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All Journal BIOTROPIA - The Southeast Asian Journal of Tropical Biology
Sulistijorini Sulistijorini
Department of Biology, Faculty of Mathematics and Natural Sciences, Institut Pertanian Bogor, Bogor 16680
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology Veterinary

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DISTRIBUTION OF INVASIVE PLANT SPECIES IN DIFFERENT LAND-USE SYSTEMS IN SUMATERA, INDONESIA Indah Wahyuni; Sulistijorini Sulistijorini; Setiabudi Setiabudi; Ana Meijide; Miki Nomura; Holger Kreft; Katja Rembold; Sri Sudarmiyati Tjitrosoedirdjo; Soekisman Tjitrosoedirdjo
BIOTROPIA Vol. 23 No. 2 (2016): BIOTROPIA Vol. 23 No. 2 December 2016
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.2016.23.2.534

Abstract

Disturbances caused by the conversion of rain forests into agricultural systems provide an opportunity for the expansion of Invasive Plant Species (IPS). Bukit Duabelas National Park is one of the few remaining lowland forests in Jambi Province (Sumatera, Indonesia). The surrounding areas up to the national park borders have already been converted into jungle rubber agroforests as well as rubber and oil palm plantations which might lead to an increased spread of IPS into the forest. This study was aimed at compiling a list of IPS and determining their distribution and coverage of IPS in four land use systems (rain forest jungle rubber, rubber and oil palm plantations). Spatial distribution patterns were investigated by creating a horizontal vegetation profile diagram for the permanent plots of the EFForTS project (Ecological and Socioeconomic Functions of Tropical Lowland Rainforest Transformation Systems, http://www.uni-goettingen.de/crc990). The dominance of IPS was determined using Important Value Index. A total of forty IPS were identified across the four land-use systems. The numbers of IPS were the highest in oil palm (28 species) and rubber plantations (27 species), and the lowest in jungle rubber (10 species). IPS were absent in the lowland rain forest. The diversity of IPS was influenced by environmental factors, especially canopy openness. IPS with the highest ground coverage were Dicranopteris linearis and Clidemia hirta. Both of them were found in all three land-use systems outside the rain forest when the forest canopy opens due to illegal logging or other human disturbances. Therefore, reforestation of disturbed areas is recommended to prevent the spread of IPS.
POPULATION STRUCTURE OF Hoya spp. (APOCYNACEAE: ASCLEPIADOIDEAE) AT BODOGOL NATURE-CONSERVATION EDUCATION CENTER, INDONESIA Jessica Elfani Bermuli; Sulistijorini Sulistijorini; Sri Rahayu
BIOTROPIA Vol. 26 No. 2 (2019): BIOTROPIA Vol. 26 No. 2 August 2019
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (288.835 KB) | DOI: 10.11598/btb.2019.26.2.881

Abstract

Hoya species are epiphytic flowering plants known for their traditional medicinal value. Since 2011, eight Hoya species have been recorded at the Bodogol Nature-Conservation Education Center (BNCEC), Bogor, Indonesia. To support effective conservation measures, this study aimed to analyze the population structure and distribution patterns of Hoya species at BNCEC. Data were collected from July to August 2016 using a purposive sampling method within a 400 m² plot. The results showed that population structures varied among species. The population structure of H. multiflora formed an inverted pyramid, with more adult individuals than seedlings and juveniles. Both H. campanulata and H. imperialis exhibited a natural population pyramid, indicating a balanced proportion of seedlings, juveniles, and adults. H. lacunosa showed an hourglass-shaped structure, in which the numbers of seedlings and adults were higher than juveniles. H. hasseltii and H. vitellinoides did not display clear population structures because no adult individuals were observed. The distribution pattern of Hoya populations at BNCEC was clumped, as indicated by Morisita’s index (0.661).
Co-Authors Ana Meijide Holger Kreft Indah Wahyuni Jessica Elfani Bermuli Katja Rembold Miki Nomura Setiabudi Setiabudi Soekisman Tjitrosoedirdjo Sri Rahayu Sri Sudarmiyati Tjitrosoedirdjo