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Evaluation de l’impact des brûlages dirigé sur les pinèdes à Pinus laricio

Abstract : The effects of prescribed burning in heterogeneous field conditions on Pinus nigra subsp. laricio are still quite unknown. In this perspective, a multidisciplinary approach combining physical fire measurements, physiological and ecological measurements was implemented. Two experiments of prescribed burning were carried out in different locations. First, in a forest of mature P. nigra subsp. laricio in true conditions; then, in nursery, as a preliminary study to test indicators and obtain information on young individuals.For each experiment, the intensity of prescribed burning was characterized by temperature measurements in and out of the trunk. Physiological monitoring was carried out with the use of several complementary approaches: gas exchange, chlorophyll fluorescence, sap flux and loss of conductance. A survey was also performed on the plot scale (litter mass, botanical) during three years.Since P. nigra subsp. laricio is not studied much, we first tried to evaluate seasonal variations of physiological indicators. Pines showed a significant response to weather, with a decrease in gas exchange with the atmosphere, this behaviour is typical of a drought avoidance strategy. These results have been used as a basis to explain ecophysiological responses of pines to environmental disturbances.Following the prescribed burning, significant differences were observed between the experiment in the nursery and the experiment in the forest. Indicators of vitality used showed no significant effects on mature pines. Young individuals were much more sensitive, suffering severe damages to the trunk and crown, causing the death of some pines.The specific richness and composition of undergrowth vegetation were strongly influenced by short-term prescribed burning and did not return to baseline after three years.The information acquire allowed us to extend knowledge about the physiology and tolerance to hydric and thermal stresses for P. nigra subsp. laricio as well as to provide recommendations to forest managers.
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Submitted on : Friday, November 12, 2021 - 6:07:11 PM
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Gauthier Lapa. Evaluation de l’impact des brûlages dirigé sur les pinèdes à Pinus laricio. Sciences agricoles. Université Pascal Paoli, 2017. Français. ⟨NNT : 2017CORT0017⟩. ⟨tel-03426986⟩

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