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Accueil du site → Doctorat → Espagne → 2017 → Calidad de planta de Pinus halepensis Mill. en repoblaciones forestales en la provincia de Valencia. Definición y contraste de los estándares de calidad de planta

Universidad de Córdoba (2017)

Calidad de planta de Pinus halepensis Mill. en repoblaciones forestales en la provincia de Valencia. Definición y contraste de los estándares de calidad de planta

Hermoso de Mena, Javier

Titre : Calidad de planta de Pinus halepensis Mill. en repoblaciones forestales en la provincia de Valencia. Definición y contraste de los estándares de calidad de planta

Auteur : Hermoso de Mena, Javier

Université de soutenance : Universidad de Córdoba

Grade : Tesis Doctoral 2017

Résumé
The large forest fires that have affected the province of Valencia since the 1990s, which have been very intense and recurrent on the same forest land, coupled with adverse climatic conditions and prolonged periods of severe droughts during the last decades, have led to a decrease or even a suppression of the ecosystem’s regeneration ability in large forest areas, which makes it possible to maintain the activity of reforestation in the medium term. Aleppo pine (Pinus halepensis Mill.) has been one of the most used species in reforestation, since its resistance to drought and its pioneering character makes its establishment much easier than other tree species with which it shares habitat and niche of potential use. Thus, 64% of the reforestations carried out in the province of Valencia have used the Aleppo pine as the main species. In addition, the medium and long-term climatic forecasts in these Mediterranean areas suggest the introduction of species such as Aleppo pine, resistant to prolonged and intense dry periods. In the reforestations carried out in the Valencian Community there is a significant percentage of mortality that hardly drops below 30-35%. Although the climatic factors are the most important cause of plantation failure, there are also technical factors prone to be improved or controlled, such as the mismatch between optimum weather conditions and the moment of planting, proper ecological zoning within the project area, lack of founded criteria when applying some cultural treatments or stock quality specifications. The stock quality is a necessary prerequisite for the success of the reforestation, and its influence on the field response has been widely demonstrated, especially in difficult environments such as the Mediterranean. Also, the stock quality of a particular stocklot is a direct consequence of the cultural regime practiced in the nursery, so the importance of this culture regime on the success of the planting is also direct. The initial hypothesis of the thesis has been that plant quality is a key factor in the improvement of the establishment of reforestation of Pinus halepensis across the main types of forest sites in the province of Valencia. When high variability in different stocklots of this species was observed according to the nursery of origin, it was suggested that this heterogeneity of stock quality could be responsible for the low survival rates obtained in many reforestations carried out in the province of Valencia. The determination of a quality standard and the establishment of the cultural regime necessary to obtain it should contribute to an improvement on the survival of Aleppo pine in reforestation. The general objective of the thesis is to determine a quality standard of Pinus halepensis, for the particular Valencian conditions, and to establish the cultural regime necessary for its production, which implies the study of the different variables being used in nursery and its influence on the growth development of the species. To that end, several nurseries in the Valencia province growing Pinus halepensis were selected for monitoring and control of both the growing regime and the final stock quality of this species between the growing years of 2002 and 2008.

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