Contrasted effects of annual and perennial grasses on soil chemical and biological characteristics of a grazed Sudanian savanna - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Accéder directement au contenu
Article Dans Une Revue Applied Soil Ecology Année : 2017

Contrasted effects of annual and perennial grasses on soil chemical and biological characteristics of a grazed Sudanian savanna

Résumé

Growth and composition of plant communities depends on physico-chemical and biological characteristics of soils. Conversely, plants influence nutrient cycling and soil characteristics. Thus, they affect the long-term availability of nutrients, which feedbacks on their own growth and the primary productivity of ecosystems. This study focuses on the fertility and functioning of soils of a grazed savanna in Burkina Faso. It describes the effects of annual and perennial grasses involved in fallow succession, on chemical and biological (microbial biomass, mineralization and enzymatic activities) characteristics of soils. To do this, soil samples were collected under the four dominant species of grasses (A. ascinodis, A. gayanus, A. pseudapricus and L. togoensis) and under bare areas within 48 plots, as well as above- and belowground grass biomass. Results show that root biomass, pHKCl, basal respiration and fluorescein diacetate activities were significantly higher under perennial grasses (A. gayanus and A. ascinodis) than annual (A. pseudapricus and L. togoensis) and bare soil. Nitrate levels were higher under A. gayanus that had the lowest root biomass. Total carbon, total nitrogen, microbial biomass and acid phosphatase were higher under the perennial grass A. ascinodis. pHwater was lower under A. pseudapricus. Finally, ammonium and β-glucosidase activities weren’t significantly different between species. Overall, these results appear complex certainly due to factors of variability that remain to be identified. Nevertheless, they support the general hypothesis that perennial grasses have a greater influence on soil than annuals. Soil biological parameters (Basal respiration, microbial biomass, Beta-glucosidase, fluorescein-diacetate and acid phosphorus) exhibited strong relationship with soil pH, total C and N.
Fichier non déposé

Dates et versions

hal-01600253 , version 1 (02-10-2017)

Licence

Copyright (Tous droits réservés)

Identifiants

Citer

Lambiénou Yé, Jean Christophe Lata, Dominique Masse, Hassan Bismarck Nacro, Roger Kissou, et al.. Contrasted effects of annual and perennial grasses on soil chemical and biological characteristics of a grazed Sudanian savanna. Applied Soil Ecology, 2017, 113, pp.155-165. ⟨10.1016/j.apsoil.2017.02.003⟩. ⟨hal-01600253⟩
115 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More