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Ecosystem services in logged-over and natural forests: a case study from West Kalimantan, Indonesia

Labriere N., Locatelli B., Laumonier Y.. 2015. In : Kettle Chris J. (ed.), Magrach Ainhoa (ed.). Resilience of tropical ecosystems: future challenges and opportunities. Frankfurt am Main : Society for Tropical Ecology, p. 47. Annual Conference of the Society for Tropical Ecology, 2015-04-07/2015-04-10, Zurich (Suisse).

As the extent of Southeast Asian tropical rainforests affected by logging keeps increasing, the impact of logging on ecosystem services' delivery needs to be clarified. We focused on 3 ecosystem services relevant to mankind at different scales: climate regulation through carbon storage, tree diversity and soil conservation against erosion. We surveyed 1 ha of logged-over (selectively logged ca. 7-15 yr prior to survey) and natural forest close to a village where livelihoods depend on swidden agriculture and smallholder rubber tapping. Data to assess carbon stocks in above-ground biomass and topsoil (0-20 cm) and tree diversity were collected. A network of silt fences was also set up and eroded material collected, dried and weighted on a monthly basis. Mean carbon stocks in above-ground biomass were significantly higher in natural compared to logged-over forests. Though mean carbon stocks in topsoil were almost twice as important in natural forest than logged-over one, the difference was not significant due to high spatial heterogeneity in topsoil carbon content. Erosion rate was low for both forest types (up to 2-order of magnitude lower than tolerable soil erosion rate). That said, we did not include landslides along the logging road that are numerous and expected to lead to an increase of the total sediment yield of logging activities. Species richness was similar for the two forest types, but community composition analysis revealed strong difference, with the noticeable reduction in importance value for the Dipterocarp family. Overall, ecosystem services' provision was lower in logged-over forests than in natural ones (for the services we focused on, that were mostly regulating services), and we stress than sufficient time between consecutive rotations is compulsory so as to enable maximum recovery of carbon stocks (both in above-ground biomass and topsoil) and re-establishment of late-successional tree species. (Texte intégral)

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