Soil CO2 effluxes, soil carbon balance, and early tree growth following savannah afforestation in Congo: Comparison of two site preparation treatments

Autor: André Mabiala, Claire Marsden, Yann Nouvellon, Laurent Saint-André, Olivier Hamel, Antoine Kinana, Jean-Pierre Bouillet, Olivier Roupsard, Philippe Deleporte, Jean-Paul Laclau, Daniel Epron, Rémi d’Annunzio
Přispěvatelé: Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Ecologie et Ecophysiologie Forestières [devient SILVA en 2018] (EEF), Institut National de la Recherche Agronomique (INRA)-Université de Lorraine (UL), Unité de recherche Biogéochimie des Ecosystèmes Forestiers (BEF), Institut National de la Recherche Agronomique (INRA), Escola Superior de Agricultura Luiz de Queiroz
Jazyk: angličtina
Rok vydání: 2008
Předmět:
010504 meteorology & atmospheric sciences
SOIL DISTURBANCE
EUCALYPTUS PLANTATIONS
01 natural sciences
NORTHERN AUSTRALIA
Soil respiration
[SDV.SA.SF]Life Sciences [q-bio]/Agricultural sciences/Silviculture
forestry
Afforestation
SOIL CARBON BALANCE
FLUX ET STOCKS C
Water content
2. Zero hunger
Eucalyptus
Expérimentation
Forestry
04 agricultural and veterinary sciences
PREPARATION TILLAGE
SPATIAL-DISTRIBUTION
EASTERN AUSTRALIA
Herbicide
SOIL CO2 EFFLUX
Carbone
CLONAL STAND
HETEROTROPHIC SOIL RESPIRATION
Plantations
Soil science
Recensement
Management
Monitoring
Policy and Law
CHEMICAL-COMPOSITION
complex mixtures
FOREST MANAGEMENT
Désherbage mécanique
ORGANIC-CARBON
Teneur en eau du sol
Croissance
CHANGEMENT D'USAGE DES TERRES
0105 earth and related environmental sciences
Nature and Landscape Conservation
Sol
Sowing
SAVANNAH AFFORESTATION
Soil carbon
15. Life on land
SOIL WATER CONTENT
F61 - Physiologie végétale - Nutrition
Agronomy
Soil water
040103 agronomy & agriculture
0401 agriculture
forestry
and fisheries
Environmental science
Soil fertility
Cycle du carbone
Dioxyde de carbone
Zdroj: Forest Ecology and Management
Forest Ecology and Management, Elsevier, 2008, 255 (5-6), pp.1926-1936. ⟨10.1016/j.foreco.2007.12.026⟩
ISSN: 0378-1127
DOI: 10.1016/j.foreco.2007.12.026⟩
Popis: International audience; Eucalyptus plantations have been introduced since 1978 on savannah soils of the coastal plains of Congo, but there is still little information on the effect of silvicultural practices on soil organic carbon dynamics after afforestation on these savannahs. The objectives of this study were to assess the effects of two experimental site preparation treatments on soil CO2 efflux, tree growth and soil carbon balance during the first year following plantation establishment. One treatment involved mechanical soil disturbance with disk harrowing (D), whereas in the second treatment (H), savannah grasses were killed by herbicide application before planting, without mechanical soil disturbance. Soil respiration and soil water content were monitored for 1 year following treatment application, at 2-week intervals. We hypothesized that mechanical soil disturbance would increase soil CO2 efflux, but the results did not support this hypothesis. The cumulated soil CO2 efflux over 1 year was not significantly different in the two treatments and averaged 658 g C m-2. In contrast, tree growth was significantly increased by disk harrowing, maybe as a result of decreased soil penetration resistance. Carbon inputs to the soil from savannah residues (428 g C m-2) were outweighed by the annual carbon outputs through heterotrophic respiration (505 and 456 g C m-2 in the H and D treatments, respectively) leading to a slightly negative soil carbon budget in both treatments 1 year after afforestation.
Databáze: OpenAIRE
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