Growth and productivity modeling of seven Eucalyptus species in Souiniet's arboretum in the northwestern of Tunisia

Mhamdi Sameh, Elaieb Mohamed Tahar, Souayah Naoufel, Khouja Mariem, Khouja Mariem, Aloui Ali, Candelier Kévin. 2021. Growth and productivity modeling of seven Eucalyptus species in Souiniet's arboretum in the northwestern of Tunisia. Forestist, 1 (1) : 1-16.

Résumé : This study consists of the development of tree growth models to deduce stands productivity and determine the highest productive species in the conditions of the concerned plantation. Seven Eucalyptus, introduced in the arboretum of Souiniet (north-west of Tunisia, wet Mediterranean bioclimate) in a Cork Oak natural forest, were studied. Stem analysis and non-linear growth modeling regression equations were used to predict wood productivities. Gompertz and Chapman–Richards growth function appeared as being great numerical models to estimate the Eucalyptus tree diameter and height evolutions, respectively. Moreover, an adapted Chapman–Richards model allowed predicting the volume of trees in an efficient manner. The values of mean annual volume productivity of the Eucalyptus spp.studied, allow us to classify them in order of increasing annual productivity, as follows: E. sideroxylon, E. cinerea, E. maidenii, E. macrorhyncha, E. tereticornis, E. viminalis and E. bicostata. The first three Eucalyptus spp. appeared as the best-adapted and most suitable Eucalyptus trees for new plantations in this area. These species had the highest mean annual increments, ranged from 5 to 10 m3.ha−1.year−1 with 15 to 20 years of rotation. E. bicostata is the most promising, with annual average production exceeding 10 m3.ha−1.year−1 after 25 years, and reaching 20 m3.ha−1.year−1 at 40 years old. These modeling approaches provide additional knowledge on the productivity of the different Eucalyptus species, thus enabling forestry operators to simulate the development of forest stands in order to optimize timber production and harvesting.

Mots-clés Agrovoc : modélisation, accroissement du diamètre, productivité, arboretum, peuplement forestier, production forestière, Eucalyptus maidenii, Eucalyptus macrorhyncha, Eucalyptus viminalis, climat méditerranéen, Eucalyptus tereticornis

Mots-clés géographiques Agrovoc : Tunisie

Mots-clés complémentaires : Eucalyptus bicostata, Eucalyptus sideroxylon, Eucalyptus cinerea, Eucalyptus bicostata

Mots-clés libres : Annual mean increment, Eucalyptus, Modeling, Productivity, Stem analysis, Wet mediterranean bioclimate

Classification Agris : K10 - Production forestière
F62 - Physiologie végétale - Croissance et développement
U10 - Informatique, mathématiques et statistiques

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Auteurs et affiliations

• Mhamdi Sameh, Université de Carthage (TUN)
• Elaieb Mohamed Tahar, Université de Carthage (TUN)
• Souayah Naoufel, Taibah University (SAU)
• Khouja Mariem, Université de Carthage (TUN)
• Khouja Mariem, Université de Carthage (TUN)
• Aloui Ali, ISPT (TUN)
• Candelier Kévin, CIRAD-PERSYST-UPR BioWooEB (FRA) ORCID: 0000-0002-9328-8511 - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/599005/)

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