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Dynamics of mineral elements under a fast-growing eucalyptus plantation in Brazil. Implications for soil sustainability.

Abstract : Each year the area of fast-growing tree plantations in the world expands by around one million hectares. Concerns are rising regarding their influence on soil fertility and water resources. This thesis, as part of a project developed at the University of São Paulo, aims at studying the soil matrix and solution during the first two years of growth of an Eucalyptus Grandis stand to identify the drivers of the chemistry of the soil solution, quantify the water and nutrient fluxes leaving the ecosystem by deep drainage, and prepare reactive transport modeling using the MIN3P model. It is shown that (i) Eucalyptus trees took up large amounts of water starting from six months after planting, so that the water drainage at a depth of 3 m was largely reduced, (ii) almost no nutrient was leached below a depth of 3 m, (iii) part of the fertilizers was taken up by the Eucalyptus trees without appearing in soil solution, (iv) following clear cutting and fertilizing, large amounts of nutrients were released in the upper soil layers and leached down to a depth of 1 m (65-100 kg ha-1 of N-NO3) : acidification occurred in the upper soil layers but in such ferralsols, Al reserve and buffering capacity are still large, (v) S released by the fertilizers increased Ca, Mg and P mobilities, and decreased the H and Al release in soil solution, (vi) large quantities of S released by the fertilizers were adsorbed on the soil constituents, if this sulphate happens to be desorbed, greater soil acidification is to be expected. It is suggested that the amount of N brought by the fertilizers can be reduced without altering the stand productivity.
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Submitted on : Thursday, July 21, 2011 - 3:58:16 PM
Last modification on : Friday, October 8, 2021 - 4:26:19 PM
Long-term archiving on: : Friday, November 4, 2011 - 3:08:30 PM


  • HAL Id : pastel-00610330, version 1



Valérie Maquere. Dynamics of mineral elements under a fast-growing eucalyptus plantation in Brazil. Implications for soil sustainability.. Silviculture, forestry. AgroParisTech, 2008. English. ⟨NNT : 2008AGPT0086⟩. ⟨pastel-00610330⟩



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