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Impact du vieillissement et de la fertilité minérale sur l'allocation du carbone entre croissance, respiration, stockage et reproduction chez le chêne et le hêtre : Approche expérimentale et modélisation

Abstract : In order to increase our understanding of carbon allocation in broadleaved species, our research consisted of studying the effects of ageing and soil mineral fertility on the carbon allocation between growth, storage and reproduction for oaks and beech. Ageing was studied over a forest succession using a chronosequences approach. Two liming experiments were investigated in order to study the variation of carbon allocation with soil mineral fertility in contrasting situations. The productivity decline in beech was followed by substantial changes in carbon allocation, with a continuous decrease of carbon allocation to growth, to the benefit of reproduction and storage functions. Conversely, carbon allocation in oak remained stable during its entire development. The dendrochronological analysis of inter-annual variations of radial growth shown also that beech and oaks presented contrasted climate-response of growth. There was clear evidence of a long-term increase with time in radial growth in both species. We also observed a long-term increase of inter-annual variations of growth with time for beech but not for oaks. The declining beech presented a sharp decreasing allocation to growth to the benefit of the carbon storage compounds. Moreover, liming induced an temporary increase of radial growth. However, the increase of carbohydrates in limed beeches was still significant 15 after treatment compare to the controls. These results suggested that the stock of carbohydrates is a key parameter of the physiological integrity for adult beeches. These results concerning the intrinsic (ageing) and external (liming, climate) factors of carbon allocation in oaks and beech enabled to confirm two contrasted models of carbon functioning.
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Hélène Genet. Impact du vieillissement et de la fertilité minérale sur l'allocation du carbone entre croissance, respiration, stockage et reproduction chez le chêne et le hêtre : Approche expérimentale et modélisation. Silviculture, forestry. Université Henri Poincaré - Nancy 1, 2009. English. ⟨NNT : 2009NAN10121⟩. ⟨tel-01748501⟩

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