Padrões espaço-temporais da produtividade vegetal na Caatinga
Ecosystem patterns of vegetation are well related to climatic factors in seasonal environments. Rainfall is a limiting resource in arid lands but there is evidence that in lack of precipitation, geographic aspects, such as terrain and water balance contribute to stabilizing primary productivity....
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| Formato: | Dissertação |
| Idioma: | pt_BR |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/30317 |
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| Resumo: | Ecosystem patterns of vegetation are well related to climatic factors in seasonal
environments. Rainfall is a limiting resource in arid lands but there is evidence that in
lack of precipitation, geographic aspects, such as terrain and water balance contribute to
stabilizing primary productivity. Using geoprocessed data of temporal series, we tested
the influence of altitude and water deficit for each vegetation type (forest, Grassland and
water deficit) on primary productivity and on the stability of this ecosystem function in
Caatinga domain. We expect a positive effect and a negative effect, respectively, on
primary productivity and stability. We believe arborous physiognomies depend more on
altitude increase while shrubby-herbaceous layers are more strongly by water deficit. We
also classified Caatinga in higher and lower productivity and stability, based on median
division. And, we modeled the temporal structure of these changes, seasonally, through a
cross-correlation function. Water deficit was the main predictor of productivity and
stability, affecting both negatively, while altitude had a positive effect, but not in forest
vegetation. Forest, still, is the vegetation in which stability is most affected by water
deficit, indicating that this ecosystem may be more prone to climate change. Primary
productivity variation in Caatinga through months fluctuates seasonally, and the greater
portion takes part in a synchronized cycle, suggesting vegetation dynamics is predictable
even with rainfall irregularities. Understand how these patterns vary in the landscape and
what is the role of environmental fluctuations is important to conduct conservation efforts
and understand what vegetation types may be more vulnerable to climate change. |
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