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Soekisman Tjitrosoedirdjo
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology Veterinary

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ABIOTIC FACTORS INFLUENCING MANTANGAN (Merremia peltata) INVASION IN BUKIT BARISAN SELATAN NATIONAL PARK Jani Master; Soekisman Tjitrosoedirdjo; Ibnul Qayim
BIOTROPIA - The Southeast Asian Journal of Tropical Biology Vol. 23 No. 1 (2016)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (311.21 KB) | DOI: 10.11598/btb.2016.23.1.457

Abstract

Some areas in Bukit Barisan Selatan National Park have serious problems related to Merremia peltata (Family Convolvulaceae) invasion. The abiotic factors influencing M. peltata invasion were investigated in this study. This research compared abiotic factors in three forest locations with different invasion levels i.e.severe, moderate and mild invasions. Abiotic factors measured were percentage of tree canopy coverage, micro climate factors (temperature and humidity), elevation above sea level and physical and chemical properties of the soil surface. In this study, canopy coverage is classified as abiotic factors because it influencesthe intensity of light that can reach the forestfloor. Aposthoc Duncan's Multiple Range Test (DMRT) was employed to determine significant differences (p<0.05) among abiotic factors. In addition, a test of correlation and multiple linear regression were conducted to determine the relationships between abiotic factors and M. peltata invasion. Multiple regression testing showed that canopy coverage significantly (p<0.05) influenced M. peltata invasion. Based on the generated model, a 1% addition of canopy coverage would decrease M. peltata invasion by 2.8%. Multiple linear regression analysis was used to predict the relationship between soil nutrients and invasion. The C/N ratio and P2O5, Ca, Mg and Na concentration significantly (p<0.05) influenced invasion level. Again, based on the generated model, the increase in the C/N ratio aswell as in P2O5 and Ca concentrations were correlated with the reduction of M. peltata invasion; while the increase of Mg and Na concentrations were correlated with the increase of M. peltata invasion. M. peltata invasion in Bukit Barisan Selatan National Park was influenced by opened forest canopy andwas correlated with high concentration of Na and Mg in the soil of the invaded forest areas.Keywords: Bukit Barisan Selatan National Park, invasive species, mantangan, Merremia peltata
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 - The Southeast Asian Journal of Tropical Biology Vol. 23 No. 2 (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.
Co-Authors Ana Meijide Holger Kreft IBNUL QAYIM Indah Wahyuni Jani Master Katja Rembold Miki Nomura Setiabudi Setiabudi Sri Sudarmiyati Tjitrosoedirdjo