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All Journal BIOTROPIA - The Southeast Asian Journal of Tropical Biology Indonesian Journal of Forestry Research JURNAL ANALISIS KEBIJAKAN KEHUTANAN
Subekti Rahayu
World Agroforestry Centre
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology Veterinary

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TREE SPECIES COMPOSITION OF 1.8 HA PLOT SAMBOJA RESEARCH FOREST: 28 YEARS AFTER INITIAL FIRE Subekti Rahayu; Sambas Basuni; Agus Priyono Kartono; Agus Hikmat; Meine van Noordwijk
Indonesian Journal of Forestry Research Vol 4, No 2 (2017): Indonesian Journal of Forestry Research
Publisher : Secretariat of Agency for Standardization of Environment and Forestry Instruments

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1156.741 KB) | DOI: 10.20886/ijfr.2017.4.2.95-106

Abstract

Repeated forest fires highly impact on tree species composition. Forest planning requires information about the current condition of  species composition. This paper investigates the current tree composition of  natural regeneration after repeated forest fires,  regeneration process after repeated fires, and strategy of  secondary growth related to ecological restoration issues. Re-observation of  the 1.8 hectares permanent plot in Samboja Research Forest was conducted in 2011. All trees with diameters above 10 cm at breast height (DBH) were re-numbered and mapped. Herbarium specimen was collected for species identification. Number of  taxon was determined, Important Value Index was calculated, species trait of   light response was identified based on the references and dispersion index species was calculated. Results show after twenty eight years initial forest fire, 191 species naturally regenerated in the burnt area. Macaranga gigantea, a light demanding pioneer species of  Euphorbiaceae was the most dominant species, followed by Vernonia arborea belonging to Asteraceae. Both, M. gigantea and V. arborea had clumped distribution. Eight species identified survived from repeated fires, are Anthocephalus chinensis, Dipterocarpus cornutus, Diospyros borneensis, Eusideroxylon zwageri, Shorea ovalis, Syzygium borneensis, Pholidocarpus majadum and Vatica umbonata. All surviving species was distributed uniformly in the plot. Dominant pioneer species which has grown after repeated fires indicates that the current condition of  burnt forest is in the early succession. Protecting forest, assisting natural regeneration and monitoring dominant species are suggested as activities for the ecological restoration.
PEMETAAN PARA PIHAK DALAM PEMULIHAN KHDTK SAMBOJA Subekti Rahayu; Sambas Basuni; Agus Priyono Kartono; Agus Hikmat
Jurnal Analisis Kebijakan Kehutanan Vol 15, No 2 (2018): Jurnal Analisis Kebijakan Kehutanan
Publisher : Centre for Research and Development on Social, Economy, Policy and Climate Change

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (412.216 KB) | DOI: 10.20886/jakk.2018.15.2.127-142

Abstract

Forest and land rehabilitation at kawasan hutan dengan tujuan khusus (KHDTK) Samboja, East Kalimantan had been started in 1988. Many stakeholders were involved in the activities through different mechanisms. However, this program was still far beyond expectation as the success of the rehabilitation program was limited only at the research site of the KHDTK Samboja. Information on potential stakeholders and their roles in the program is needed to formulate a better plan that will be used as a guidance to achieve an effective, efficient and sustainable restoration program in the future. An interview with key informants using snowball sampling method was carried out in BPTKSDA Samboja to identify potential stakeholders that will be involved in the future restoration program, including their interests and possible impacts on the program. The result showed that there was 11 stakeholders that could be engaged in the future Samboja Research Forest Restoration Program; BPTKSDA Samboja, UPTD Tahura Bukit Soeharto, Foresty Officer, Mulawarman University and FOERDIA as key players; Dipterocarp Research Centre and Indonesia Institute of Science as context setter; land manager and forestry industrial companies as subject; non land manager and mining companies as crowd.
DOMINANCE, ASSOCIATION AND DISTRIBUTION PATTERN OF TREE SPECIES IN BURNT FOREST IN EAST KALIMANTAN Subekti Rahayu
BIOTROPIA - The Southeast Asian Journal of Tropical Biology Vol. 28 No. 1 (2021): BIOTROPIA Vol. 28 No. 1 April 2021
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (300.771 KB) | DOI: 10.11598/btb.0.0.0.907

Abstract

Repeated forest fires have high impact on species’ composition. Pioneer species colonize the burnt forest and develop widely up to 30 years after a fire but late-succession species regenerate gradually or even disappear owing to direct impact of fires or other ecological consequences related to fires. Forest restoration through assisted natural regeneration needs information about the state of species’ composition after fire. Species’ dominance is a species’ composition indicator used in this research, with additional information on species’ association and distribution patterns, to understand tree species’ composition after repeated fires. A 1.8-hectare plot divided into 10 x 10 m sub-plots was established in secondary forest in Samboja Research Forest, East Kalimantan. The plot sample was burnt in 1982/1983 and 1997/1998. All trees above 10 cm DBH were measured; leaf specimens were collected for species’ identification at the Herbarium Bogoriense, Cibinong, West Java. For comparison, we used 1981 data observed by the Indonesian Institute of Science, published by Kartawinata et al 2008. The Importance Value Index was used in the data analysis to express species’ dominance. A 2x2 matrix based on presence-absence of species for each sub-plot was used to analyse the association index among species. Variance and average value ratio of certain species present in each sub-plot was expressed in a dispersion index. A chi-square was used to test the significance of the association and dispersion index. Thirteen years after a second fire, pioneer species of Macaranga gigantea were most dominant, followed by Vernonia arborea, a sub-climax species. This indicated that the forest was in an early succession process. Pholidocarpus majadun was consistently dominant before and after the fire. We found 38 pairs of species significantly positively associated and 4801 pairs negatively associated. About 60% species’ association, both negatively and positively, occurred between ‘native species’ (species that exist befores burnt) and ‘non-native species’ (new comer species regenerated after burnt) in the plot sample. A non-native species, Vernonia arborea, associated negatively with the non-native species Tabernaemontana sphaerocarpa, and native species, Oncosperma horridum, Palaquium dasyphyllum and Endiandra rubescens. The distribution pattern of four native species—Artocarpus anisophyllus, Cananga odorata, Croton laevifolius and Macaranga gigantea—changed after repeated fires, from uniform to clumped.
Co-Authors Agus Hikmat Agus Priyono Kartono Meine van Noordwijk Sambas Basuni