Les cernes des arbres permettent-ils de retracer les variations passées de la fertilité du sol ?

Abstract : The long-term response of forest ecosystems to element input (atmospheric depositions, fertilization) is still not well-known. The study of tree-ring elemental composition (Dendrochemistry) may help to retrospectively monitor the past variations of ecosystem fertility, then providing useful information for anticipating the effects of future changes. Our objective was to test if tree-ring elemental composition analysis can point out changes of ecosystem fertility. We used an experimental design in Bercé (72) where sessile oaks (Quercus petraea) were subjected to three fertilization treatments. Inter-annual variation in tree-rings N, Mg, P, K, Ca and Mn composition from 1950 to 2007 were analysed by wavelength-dispersive spectrometry. Large elemental composition variations were observed within tree-rings. Moreover, inter-annual variations in elemental composition appeared to be mainly affected by internal physiological processes (such as passive diffusion and active translocation toward the sapwood) rather than by changes in the environment (e.g. water availability). Therefore, precise dating of the fertilization event was impossible. Nonetheless, higher mean composition in P, Ca and Mn was still observed in fertilized individuals almost 40 years after the fertilization occurrence.
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Master thesis
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Maxime Durand. Les cernes des arbres permettent-ils de retracer les variations passées de la fertilité du sol ?. Sciences de l'environnement. 2015. ⟨hal-01770029⟩



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