Dépôts atmosphériques particulaires sur les écosystèmes forestiers de la moitié Nord de la France : influence sur les cycles biogéochimiques

Abstract : Quantifying the little-known inputs of atmospheric particulate deposition (APD) is critically important for a sustainable management of forest ecosystems. Indeed, harvesting and subsequent nutrient losses are going to increase so as to meet the demand in renewable energy, including fuel-wood. This work aims at filling this gap by (i) describing the deposition rate, mineralogical and chemical compositions of APD and (ii) evaluating the influence of APD nutrient inputs on forest biogeochemical cycles. To do so, 4 beech stands in North French forests were equipped for a 4-week sampling. After a metrological development, samplers out of and below canopy were used for a 2-year sampling, as well as methods to separate APD from atmospheric dissolved deposition. These methods were conceived to separate the organic and mineral fractions of APD according to the conceptual model designed in this work. My results validated this model and indicated (i) a quite constant deposition rate of 19±3 kg.ha-1.year-1 of hardly soluble minerals over the North of France, made of various minerals suggesting heterogeneous sources of particles, (ii) nutrient inputs inferior to those of atmospheric dissolved deposition and soil weathering, but improving ecosystem fertility, (iii) an interception effect of the canopy, and (iv) the dissolution of mineral particles in the atmosphere which enriched atmospheric dissolved deposition in nutrients. Extending and optimizing the sampling would allow confirming and clarifying these results, especially concerning high atmospheric load periods and APD below canopy
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Emeline Lequy. Dépôts atmosphériques particulaires sur les écosystèmes forestiers de la moitié Nord de la France : influence sur les cycles biogéochimiques. Biologie végétale. Université de Lorraine, 2012. Français. ⟨NNT : 2012LORR0277⟩. ⟨tel-01749463⟩

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