DSpace Community:
http://hdl.handle.net/10174/23
2024-03-28T22:05:08ZNew plant communities to define the southern boundary of the European Atlantic Province in mainland Portugal
http://hdl.handle.net/10174/36179
Title: New plant communities to define the southern boundary of the European Atlantic Province in mainland Portugal
Authors: Raposo, Mauro; del Río, Sara; Vázquez-Pardo, Francisco; Costa, José Carlos; Cano-Ortiz, Ana; Pinto-Gomes, Carlos
Abstract: This study identifies and analyzes the plant communities that allow the definition of the geographic limits between Temperate and Mediterranean macrobioclimates, for the center of Portuguese mainland. The altitude of Serra da Estrela, Açor and Lousã, combined with the increase in atmospheric humidity, allows the presence of vegetation typical of a Temperate macrobioclimate. Thus, based on the phytosociological methodology, floristic relevés were carried out in order to identify the series of vegetation existing in these territories. Through these relevés carried out, four new plant associations were identified: Cytisetum grandifloro-striati ass. nova, Scrophulario grandiflorae-Sambucetum nigrae ass. nova, Pruno lusitanicae-Coryletum avellanae ass. nova that lives in the submediterranean bioclimatic variant, mesotemperate humid to hyper-humid. A new association namely Genisto falcatae-Quercetum broteroanae ass. nova with two subassociations were also identified. Based on the vegetation distribution, new biogeographic limits are proposed. Thus, it was intended to identify the southern limits of the European Atlantic Province (Atlantic Orolusitania Subrovince) based on the vegetation cover, namely the distinction between the Estrela Sierran District and a new Biogeographical District, the Alvo-Gardunhense.2023-11-01T00:00:00ZIs Soilless Culture a Sustainable Form of Agriculture?
http://hdl.handle.net/10174/36112
Title: Is Soilless Culture a Sustainable Form of Agriculture?
Authors: Gruda, Nazim; Machado, Rui; Erik A, Van OS
Abstract: A soilless culture system (SCS) is a technique used for plant production that has recently become increasingly popular [1,2]. For instance, almost all greenhouse areas in the Netherlands use SCSs due to their benefits, including up to 50% savings on water and fertilisers, the ability to steer crop growth vegetatively or generatively, and higher yields with better quality [3,4,5]. Similar systems with low investments can be used in mid- and low-tech horticulture. SCSs also enable growers to start with a disease-free crop; crop rotation is no longer required [5]. Further, it significantly benefits regions facing water scarcity, unfavourable soil conditions, infertility, soil-borne diseases, salinity, or sodicity [1,2,6]. Especially when water shortage is an issue, circulating surplus nutrient solutions can save water and expensive fertilisers. Alternatively, the surplus can be used in another crop without recirculating [4]. The primary goal is intensification. Thus, an SCS is employed in areas with suitable climate conditions and proximity to major urban centres to ensure and increase productivity.2023-10-31T00:00:00ZEvolution of land cover in the special area of conservation of Monchique (Southern Portugal): Have the objectives of the Natura 2000 network been achieved (1995–2018)?
http://hdl.handle.net/10174/35612
Title: Evolution of land cover in the special area of conservation of Monchique (Southern Portugal): Have the objectives of the Natura 2000 network been achieved (1995–2018)?
Authors: Raposo, Mauro; Nunes, Leonel; Pinto-Gomes, Carlos José
Abstract: The Natura 2000 Network, as the European Union's ecological network, aims to
ensure the long-term conservation of Europe's most threatened species and habitats,
helping to stop the loss of biodiversity. Based on this assumption, the changes in land
cover in the Special Area of Conservation (SAC) of Monchique between 1995 and
2018 are analysed and related to identify favourable and unfavourable policies concerning
the habitats and respective species conservation. The most important land
covers are compared with the habitats and species legally protected at the National
and European level, as well as the Red List of Vascular Flora of Mainland Portugal. As
main results can be highlighted the increase in the forest area occupied by species such
as Eucalyptus globulus and Pinus pinaster, and a reduction in the areas of grazing and
shrub species. Can also be noted an increase in the areas covered by invasive species,
which may be associated with the abandonment of rural areas. We identified 21 taxa
with high heritage interest in the Monchique SAC, occurring mainly in forest habitats,
namely 91E0, 92A0, 9240, 9330 and 9340, which should be considered in the elaboration
of future Territorial Management Plans. Thus, it can be concluded that the objectives
initially stipulated by the Natura 2000 Network were not fully achieved within
the Monchique SAC. Alternative management methods must be studied to allow conservation
in a territory with a high land consolidation and low population density.2023-07-31T23:00:00ZRotação e mistura de herbicidas para prevenir a resistência das infestantes, na cultura do trigo
http://hdl.handle.net/10174/35088
Title: Rotação e mistura de herbicidas para prevenir a resistência das infestantes, na cultura do trigo
Authors: Barros, José
Editors: Gomes, Paulo
Abstract: Nos últimos anos, a estratégia no controlo de infestantes na cultura do trigo, tem-se baseado principalmente na aplicação de herbicidas de pós-emergência, principalmente as designadas sulfonilureias (mesossulfurão, iodossulfurão, amidossulfurão e outras), estratégia esta que tem conduzido ao surgimento de muitas infestantes resistentes a estas substâncias ativas, em todo o Mundo. Assim, quer a rotação de herbicidas, quer a mistura de herbicidas são largamente recomendadas para prevenir a resistência das infestantes a estes produtos fitofarmacêuticos.
Nos anos agrícolas de 2016/2017 e 2017/2018, realizaram-se dois ensaios de campo na Herdade do Passinho (Elvas) e na Herdade da Almocreva (Beja) respetivamente, com o objetivo de estudar o efeito de diferentes misturas de herbicidas pertencentes a diferentes grupos ou modos de ação, no controlo de infestantes monocotiledóneas (folha-estreita) e dicotiledóneas (folha-larga) e, na produtividade da cultura do trigo.2023-03-01T00:00:00Z