Effetti della struttura del popolamento sui modelli di stima del volume e della biomassa epigea (Pineta di Castelfusano - Roma)
2009
Abstract: The main purpose of this research was to analyse the effects of stand structure on
biomassallocation and on the accurancy of estimation models for volume and aboveground
biomassof Italian stone pine (Pinus pinea L.). Although the species is widely distributed on Mediterranean coasts, few studies on forest
biomassestimation have focused on pinewoods. The research was carried out in the Castelfusano’s pinewood (Rome) and concerned the two most common structural types: (a) 50 years-old pinewood originated by
broadcast seeding; and (b) 62 years-old pinewood originated by partial seeding alternating worked strips to firm strips. Some 83 sample trees were selected for stem volume estimation and a subset of 32 trees used to quantify the total
epigeous
biomass, the wooden
biomasscompartment, including stem and big branches (diameter > 3 cm) and the photosynthetic
biomass, including thin branches (diameter < 3 cm) and needles. Collected data were used to elaborate allometric relations for stem volume, total
biomassand specific relations for both compartments, based on one (d2) or two (d2h) indipendent variables, for both structural types. Furthermore, pinewood specific
biomassexpansion factors (BEF) - indexes used to estimate carbon stocks starting from stem
biomassdata - were obtained. The achieved estimation models were subjected to both parallelism and coincidence tests, showing significant effects of stand structure on the accurancy of the allometric relations. The effects of stand structure and reliability of tree height curves on the accurancy of estimation models for volume and aboveground
biomassand on
biomassallocation in different compartments are analysed and discussed.
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