Estimation of the harvestable potential after logging in a lowland mixed dipterocarp forest of East Kalimantan
2001
Vincent Favrichon | Nicolas Nguyen-The | Anna Enggelina
A model is used to assess in a simple way the number of dipterocarp stemsabove the cutting limit of 60 cm dbh through time after logging and silviculturaltreatment. Different scenarios of simulation are set up depending on whetherreduced impact logging techniques (RIL) and/or silvicultural treatment is applied.The data used are those of the STREK project implemented in East Kalimantan,Indonesia, complete with data from the literature. A scenario of reference is builtwith the assumptions of the TPTI (Indonesian selective cutting and planting system).In the strict observance of the TPTI, with RIL methods and regular subsequentthinnings, the time required to recover the initial number of dipterocarp stemsabove 60 cm dbh is around 50 y. With more realistic scenarios, this time is aroundlOOy or more. The use of RIL methods with silvicultural treatment leads to areduction of 15 y compared with the recovery time of the conventional logging.After 35 y, the official TPTI cutting cycle, the simulation foresees a potential harvestof about 5 stems ha'wit h RIL methods and one thinning compared with 8 treeslogged at the first harvest. The method does not take into account the volumeand does not distinguish the injured or misshapened trees but provides a basic,adaptable tool to be used by field managers.
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