Skip to Main content Skip to Navigation
Conference papers

Biogéochimie de la matière organique des suspensions du Congo et de ses affluents : approche par les marqueurs moléculaires.

Abstract : Sterol, pigment and elemental carbon and nitrogen compositions are reported for surface suspended particulate materials collected dong 1200 Km reach of the Ubangui and Congo rivers from Bangui to Brazzaville during the high flood period of 1989. Rock-Eval pyrolysis and amino-acid datas of monthly sampling at Brazzaville are also related. Particulate organic matter associated to surface suspended particles transported in the mainstem is mainly originated from soils and characterized by a low content of algal carbon (< 2 % of POC) evaluated by measurements of chlorophyll g concentrations. The ratios of cuticular plant sterols ( stigmastérol/sitostérol) of surface particles indicate rather homogenous input of organic matter from soils in the Ubangui river, whereas this ratio point out complese and heterogenous input of detritical organic matter in the Congo river. Some tributaries: Lobaye, Motaba and Sangha, Likouala, Alima, have been characterized by extreme acidic waters and by particulate organic matter almost esclusively from allochtonous origin.
Document type :
Conference papers
Complete list of metadatas

Cited literature [17 references]  Display  Hide  Download

https://hal-insu.archives-ouvertes.fr/hal-00078093
Contributor : Nathalie Pothier <>
Submitted on : Friday, June 2, 2006 - 3:22:36 PM
Last modification on : Friday, April 5, 2019 - 8:08:23 PM
Long-term archiving on: : Monday, April 5, 2010 - 10:12:42 PM

Identifiers

  • HAL Id : hal-00078093, version 1

Collections

Citation

P. Scribe, C. Pepe, Patrick Albéric, Ch. Barreau, J. Fillaux, et al.. Biogéochimie de la matière organique des suspensions du Congo et de ses affluents : approche par les marqueurs moléculaires.. 1993, pp.83-95. ⟨hal-00078093⟩

Share

Metrics

Record views

160

Files downloads

420