Caredda, Marcello (2009) Studio di relazioni fra l'accrescimento del sughero e il sughero e il pedoclima. Doctoral Thesis.
Cork-oak is an important tree of the forests in west Mediterranean areas. The objectives of the research have been achieved through a 10 year study of cork-ring sequence to define an eventual relation with soil quality and rainfall data. The diameter growth of Cork oaks was studied during 10- year cork-production cycle in relation to fluctuations in precipitation and soil quality. Cork specimens were obtained from 120 cork peel samplings carried out in June 2006 from Su Tuzzu - Janna e sa Chidda and from Su Montricu Mannu in Orune (Nuoro, Italy). The Cork-oak forest soil quality was studied by determining physical and chemical parameters with the aim to define an eventual relation with the diameter growth of Cork oaks. The ground balance was studied using the Newhall model for the determination of soil moisture regimes. The model in the BASIC software processes the monthly data of one year and computes a calendar in which the moisture condition of each day is recorded. For the calculations of lengths of periods of soil conditions that extend across calendar years, the model attaches an identical second year to the input. The two-year calendars are then scanned and the number of consecutive or cumulative days during which given soil climatic conditions prevail are calculated. The most important factor positively influencing diameter growth was cumulative precipitation in the growing season (January- June) and moisture condition in June.
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