Skip to Main content Skip to Navigation
Theses

Quels indicateurs pour évaluer la qualité de sols forestiers soumis à des contraintes environnementales fortes ?

Abstract : Mountain soils are facing strong changes in land-use and climate, which expose them to three main threats: erosion, loss of biodiversity and organic matter decline. This thesis focuses on mountain soil quality, through key ecosystem processes (decomposition and aggregation of soil organic matter) occurring in topsoils. These key processes control the provision of several soil ecosystem services such as carbon sequestration, nutrient supply, and biological activity. We have tested both simple and composite soil quality indices under environmental constraints in two study sites. Both sites are characterized by a strong vegetation gradient generated by natural constraints (sporadic permafrost in Dévoluy mountains, Isère, France), or human constraints (wildfire chronosequence in the Maures mountains, Var, France). Our results demonstrate that both soil microclimate and wildfire constraints affect soil attributes linked to decomposition and aggregation processes in topsoils. Soil biota (microflora and microfauna) is markedly affected, indicating modifications in soil processes controlled by soil foodweb (main decomposition and aggregation pathways, potential nitrification and denitrification). Near infrared reflectance spectroscopy (NIRS) is found to be a powerful tool for assessing the modifications of physico-chemical and biological quality of soils under environmental constraints.
Document type :
Theses
Complete list of metadata

Cited literature [143 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-00396553
Contributor : Lauric Cécillon <>
Submitted on : Thursday, June 18, 2009 - 2:25:26 PM
Last modification on : Sunday, January 3, 2021 - 8:20:03 PM
Long-term archiving on: : Tuesday, June 15, 2010 - 5:38:15 PM

Identifiers

  • HAL Id : tel-00396553, version 1

Collections

Citation

Lauric Cécillon. Quels indicateurs pour évaluer la qualité de sols forestiers soumis à des contraintes environnementales fortes ?. Sciences de la Terre. Université Joseph-Fourier - Grenoble I, 2008. Français. ⟨tel-00396553⟩

Share

Metrics

Record views

531

Files downloads

13987