A tree distance-dependent growth and yield model for naturally regenerated pure uneven-aged maritime pine stands in central inland of Portugal |
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Authors: | Cristina Alegria Margarida Tomé |
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Affiliation: | 1. Unidade Departamental de Recursos Naturais e Desenvolvimento Sustentável, Instituto Politécnico de Castelo Branco—Escola Superior Agrária, Quinta da Senhora de Mércules, 6001-909, Castelo Branco, Portugal 2. Centro de Estudos Florestais, Instituto Superior de Agronomia, Tapada da Ajuda, Universidade Técnica de Lisboa, 1349-017, Lisbon, Portugal
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Abstract: | ? Context Maritime pine (Pinus pinaster Aiton) is one of the most important Portuguese species, growing in pure stands ranging from even-aged to multi-aged structures. Current growth and yield models were developed only for even-aged, managed stands and/or for very specific regions of Portugal. ? Aims This paper focuses on the validation of the existing size-class model PBRAVO, adapted to even-aged stands, and on the subsequent development of a single tree distance-dependent growth and yield model (PBIRROL), both in distance-independent and distance-dependent versions, for uneven-aged stands. ? Methods The new model is composed of four modules, each with a set of sub-models for: tree variable prediction, tree volume prediction, future tree list prediction and growth projection. ? Results The evaluation of the PBRAVO and PBIRROL models showed that the new model gives more accurate predictions. Moreover, medium-term simulations provided consistent and logical predictions. ? Conclusion It was verified that individual tree models are more suited to simulate poorly managed uneven-aged stands than diameter distribution models. No clear superiority of distance-dependent models was found over models using just distance-independent measures of inter-tree competition. |
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