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Dynamics of a lowland dipterocarp forest in East Kalimantan two years after logging

Sist P.. 2001. In : Cox M.C. (ed.), Elouard Claire (ed.). Proceedings of 6th Round Table Conference on Dipterocarps. Perth : Curtin University of Technology, p. 62-75. Round Table Conference on Dipterocarps. 6, 1999-02-08/1999-02-12, Bangalore (Inde).

The effects of conventional and reduced impact logging (RIL) practices on tree growth, mortality, and recruitment were assessed in a lowland dipterocarp forest of East Kalimantan, Indonesia. All trees >or= 10 cm dbh were measured in 12 - four hectare permanent plots, before and after logging, during the period 1986-1994. Volume extracted during selection logging ranged from 51 to 247.8 m3/ha in areas using conventional harvesting practices, compared to 23.5-217.8 m3/ha where RIL techniques were applied. On average, conventional logging damaged 48% of the pre-harvest stems, versus 25% using RIL measures with a felling intensity < 8 trees /ha. Where RIL practices exceeded a felling intensity of 8 trees/ha, the effectiveness of RIL in limiting forest damage was significantly reduced. Two years after logging, areas with the highest level of damage had the highest annual tree mortality (3%), whereas sites exhibiting basal area removals of < 20% had annual mortality rates similar to undisturbed primary forest (1.6%). Mean annual diameter increment in undisturbed forest was 2.2 mm/year with dipterocarp growing faster than the other species (3 mm/year). Two years after logging, there was a significant increase of growth of both all the remaining tree population (3.9 mm/year) and dipterocarps (5.1 mm/year). Based on these findings and growth rates increments as well, a second harvest volume of 56 M3 /ha can be expected 60 years following logging in primary forest, where RIL measures remove less than 8 trees/ha during the initial harvest event. Limiting the intensity of the harvest to < 8 trees/ha, and applying RIL techniques leads to faster stand recovery and greater second rotation harvest volumes compared to conventional logging practices. However, neither system yields acceptable harvest volumes on 35 year rotations, as recommended by the Indonesian forest management regulations

Mots-clés : dipterocarpaceae; forêt primaire; composition botanique; caractéristique du peuplement; abattage d'arbres; impact sur l'environnement; Évaluation; méthode; dynamique des populations; contrôle de croissance; rendement; protection de la forêt; sylviculture; régénération naturelle; asie du sud-est; kalimantan

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