Browsing by Author "Firmino, Paulo Neves"
Now showing 1 - 3 of 3
Results Per Page
Sort Options
- Análise do módulo da queda de folhada em eucaliptais no modelo 3-PGPublication . Firmino, Paulo Neves; Carvalho, Ana Paula Soares; Tomé, MargaridaAn underestimation of accumulated leaf biomass obtained with the 3-PG model when applied to a fertilization and irrigation trial of Eucalyptus globulus, conduced to install three plots in seminal high forest of Eucalyptus globulus with different ages and different site indexes to support the tendency observed in the fertilization and irrigation trial. Plots 1 and 2 were installed in a 4,5 years old eucalyptus stand, while plot 3 was installed in a 8,5 years old stand. Acummulated litterfall (dried) biomass during the period 15 March – 26 October 2011, was 1,12 Mg ha-1, 1,86 Mg ha-1 e 2,82 Mg ha-1 respectively. A higher site index distinguished results of the same age stands, while the plot at the older stand achieved superior biomass. Although the reduced number of litterfall collects, estimates obtained by 3-PG when applied to the three plots confirm the underestimation of litterfall. It’s necessary to complete this study for at least one year and possibly install more plots in different combinations of age and site index to confirm the need of improvement of the litterfall module of 3-PG model in Portugal.
- Intra-annual tree diameter increment and seasonal leaves nutrients in cork oak species under three understory management alternativesPublication . Faias, Sónia; Firmino, Paulo Neves; Tomé, Margarida; Moreno, Gerardo; Paulo, Joana AmaralAn experimental trial implemented on a pure unevenaged cork oak stand, in Podzol soil, with the specific goal of comparing understory management alternatives, was monitored between 2003 and 2015. The stand understory layer is composed by spontaneous vegetation dominated by Cistus salvifolius, Lavandulla peduncalata and Ulex airensis. Cork samples from two distinct cork rotation cycles (2003 to 2012 or 2006 to 2015), taken at the beginning and end of the debarking period, were analyzed regarding cork ring width (Faias et al. 2018, Faias et al. 2019). Results suggest a different effect on cork annual growth depending on whether the operations are performed at the middle or at the beginning of the cork rotation cycle. Under the CorkNeighbors research project, this trial was continuously monitored and analyzed between 2016 and 2019 (Faias 2019).
- Using quantile regression to evaluate the impact of different factors in the cork caliper of cork oak trees in montado agroforestry ecosystemPublication . Paulo, Joana Amaral; Firmino, Paulo Neves; Faias, Sónia; Tomé, Margarida