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Effet des essences forestières sur la biodégradation des matières organiques : impact sur la dynamique et le cycle du carbone, de l'azote et des éléments minéraux

Abstract : The aim of this study was to determine the relevant indicators of the dynamic of organic matter (OM) and some steps of the cycle of carbon, nitrogen and mineral nutrients in relation with the nature of tree species. The experimental site of Breuil-Chenue (Morvan), which allows on similar conditions, to follow the tree species effect, was used as work support. Field and laboratory experimental approaches show that 30 years after the plantation, the expression of the native forest (a coppice with standards dominated by beech, 150 year-old) disappeared, under the effect of young tree species. Marked differences were observed in litter decomposition, carbon and nitrogen mineralization, and dynamics of major elements, even in soil aggregate fractions. Groups of tree species stands were distinguished: the first one having a good potential of decomposition, concerns Douglas fir and beech, whose OM in the A1 horizon, was not abundant but relatively recalcitrant. Nitrate production was higher and implicated on Ca, Mn and Mg mobility. The second group was characterized by a low potential of decomposition. It includes native forest, and spruce plantation whose needles richest in lignin, Fe and Al accumulate on topsoil. Soil OM from these both stands presented a weak nitrate production, but release much more soluble organic compounds with a great potential of carbon mineralization in lab. Fe and Al were more mobilized. The oak plantation, with leaf litter low in lignin and richer in Ca, Mg, Mn and K, occupied an intermediate position. Plant materials were decomposed rapidly. However, strong production of litter and its high proportion of wood result in it accumulation on topsoil.
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http://docnum.univ-lorraine.fr/prive/SCD_T_2006_0133_MOUKOUMI.pdf
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Submitted on : Thursday, March 29, 2018 - 10:40:47 AM
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Judicaël Moukoumi. Effet des essences forestières sur la biodégradation des matières organiques : impact sur la dynamique et le cycle du carbone, de l'azote et des éléments minéraux. Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2006. Français. ⟨NNT : 2006NAN10133⟩. ⟨tel-01746587⟩

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