Mortality and ingrowth pattern of dipterocarps in forest recovery in east kalimantan

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Abstract

In primary and logged-over natural forest, the trees conditions such as tree structure,mortality and ingrowth rates will vary according to the species characteristic. Quantitative management variables become very important to support yield regulation tools for achieving sustainable forest management. The study objective was to determine mortality and ingrowth rates to formulate biometric characteristic variability of dipterocarps forest in logged-over forests based on time series data. The study site was located in Labanan, East Kalimantan Province. Permanent measurement plots within logged-over forest were located to represent three different logging techniques, i.e. a) reduced impact logging with diameter limit 50 cm(RIL 50); b) RIL 60; c) conventional logging; and d) primary forest as control. Total plot permanent area was about 48 ha and was measured periodically every 2 years within 17 years after logging. For data analysis purpose, trees were divided into two major groups, i.e. Dipterocarps and non- Dipterocarps. Range of mortality rates for all species in logged-over forest were 2.5-29.3%per ha per 2 years which was very close to primary forest at year-5 after logging. While range of ingrowth rate for all species in logged forest were 1.3-21.3%per ha per 2 years which were higher than those for the primary forest within 17 years. Themortality and ingrowth rates fluctuation of Dipterocarps species groupwere different fromthose of non-Dipterocarps.

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Susanty, F. H., Suhendang, E., Jaya, I. N. S., & Kusmana, C. (2015). Mortality and ingrowth pattern of dipterocarps in forest recovery in east kalimantan. Biotropia, 22(1), 11–23. https://doi.org/10.11598/btb.2015.22.1.297

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