test_moissonnage_selune
type: Agent

Importance et devenir des biopolymères (lignines et polysaccharides) dans les sols d'une chronoséquence de hêtraies (Fagus Sylvatica), en forêt de Fougères (France).
type: Dataset
contact point: Organization
  fn: CCSD
keyword: infoeu-reposemanticsarticle
keyword: sduenvisciences-of-the-universe-physicscontinental-interfaces-environment
keyword: degradation
keyword: neoformation-hetraie-de-plaine
keyword: carbone-organique
keyword: mull-and-moder
keyword: journal-articles
keyword: organic-carbon
keyword: beech
keyword: neoformation
keyword: mull-et-moder
landing page: 1286-4560
description: Importance and fate of biopolymers (lignins and polysaccharides) in soils of Fagus sylvatica stands of various ages in Fougères forest (Britany - France). Four beech stands of various ages were selected in 1997 to study the evolution of lignins and structural polysaccharides (cellulose, hemicelluloses) in the soil cover. The 10-year-old station has a mull type humus. In the 27-year-old stand there is a mull-moder mosaic whereas in the 87 and 145-year-old stands humus is a moder. Twenty-one soil profiles were sampled by separating the different humus layers, i.e., OL and OF, present in mull and moder, the OH layer, present only in the moder. Organo-mineral A11 and A12 horizons were also sampled with some A13 horizons in the mull stations. Lignins are abruptly degraded in mull where they represent 52°/°° of the total organic carbon (TOC) in OL and only 12°/°° in A1 horizons. Similarly, polysaccharides undergo degradation from 236°/°° (OL) to 105°/°° (A1) of TOC. The fast decrease in the concentration of these components over a small depth interval is indicative of a strong biological activity. The lignin alteration is evidenced by the decrease of the ratio of syringic compounds over vanillic compounds that reveals methoxyl group losses and the increase of vanillic acid over vanillic aldehyde which indicates oxidative depolymerization of lignins. In old stands (87, 145-y.) where humus was of an uniform moder type, the decrease of the xylose/mannose ratio in the OF and OH layers reveals the production of microbial sugars at the expense of the phyto-inherited polysaccharides, like cellulose and hemicelluloses which decrease, whereas lignins are also strongly degraded. The decrease of the structural polysaccharides continues in the underlying A1 horizon, similar to the evolution observed in the transition from mull to moder although at a less degradation rate. Des parcelles de la forêt de Fougères, constituant une chronoséquence de peuplements de hêtre de 10, 27, 87 et 14…
issued: 2026-05-25T06:56:01.438029
language: fr
modified: 2026-05-25T06:56:01.438035

Importance et devenir des biopolymères (lignines et polysaccharides) dans les sols d'une chronoséquence de hêtraies (Fagus Sylvatica), en forêt de Fougères (France).
type: Distribution
access URL: https://insu.hal.science/hal-00067780
format: HTML
issued: 2026-05-25T06:56:01.510073
modified: 2026-05-25T06:56:01.391610