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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
The manipulation of organic residues affects tree growth and heterotrophic CO
2
efflux in a tropical Eucalyptus plantation
Forest Ecology and Management, Volume 301, Year 2013
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Description
Fast-growing plantations are increasingly being established on tropical soils, where fertility is largely supported by soil organic matter (SOM) and where different management options of harvest organic residues is thought to impact the long-term sustainability of these plantations. The objectives of this study were: (1) to quantify the effect of contrasting methods of organic residue management on tree growth and soil CO2 effluxes in the first 2years after planting and (2) to evaluate the impact of organic residue manipulations on the mineralization of soil organic matter over the length of the experiment. Three treatments were setup in 0.125ha plots and replicated in three blocks at the harvesting of a Congolese Eucalyptus stand, resulting in an aboveground organic residue mass ranging from 0 to 6.3kgm-2. The mineralization of SOM was deduced in each treatment by partitioning sources of soil CO2 effluxes using decomposition experiments and by upscaling specific root respiration. Soil CO2 effluxes were greatly affected by seasons and organic residue manipulation, although there were no significant changes in topsoil water content and topsoil temperature over most of the study period. Aboveground organic residue was the first contributor to soil CO2 efflux in the two treatments with a litter layer. Organic residue management did not significantly influence the mineralization of SOM in our study, probably due to the low quality of Eucalyptus litter, or to the hypothetical lack of dissolved organic carbon transfers from litter to soil. A strong relationship was found between cumulative heterotrophic CO2 efflux and tree growth, supporting the hypothesis that the early growth of Eucalyptus trees in a sandy tropical soil is largely dependent on the nutrients released by the decomposition of organic residues. © 2012 Elsevier B.V.
Authors & Co-Authors
Versini, Antoine
Unknown Affiliation
Nouvellon, Yann
Unknown Affiliation
Laclau, Jean Paul
Unknown Affiliation
Kinana, A.
Unknown Affiliation
Mareschal, Louis
Unknown Affiliation
Zeller, Bernd
Unknown Affiliation
Ranger, Jacques
Unknown Affiliation
Epron, Daniel
Unknown Affiliation
Statistics
Citations: 44
Authors: 8
Affiliations: 6
Identifiers
Doi:
10.1016/j.foreco.2012.07.045
ISSN:
03781127
Research Areas
Environmental
Sexual And Reproductive Health
Study Approach
Quantitative