Quantification du processus d'agrégation dans les Technosols

Abstract : Technosols form a new class of soils, which is characterized by a strong anthropogenic influence of which functioning is less studied. Aggregates can be considered as an integrator of soil history and an indicator of soil bio functioning, therefore studying the process of aggregation is a relevant way to understand how technosols operate and states towards which they will evolve. Through samples collected on a hone hectare plot, a protocol of none destructive direct quantification of aggregates and porosity by thin sections images analysis has been performed. Results showed that this Technosol is compacting with a decrease of pores with an equivalent diameter >2000 µm and an increase of those <25µm. Despite this compaction, the aggregation increases with time. To study the dynamics of porosity and aggregation of this constructed Technosol as function of pedogenetic factors, a dispositive of in situ soil visualization has been developed. Results of images analysis showed that, during the early stage of soil evolution, porosity and aggregation increase significantly in all modalities. Then, they significantly decrease in ?wetting drying cycle? modality but continued increasing in ?plant? and ?plant-earthworm? modalities. This increase is proportional to the age of plants roots and intensity of earthworm?s activity. The ?constructed Technosol? is therefore an experimental soil model whose organomineral contents and function are well controlled compared to so-called ?natural soils?. In these evolved natural soils, the starting point is quite systematically unknown
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Salifou Nouhou Jangorzo. Quantification du processus d'agrégation dans les Technosols. Sciences agricoles. Université de Lorraine, 2013. Français. ⟨NNT : 2013LORR0004⟩. ⟨tel-01749377⟩

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