A qualidade do detrito media os efeitos da umidade na decomposição
Litter from different species can influence directly the decomposition through chemical and physical traits, and indirectly promoting changes in the microenvironment. However, we do not know how the indirect litter effects can interact with the environmental context (i.e. different rates of humidity...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/44756 |
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| Resumo: | Litter from different species can influence directly the decomposition through chemical and physical traits, and indirectly promoting changes in the microenvironment. However, we do not know how the indirect litter effects can interact with the environmental context (i.e. different rates of humidity) and affect the magnitude of the decomposition. In this work, we assess the interactive effects of the water holding capacity (WHC) and precipitation on the magnitude of the decomposition. Through an experimental approach, using microcosms, we evaluated the leaf litter decomposition rates of five plant species: Anacardium occidentale L., Chamaecrista ensiformis (Vell.) Irwin & Barneby, Hymenaea courbaril L., Myrcia ramuliflora (O. Berg) and Vitex rufensis A. Juss, with distinct WHC. We evaluated it on five sites distinct in moisture levels, based on the precipitation regime for the sampling site of the litter, relative to the microcosm area and the experiment duration. The moisture treatments were: Control (0.75ml); Minimum (2.4ml); Medium (6.4ml); Maximum (30ml) and Above maximum (47.5ml). After 240 days of the experiment, we quantified the decomposition rate using the remaining mass. We found individual and interactive effects of WHC and precipitation rate in the litter decomposition. The increase in precipitation accelerated the decomposition of the species. It was stronger for the species with higher WHC (Vitex rufensis). Our results indicate the importance of the litter identity, with the indirect effects that can affect the decomposition by attenuating the environmental conditions. |
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