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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.
Ornamental Palm Species of Palu City, Central Sulawesi, Indonesia Tiwatu, Amila Farwizah; Ramadanil, Ramadanil; Bilbina, Zahwa Arzeti; Cahyani, Regita; Nugraha, Muhammad Ardian Satrio; Amar, Amar; Sangadji, Muhd Nur
JURNAL BIOS LOGOS Vol. 14 No. 3 (2024): JURNAL BIOS LOGOS
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jbl.v14i3.58284

Abstract

A research-entitled ornamental palm species of Palu city, central Sulawesi, Indonesia has been conducted from May to September 2024.  The goal of the study was to document ornamental palm in Palu City. The direct observation through botanical exploration method was performed to inventory ornamental plant in 8 districts of Palu. All ornamental palms samples were collected and photographed then identified at the Laboratory of Plant Biosystematics, Department of Biology, Faculty of Mathematics and Natural Sciences and the Herbarium Celebense (CEB), Tadulako University Palu. Additional data included local name, botanical name, family, plant habitus (life form), were noted. Specimens with their label were deposited  at CEB, Tadulako University Palu, Indonesia. There were 16 (sixteen) ornamental palms namely: Areca cathechu, Cocos nucifera, Phoenix dactilyfera, Elaeis guineensis, Cyrtostachys renda, Corypha utan, Roystonia regia, Saribus rotundifolius, Wodyetia bifurcata, Adonidia merrilii, Hyophorbe lagenicaulis, Chrysalidocarpus decaryi, Bismarckia nobilis, Chamaedorea elegans, Licuala grandis, and Rhapis excelsa