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Microbial enzymatic activities and community-level physiological profiles (CLPP) in subsoil layers are altered by harvest residue management practices in a tropical Eucalyptus grandis plantation

Maillard F., Leduc V., Bach C., Gonçalves J.L.M., Dini Andreote F., Saint-André L., Laclau J.P., Buée M., Robin A.. 2019. Pesquisa Florestal Brasileira, 39 : p. 659-660. IUFRO World Congress 2019 "Forest Research and Cooperation for Sustainable Development". 25, 2019-09-29/2019-10-05, Curitiba (Brésil).

Harvest residue management is a key issue for the sustainability of Eucalyptus plantations established on poor soils. Soil microbial communities contribute to soil fertility by the decomposition of the organic matter (OM), but little is known about the effect of whole-tree harvesting (WTH) in comparison to stem only harvesting (SOH) on soil microbial functional diversity in Eucalyptus plantations. We studied the effects of harvest residue management (branches. leaves. bark) of Eucalvptus grandis trees on soil enzymatic activities and community-level physiological profiles in a Brazilian plantation. We measured soil microbial enzymatic activities involved in OM decomposition and we compared the community level physiological profiles (CLPP ) of the soil microbes in WTH and SOH plots. WTH decreased enzyme activities and catabolic potential of the soil microbial community. Furthermore, these negative effects on soil functional diversity were mainly observed below the 0-5 cm layer (5- 10 and 10-20 cm), suggesting that WTH can be harmful to the soil health in these plantations.

Mots-clés : eucalyptus grandis; plantation forestière; fertilité du sol; micro-organisme du sol; résidu de récolte; activité enzymatique; brésil

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