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All Journal Jurnal Biologi Tropis EKOTONIA: Jurnal Penelitian Biologi, Botani, Zoologi dan Mikrobiologi Indonesian Journal of Community Empowerment
Harijayanti, Devita
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Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Decision Sciences, Operations Research & Management Immunology & microbiology Languange, Linguistic, Communication & Media Medicine & Pharmacology Social Sciences Other

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Diversity of Ferns (Pteridophyta) in the Bukit Pinteir Forest Central Bangka Harijayanti, Devita; Nisa, Amanatun; Partinisah, Firgia; Salsabila, Naqqiyah; Indira, Salsa; Ramadani, Suci Hajria; Izafah, Tari Zara; Amelia, Tia
Jurnal Biologi Tropis Vol. 25 No. 2 (2025): April-Juni
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v25i2.9044

Abstract

The aim of this study was to identify and analyze the diversity of ferns (Pteridophyta) in the secondary forest of Bukit Pinteir, Central Bangka. We collected the primary data through field observations conducted using the purposive sampling method, along with the measurement of abiotic factors at two stations with different altitudes (96 and 238 mdpl). The data were analyzed with important value index and Shannon-Wiener species diversity index (H’).  Twelve fern species from 10 families were identified, namely Dicranopteris linearis, Davallia denticulata, Nephrolepis cordifolia, Nephrolepis biserrata, Lygodium japonicum, Lygodium flexuosum, Coniogramme japonica, Blechnopsis orientalis, Asplenium nidus, Platycerium coronarium, Pteridium esculentum, and Stenochlaena palustris. Based on the results, Nephrolepis cordifolia was the most dominant species, with its important value index was 16.92, followed by Dicranopteris linearis and Blechnopsis orientalis. The Shannon-Wiener diversity index (H’ = 0.663) indicated low species diversity with uneven distribution. Abiotic factors such as temperature (30.1–30.5 °C), soil moisture (60–70%), air humidity (67–71%), and soil pH (6.5) reflected a microclimate favorable for fern growth. Many studies are still needed to record the diversity of ferns in Bukit Pinteir and increase species diversity to maintain environmental sustainability.
Pengaruh Temperatur Tinggi Terhadap Ketahanan Biji Kering dan Basah pada Zea mays, Vigna radiata dan Arachnis hypogea Harijayanti, Devita
EKOTONIA: Jurnal Penelitian Biologi, Botani, Zoologi, dan Mikrobiologi Vol 10 No 1 (2025): Ekotonia: Jurnal Penelitian Biologi, Botani, Zoologi dan Mikrobiologi
Publisher : Biology Study Program, Faculty of Science and Engineering, University of Bangka Belitung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/ekotonia.v10i1.6471

Abstract

Light is a major factor that regulates photomorphogenesis in plants, influencing the mechanisms of etiolation and de-etiolation. This study aims to evaluate the effect of light intensity on the growth and development parameters of Oryza sativa and Vigna sp. through comparative observation in light and dark conditions. The results showed that sprouts in dark conditions underwent etiolation, which was characterized by significant stem elongation, pale leaves, and fragile plant morphology. In contrast, in light conditions de-etiolation occurs, which results in shorter stems, green leaves, and a more robust plant structure. Quantitative parameters include epicotyl:hypocotyl ratio, stem length, root length, and stomata activity level. The results showed a higher epicotyl:hypocotyl ratio in dark conditions than light. This physiological mechanism involves phytochrome activity, which through its active form (Pfr) mediates the interaction of DELLA proteins with transcription factors PIFs, thereby inhibiting the expression of cell elongation genes. The activity of the stomata is higher in bright conditions, which supports the optimization of gas exchange for photosynthesis.The results of this research contribute to the development of sustainable agricultural systems and increase crop productivity.
Training in Tracker Software for Experimental Physics Education at SMA Plus Bahrul Ulum Afriani, Fitri; Harijayanti, Devita; Harahap, Apriliyani; Kusmita, Tri; Utami, Rizka; Tiandho, Yuant
Indonesian Journal of Community Empowerment (IJCE) Vol 7 No 2 (2026): Indonesian Journal of Community Empowerment (May)
Publisher : Fakultas Kewirausahaan Universitas Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35899/ijce.v7i2.1199

Abstract

Practical activities are an important component in physics learning because they help students understand concepts concretely through experiments and data analysis. This community service activity aims to improve the quality of physics learning by training students to use Tracker software as a video analysis-based practical media at SMA Plus Bahrul Ulum Sungailiat. The implementation method includes preparation, preparation of materials and guides, training, and evaluation. The material focused on mechanics concepts, namely free fall, parabolic motion, and simple pendulum motion. The training was conducted through the delivery of materials, discussion, and direct practice of video analysis using smartphones. The results showed an increase in teacher and student understanding and skills in technology-based practicals. The use of Tracker enables more efficient and accurate quantitative analysis, increases student engagement, and supports more active, meaningful STEM-based learning.
Co-Authors Amelia, Tia Fitri Afriani Harahap, Apriliyani Indira, Salsa Izafah, Tari Zara Nisa, Amanatun Partinisah, Firgia Ramadani, Suci Hajria Salsabila, Naqqiyah Tri Kusmita Utami, Rizka Yuant Tiandho