A navegação consulta e descarregamento dos títulos inseridos nas Bibliotecas Digitais UC Digitalis, UC Pombalina e UC Impactum, pressupõem a aceitação plena e sem reservas dos Termos e Condições de Uso destas Bibliotecas Digitais, disponíveis em https://digitalis.uc.pt/pt-pt/termos. Conforme exposto nos referidos Termos e Condições de Uso, o descarregamento de títulos de acesso restrito requer uma licença válida de autorização devendo o utilizador aceder ao(s) documento(s) a partir de um

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... o de IP da instituição detentora da supramencionada licença. Ao utilizador é apenas permitido o descarregamento para uso pessoal, pelo que o emprego do(s) título(s) descarregado(s) para outro fim, designadamente comercial, carece de autorização do respetivo autor ou editor da obra. Na medida em que todas as obras da UC Digitalis se encontram protegidas pelo Código do Direito de Autor e Direitos Conexos e demais legislação aplicável, toda a cópia, parcial ou total, deste documento, nos casos em que é legalmente admitida, deverá conter ou fazer-se acompanhar por este aviso. Past and present fire regimes in temperate forest zone of lowland Central Europe Autor(es): Zin, Ewa; Niklasson, Mats; Szczygie, Ryszard Publicado por: Imprensa da Universidade de Coimbra URL persistente: URI:http://hdl.handle.net/10316.2/34199 Abstract Fires in Central European lowland forests are nowadays numerous but efficiently suppressed and hence usually very small. Poland is one of the countries with highest annual number of forest fires in the region, with as many as 9-10 000 individual fire events per year (with record of 17 000 fires in 2003), however of relatively limited size, with 0.5-0.95 ha being mean values of area burned in a single forest fire. Main fire season in Poland lasts from March to September and is driven largely by weather conditions and litter humidity, with people being the dominant source of ignition. Active forest fire prevention and suppression is carried both by the regular fire services and State Forest Administration -the main forest manager in Poland due to the ownership structure of forest land in the country (>80% state-owned). In Białowieża Forest, one of the best preserved lowland forest ecosystems in temperate Europe fires happen at present rather incidental, alike in the rest of the country are effectively controlled and thereby affect very small areas (0.5 ha). However numerous stands with fire scarred trees, stumps and snags, especially in the conifer dominated areas, can be found; indicating substantial fire presence in the past. The first tree ring fire history records from that area evidenced frequent fires in Pinus sylvestris-dominated forests during the 17th up to early 19th centuries, with dramatic decrease in fire presence over the last 150+ years, most likely linked to changes in human fire use and forest management. We conclude that there is a large need for fire history and fire ecology studies in Central Europe due to high population density and strong dominance of flammable conifers in forests of that region. Extended knowledge about past disturbance dynamics and reference conditions may be essential for future sustainable forest management and nature conservation throughout this part of European continent.