Dégradation de la matière organique dans les ruisseaux vosgiens : effet indirect des amendements sur la qualité des litières

Abstract : Calcium-magnesium liming is a currently used method to enhance headwater stream ecosystems recovery from anthropogenic acidification. The effect of liming on ecological processes such as decomposition was the subject of many studies, but indirect effects on breakdown rate caused by a change in litter quality have never been studied. The original hypothesis was that liming would produce a richer litter that would decompose more rapidly. To answer this question, Beech (Fagus sylvatica) litter from five limed areas and from three acid controls have been submerged in the same river. Litter from two calcareous sites where added to extend the litter quality gradient. The use of litter of different quality aimed to determine factors in litter structure and composition that influence breakdown rate. Chemical analysis showed higher level of Ca and Mg concentrations in litter from limed sites and lower level of carbon. None of the other factors studied had significant differences between limed and control samples. Differences in litter breakdown rates were important. Litter from calcareous sites decomposed faster. Phosphorous and lignin content seem to be the most important factor to predict breakdown rate. However, decomposition of litter from limed sites was not faster, in fact the opposite trend was observed.
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Master thesis
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Joey Allen. Dégradation de la matière organique dans les ruisseaux vosgiens : effet indirect des amendements sur la qualité des litières. Sciences de l'environnement. 2013. ⟨hal-01862724⟩

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