10 documents found, page 1 of 1
Influence of water and nutrients on cork oak radial growth – looking for an eff...
Constança, Camilo-Alves; José Antonio, Nunes ; Ana Patricia, Poeiras; João, Ribeiro ; Dinis, Cati; M. Barroso , João; Vaz, MargaridaAbstract The widespread cork oak (Quercus suber L.) mortality and reduced afforestation /regeneration are causing an overall reduction in cork production. To enhance trees’ growth and vitality, afforestation techniques using fertirrigation were tested. The main objective was the promotion of trees’ growth on new dense plantations using minimum water requirements until reaching productive forests. The experiment...
MANUAL TÉCNICO DE PRÁTICAS SILVÍCOLAS PARA A GESTÃO SUSTENTÁVEL EM POVOAMENTOS ...
Ribeiro, João Rui; de Almeida Ribeiro, Nuno; Vaz, Margarida; Dinis, Cati; Camilo-Alves, Constança; Poeiras, Ana Patrícia; Beltrán, Ramón SantiagoPrefácio: Em Portugal Continental, segundo os dados do 6º Inventário Florestal Nacional (IFN6)(ICNFa), os espaços florestais (floresta, matos e improdutivos) ocupam 6,2 milhões de hectares (69,4%) do território, ocupando a floresta uma área de 3,2 milhões de hectares. Os “montados”, os sobreirais e os azinhais constituem a principal ocupação florestal, com 1.069.300 hectares, representando cerca de 1/3 da flore...
Irrigation of Young Cork Oaks under Field Conditions—Testing the Best Water Volume
Camilo-Alves, Constança; Dinis, Cati; Vaz, Margarida; Mota Barroso, João; Almeida Ribeiro, NunoThis study is the beginning of the first long-term study on cork oak irrigation under field conditions, with a structural-functional approach. Cork oaks are currently facing disturbances affecting cork quality and quantity, jeopardizing the future of the economic sector. There is a need for new production techniques that maximize cork oak growth and vitality. In this study, irrigation was implemented in a new i...
Modeling Diachronic Cork Oak Dieback–Comparison of Two Case Studies
Camilo-Alves, Constanca; Saraiva-Dias, Susana; Dinis, Cati; Felix, Maria do Rosário; Varandas, Carla; Almeida Ribeiro, NunoWidespread events of cork oak mortality are disturbing the system and jeopardizing cork production. This research combined techniques to analyze in detail these events on a small scale. To understand the dynamics of cork oak mortality and the factors associated with it, a diachronic study was performed in two farms located in Évora, Portugal. The case studies were two nearby farms suffering from tree dieback si...
Inventário Nacional de Mortalidade de Azinheira na Fotografia Aérea Digital de ...
Almeida Ribeiro, Nuno; Surový, Peter; Dinis, Cati; Camilo Alves, Constança; Saraiva Dias, SusanaO presente estudo completa o 1.º inventário de árvores mortas e de grau de coberto na fotografia aérea digital de 2004-2006 para o sobreiro (Ribeiro e Surový, 2008) e azinheira para a área abrangida pela NUTS III: Alentejo Central; Alto Alentejo, Baixo Alentejo, Alentejo Litoral, Algarve, Médio Tejo, Lezíria do Tejo, Beira Baixa e Área Metropolitana de Lisboa. Os resultados deste estudo sincrónico são de partic...
CORK OAK (Quercus suber L.) ROOT SYSTEM: A STRUCTURAL-FUNCTIONAL 3D APPROACH
Dinis, CatiDesde as últimas décadas que se tem vindo a testemunhar o declínio e a morte súbita do sobreiro (Quercus suber L.) no Montado. A complexidade da gestão deste sistema de produção engloba um grande conjunto de soluções que, por terem sido ausentes de validação científica (tal como a relacionada com o sistema radical do sobreiro), tem vindo a ser suportado, principalmente, pela aplicação do conhecimento empírico. ...
Cork Oak Seedling Growth under Different Soil Conditions from Fertilisation, My...
Dinis, Cati; Surovy, Peter; Ribeiro, Nuno A; Machado, Rui; Oliveira, Maria RGRegeneration process deals with some constrains related with the livestock management, pasture rotations, and dependence of a sequence of favourable climatic years, among others, which can lead to a continuous delay in the initiation of the regeneration process. The purpose of this study is to promote an increase of cork oak seedling growth in order to decrease the time required for regeneration and also to con...
Comparison of two methods to assess the root architecture as the potential fact...
Dinis, Cati; Surovy, Peter; Ribeiro, Nuno AIn this article we describe two methods for acquisition and examination of the root architecture of trees in order to evaluate the possible influence on stand diversity and horizontal structure. The roots and belowground biomass in semi-arid areas of south Portugal can be understood as the main competition area for the trees so understanding of their growth and architecture is essential for understanding of gro...
The effect of soil compaction at different depths on cork oak seedling growth
Dinis, Cati; Surový, Peter; Ribeiro, Nuno; Oliveira, Maria R.G.Soil compaction promoted either by inadequate management (pressure of livestock and machinery) or by soil natural conditions (podzolisation) can influence the growth of cork oak seedlings. We hypothesized that compaction could be related with the lack of natural regeneration and decline on cork oak stands. In this paper, we evaluated the response of cork oak seedlings growth in terms of area and biomass product...
Importance of automatic threshold for image segmentation for accurate measureme...
Surový, Peter; Dinis, Cati; Marušák, Róbert; Ribeiro, NunoThe fine roots are considered the key organs for plant survival, growth and productivity. Measurement of fine roots variables is easily and conveniently achieved by means of digital image. The descriptive variables like root area, surface, total length and diameter distribution may be obtained from the image. Analysis of digital image consists from several steps, each of them represents potential source of the ...