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Etude du système racinaire de l'Eucalyptus en plantation tropicale : analyse architecturale, croissance et respiration

Abstract : The aim of this study was to study the development of the root system of the 1-41 clone of Eucalyptus in Congo. Root architecture was studied in an age serie stands. A root typology was proposed with five classes of roots and three main functions: soil exploration with both lateral and vertical roots, soil exploitation with a network of fine roots and re exploitation of the soil zone by late emitted roots. All of these root types appeared at all the studied stages because of reiterations that allow the root system to explore a large soil volume. The results of root respiration study were used to parameterize a root respiration model with root respiration partitioned between a growth component, a maintenance component and a nutrient absorption component. The model was then applied using field data of fine root biomass and nitrogen content of whole tree biomass to estimate fine root respiration of a Eucalyptus stand. The simulated value fits reasonably well with independent estimates of root respiration in this site. Estimations of fine root production and turnover were highly variable depending of the methods used. The more realistic one predicts a turnover of 4 year-1, i.e. a high recycling of carbon and nutrient by belowground litter. Results of this study offer promising perspective for developing an architectural model of root development and its use to establish carbon, water and nutrient budget in Congolese Eucalypt plantation.
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https://hal.univ-lorraine.fr/tel-01748463
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Armel Thongo M'Bou. Etude du système racinaire de l'Eucalyptus en plantation tropicale : analyse architecturale, croissance et respiration. Biologie végétale. Université Henri Poincaré - Nancy 1, 2008. Français. ⟨NNT : 2008NAN10039⟩. ⟨tel-01748463⟩

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