MORTALITY AND INGROWTH PATTERN OF DIPTEROCARPS IN FOREST RECOVERY IN EAST KALIMANTAN

Abstrak

In primary and logged-over natural foresttrees conditions tree structure, mortality and ingrowth rates , the such as will vary according to the species characteristic. Quantitative management variables become very important to support yield regulation tools for achieving sustainable forest management. The objective was to determine studymortality and ingrowth rates to formulate biometric characteristic variability Dipterocarps forest in logged-over of forests based on time series The was Labanan, East Kalimantan Province. Permanent data.study sitelocated in measurement within -overwere located to represent three, i.e plots logged forest different logging techniques. 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 48 ha and was measured periodically every 2 years within 17 years after .aboutlogging. For data analysis purpose, trees were divided into Dipterocarps and non-Dipterocarps. two major groups, i.e. Range of mortality rates for all species in logged-over forest were 2.5-29.3% per ha per 2 years which was close very to primary forest at year-5 after logging. While range of ingrowth rate for all species in logged-over forest were 1.3-21.3% per ha per 2 years which were higher than those for the primary forest within 17 years. The mortality and ingrowth rates fluctuation of Dipterocarps species group were different from those of non-Dipterocarps.