Boletim Técnico Cientifico do CEPNOR TROPICAL JOURNAL of Fisheries and Aquatic Sciences www.periodicos.ufra.edu.br/index.php/bttc Introdução O geoprocessamento e o sensoriamento remoto auxiliam no planejamento e no monitoramento de possíveis impactos ambientais, esses instrumentos permitem a elaboração de mapas que vão subsidiar a gestão dos recursos mapeados, degradados ou não, e o planejamento para revitalização e utilização racional dos recursos naturais (ALVES; AZEVEDO, 2013). As atividades de geoprocessamento são executadas por meio de um sistema de informação geográfica (SIG), dotado de ferramentas para manipulação, transformação, armazenamento, visualização, análise e modelagem de dados georreferenciados, sendo assim, um instrumento para gestão e preservação ambiental que permite analisar, planejar e monitorar ações de forma mais coerente e eficaz com um considerável ganho de tempo (CÂMARA; DAVIS;

<p>Recently burnt areas have frequently been documented to produce strong to extreme catchment-scale hydrological and erosion responses to major rainfall events, even if these responses have rarely been quantified. These responses have raised important concerns, both among forest owners and managers on the on-site implications of soil (fertility) loss and among water resources managers for the off-side impacts on downstream values-at-risk such as road and hydraulic infrastructures, flood zones, and surface water quality in reservoirs or at river intake points. State-of-the-art emergency stabilization management, as practiced in the USA and Galicia, aims at reducing the hydrological and erosion response at its main source, i.e. the hillslopes. Based on years and decades of experience and pain-staking field monitoring in both the USA and Galicia, mulching is typically preferred over barrier-based methods, especially for being more effective in the case of high-intensity rainfall storms. Even so, the LIFE-REFOREST consortium (LIFE17 ENV/ES/000248) has developed an innovative barrier-based technique that is designed to be implemented easier and faster than log and shrub barriers and, at the same time, to improve vegetation recovery, using seeds of plant species that establish vegetation strips against runoff and erosion and/or seeds of tree and shrub species for re- or afforestation. The REFOREST barriers consists of geotubes containing, besides seeds, a mycotechnosoil as well as straw. The effectiveness of the LIFE-REFOREST geotubes is current being tested under field conditions in summer-2019 burnt areas in north-central Portugal and Galicia, in contrasting forest types (eucalypt vs. pine) on contrasting parent materials (schist vs. granite). Both field trials involve, besides 3 control plots and 3 plots with geotubes, also 3 plots mulched with either eucalypt logging residues or pine needles. The present poster will show preliminary results of the field trial in north-central Portugal, in a second-rotation eucalypt stand where tree crowns were scorched by the fire and soil burn severity was classified as moderate. These results concern the initial monitoring period till early spring 2020. However, this monitoring period has been quite rainy so far, arguably providing rather ideal conditions for testing the effectiveness of barrier-based solutions such as that of LIFE-REFOREST.</p>

Boletim Técnico Cientifico do CEPNOR TROPICAL JOURNAL of Fisheries and Aquatic Sciences www.periodicos.ufra.edu.br/index.php/bttc Introdução As variáveis de qualidade da água na carcinicultura estão constantemente sendo modificadas devido às práticas de manejo no cultivo, influenciando diretamente na sanidade, sobrevivência e crescimento do organismo cultivado. Os programas de monitoramento devem analisar, em seu banco de dados, não apenas parâmetros físicos, químicos, sanitário da água e dos sedimentos, como também levar em consideração as variáveis hidrológicas dos ecossistemas nos quais estão inseridos. Assim, é possível avaliar a influência do cultivo sobre o ambiente e deste sobre o cultivo, de modo a indicar a necessidade de revisão nas técnicas de manejo do processo produtivo (BOYD; HARGREAVES; CLAY,

<p>Wildfires are well-known to negative affect forest both directly and indirectly, due to fire-enhanced runoff generation and the associated losses of wildfire ash, soil, organic matter and nutrients. In turn, post-fire runoff and erosion can, promote eutrophication and contamination of downstream surface water bodies. A variety of erosion mitigation measures have been tested in recently burnt areas, with especially mulching with straw having been applied in operational post-fire land management in the USA and Galicia. The present work, evaluates the effectiveness of a new erosion mitigation strategy, using geotubes filled with mycotechnosols and straw, and compares it to that of mulching. This was done for the two prevalent forest types in central Portugal and Galicia, i.e. an eucalypt plantation in Central Portugal and a pine plantation in Galicia that both burnt during the summer of 2019.  Both study sites were instrumented with 9 bounded erosion plots of 16m<sup>2</sup> with sediment traps at the bottom of the plots, divided over three blocks. The three treatments of doing nothing, mulching and geotubes were applied to one plot per block. In total, 4 geotubes were placed in each plot to create a barrier in the middle of the plot and at the bottom, just before the sediment deposition zone at the plot outlet. Mulching was done with chopped eucalypt bark at the eucalypt site and with pine needles at the pine site, at application rates of roughly 250 g m<sup>-2</sup>. Eroded sediments were collected on a bi-weekly to monthly basis, depending on occurrence of rain, during the first post-fire hydrological year. The results showed that the erosion rates of the control plots differed about one order of magnitude between the two sites, amounting to  an average of 11 Mg  ha<sup>-1 </sup>y-<sup>1</sup> at the pine site as opposed to 1.0 Mg ha<sup>-1</sup> y-<sup>1</sup>  at the eucalypt site. This discrepancy was probably related to soil type (derived from granite vs. schist) and stoniness. Mulching was somewhat more effective than the geotubes at the pines site, with reduction in average annual erosion rates of 84 and 77%, respectively. The opposite was true at the eucalypt site, with annual erosion reductions of on average 75 and 62%. The use of geotubes would therefore seem a further option for forest and water resources managers to decrease markedly the risks of both elevated and reduced soil (fertility) losses from recently burnt hillslopes and the associated risks for downstream values.</p>

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