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All Journal Jurnal Penelitian Pendidikan IPA (JPPIPA)
Rukmi
Universitas Tadulako
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Materials Science & Nanotechnology Physics

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Physical and Chemical Characteristics of Soil in the Habitat of Gymnostoma rumphianum (Miq.) L.A.S. Johnson in Tojo Una-Una Regency, Central Sulawesi Rahmawati; Yusran; Zulkaidhah; Retno Wulandari; Rukmi; Ramadanil Pitopang
Jurnal Penelitian Pendidikan IPA Vol 12 No 6 (2026)
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v12i6.15120

Abstract

Sulawesi, particularly the Wallacea region, has a unique yet extreme ultramafic ecosystem for vegetation growth due to nutrient limitations and high heavy metal concentrations. This study aims to analyze the characteristics of the physical and chemical properties of the soil in the habitat of Gymnostoma rumphianum (Miq.) L.A.S. Johnson in Tojo Una-Una Regency, Central Sulawesi. The study was conducted in Betaua and Podi Villages by dividing the locations based on distance from the river flow. Physical parameters analyzed included bulk density, soil texture, and permeability, while chemical parameters included N, P, K, pH, organic C, C/N ratio, and electrical conductivity (DHL). The results showed that the soil texture in Betaua Village was dominated by sand fractions, while Podi Village was dominated by silt fractions due to the influence of river sedimentation. Chemically, the soil is alkaline (pH 8.05–8.28) with low to very low nitrogen and phosphorus content, but has moderate potassium availability. The presence of G. rumphianum, an actinorhizal plant capable of fixing nitrogen, is a key factor in the adaptation and sustainability of vegetation in this marginal land. This study concludes that despite extreme edaphic constraints, soil-plant interactions and local environmental dynamics such as fluviality significantly determine the structure of the ultramafic habitat in the region.
The Effects of Tourist Activities on Bird Species Diversity in the Tambing Lake Area, Lore Lindu National Park, Central Sulawesi, Indonesia Sustri; Sri Ningsih; Naharuddin; Rukmi; Alam Ansary
Jurnal Penelitian Pendidikan IPA Vol 12 No 6 (2026)
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v12i6.15129

Abstract

The increase in tourism activity in the Lake Tambing area has the potential to put pressure on the ecosystem, especially on wildlife that is sensitive to human disturbance. Lake Tambing located in Lore Lindu National Park, Central Sulawesi, is an area of ​​high ecological value and home to a variety of endemic flora and fauna. This study aimed to analyze the potential of fauna, particularly bird populations, as indicators of ecological conditions and to observe the impact of tourism activities on bird diversity. The study was conducted from February to June 2025 at the camping ground and on the trackings trail using the line transect method. Data analysis included the Shannon-Wiener diversity index, evenness index, dominance index, and t-tests for comparisons between habitats. The study identified 56 bird species from 30 families, of which 26 are endemic to Sulawesi. Diversity index values ​​ranged from 2.79 to 3.28, indicating moderate to high levels of diversity. Statistical tests showed that tourist activity had no significant impact on bird diversity in either habitat type. This indicates that anthropogenic disturbance at Lake Tambing remains at a low level. These findings provide an important scientific basis for sustainable tourism practices, standardization of birdwatching site design, and effective endemic species conservation efforts in the Lake Tambing area.
Co-Authors Alam Ansary Naharuddin Rahmawati Ramadanil Pitopang Retno Wulandari Sri Ningsih Sustri Yusran Yusran Zulkaidhah