Skip to Main content Skip to Navigation
Journal articles

Microbiotic soil crusts in the Sahel of Western Niger and their influence on Soil POROSITY and water dynamics

Abstract : Microbiotic soil crusts are common features of the surface of fallow land in Western Niger. We investigated the interaction between these microbial covers and the porosity and water dynamics of soils at the surface of a Sahelian landscape. The soil pore system was examined by microscopic observations and mercury porosimetry. The soil water retention capacity was measured using a Richard pressure membrane apparatus. Runoff measurements were performed in situ at a one m2 scale under natural rainfall. Samples with dense cyanobacterial cover had microbially-originated pores ranging from 0.04 and 50 μm in size. These samples also showed higher total soil porosity and retained two to four times more water than samples with thin microbial cover. These properties are closely related to the hydrophobic nature of cyanobacterial components. Final runoff values obtained on densely covered surfaces were significantly higher compared to those measured on surfaces with thin microbial cover due to the geometry of the microbially-originated pore system and its functioning.
Complete list of metadatas

Cited literature [39 references]  Display  Hide  Download

https://hal-insu.archives-ouvertes.fr/insu-00338694
Contributor : Nathalie Pothier <>
Submitted on : Friday, November 14, 2008 - 9:04:08 AM
Last modification on : Friday, June 19, 2020 - 6:27:56 PM
Long-term archiving on: : Monday, June 7, 2010 - 7:55:56 PM

File

MalamIssaetalrevisedfinal.pdf
Files produced by the author(s)

Identifiers

Collections

Citation

Oumarou Malam Issa, Christian Défarge, Jean Trichet, C. Valentin, J.L. Rajot. Microbiotic soil crusts in the Sahel of Western Niger and their influence on Soil POROSITY and water dynamics. CATENA, Elsevier, 2009, 77 (1), pp.48-55. ⟨10.1016/j.catena.2008.12.013⟩. ⟨insu-00338694⟩

Share

Metrics

Record views

617

Files downloads

772