desta, sobre a decomposi??o da serrapilheira em um ecossistema no
semi?rido brasileiro. O estudo foi desenvolvido, entre os anos de 2013 e 2015, em um fragmento
da Caatinga situado no munic?pio de Jo?o C?mara, Rio Grande do Norte, Brasil, atrav?s de um
conjunto de tr?s experimentos manipulativos em campo. Evidenciou-se que, no ecossistema
estudado, a fotodegrada??o e seus efeitos indiretos afetaram o processo de decomposi??o,
proporcionando, isoladamente, 24% da perda de massa e desempenhando papel similar ?quele
da precipita??o (26%). Observou-se um papel aditivo da radia??o solar e da precipita??o no
controle das taxas de decomposi??o anual da serrapilheira. As redu??es nos n?veis de
precipita??o mostraram-se respons?veis por gerar impactos negativos nas taxas de
decomposi??o da serrapilheira de at? 41,2%, nos cen?rios testados. Resta comprovado que, na
?rea de estudo, o processo de decomposi??o da serrapilheira n?o est? estruturado apenas por
um processo biol?gico, mas, tamb?m, pelo processo abi?tico da fotodegrada??o. Por fim, os
resultados desta tese alertam para poss?vel colapso no processo de decomposi??o da
serrapilheira decorrente de eventuais redu??es de chuvas, e que esse efeito pode comprometer
o funcionamento desse ecossistema. / The aim of this thesis is to understand the role of solar radiation and precipitation, as
well as the effect of reducing this, on the decomposition of litter in an ecosystem in the Brazilian
semiarid region. The study was conducted between the years 2013 and 2015 in a fragment of
the Caatinga in the municipality of Jo?o C?mara, Rio Grande do Norte, Brazil, through a set of
three manipulative field experiments. It had demonstrated that the photodegradation and its
indirect effects affected the decomposition process, providing alone, 24% of the weight loss
and plays a similar role to that of precipitation (26%). We observed an additive role of solar
radiation and the precipitation in the control of annual litter decomposition rates. Reductions in
the levels of rainfall proved to be responsible for generating negative impacts on litter
decomposition rates of up to 41.2% in the tested scenarios. It remains proven that, in the study
area, the process of decomposition of leaf litter is not structured only by a biological process,
but also by abiotic photodegradation. Finally, the results of this thesis warn of possible collapse
of the litter decomposition process due to possible reductions in rainfall which may undermine
the functioning of this ecosystem.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/22232 |
| Date | 31 August 2016 |
| Creators | Costa, Uirand? Oliveira |
| Contributors | 08699632797, http://lattes.cnpq.br/4312158184208542, Silva, Adriano Caliman Ferreira da, 01654556750, http://lattes.cnpq.br/4147444251852878, Souto, Jacob Silva, 35700106434, http://lattes.cnpq.br/9362236927970793, Attayde, Jos? Luiz de, 03130326707, http://lattes.cnpq.br/4121209629385349, Ara?jo, Virginia Farias Pereira de, 05399498413, http://lattes.cnpq.br/9257604383278293, Vasconcellos, Alexandre, Amado, Andr? Megali |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM ECOLOGIA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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