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Restoring the ecological quality of riparian ecosystems - a multi-level approach
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Autores
Orientador(es)
Resumo(s)
Many European rivers and floodplains have been subjected to long periods of anthropogenic degradation. Activities like land drainage, construction of dams and weirs, channelization, water abstraction and pollution, resulted, among others, in the loss of floodplains and wetlands, high sediment runoff, biodiversity losses, lowering of the river and water table levels and increase in peak flows. Thus, this thesis focuses on a multi-level top to bottom approach to freshwater ecosystem restoration, addressing the legislation restoration drivers, as well as the restoration at the basin and river section levels. The main conclusions are: a) to improve freshwater restoration success in Europe it is highly recommended to create more ecosystem restoration soft law and reinforcement mechanisms related with governance, quality, stakeholders, publicity and research; b) there is a joint effect of climate change and land use on river water quality, meaning that proposed environmental conservation measures may be too conservative to have a significant effect in river nitrogen concentration, particularly in a climate change context; c) local population awareness and participation are as essential for habitat restoration success as grazing herbivores exclusion, river pollutant load, water table levels and tree installation techniques; d) the sampling of a river section to assess the influence of the liquid effluent from an acid bisulfite pulp mill on river water quality did not reveal particularly high levels of pollution directly related to the mill, in spite of relevant levels of total phosphorous and dissolved lignin; and e) cork and Tasmanian blue gum bark are capable of enhancing biological denitrification in laboratory batch tests. The implementation of ecologically effective restoration should be flexible to adjust to changing climate and societal priorities, retaining simultaneously the capacity to integrate information from new technologies into site assessment and restoration planning
Descrição
Doutoramento em Engenharia Florestal e dos Recursos Naturais - Instituto Superior de Agronomia / UL
Palavras-chave
freshwater restauration riparian ecosystems Mediterranean nitrates denitrification
Contexto Educativo
Citação
Fabião, A.M.D. - Restoring the ecological quality of riparian ecosystems - a multi-level approach. Lisboa: ISA, 2019, 317 p.