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All Journal BIOLINK (Jurnal Biologi Lingkungan, Industri, Kesehatan) Jurnal Pertanian Agros JURNAL AGROHITA Best Journal (Biology Education, Sains and Technology) IJOEP : International Journal of Ecophysiology Jurnal Agro Estate Jurnal Agro Estate
Aulia Juanda Djaingsastro
Institut Teknologi Sawit Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Public Health Other

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Identifikasi Gulma Pada Perkebunan Kelapa Sawit (Elaeis guieensis Jacq) Di Afdeling I Kebun Pabatu PTP. Nusantara IV Djaingsastro, Aulia Juanda
BEST Journal (Biology Education, Sains and Technology) Vol 8, No 1 (2025): Juni 2025
Publisher : Program Studi Pendidikan Biologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/best.v8i1.10713

Abstract

Sifat gulma yang berbeda-beda menentukan besarnya persaingan antar gulma dan tingkat kerapatan yang tinggi melibihi ambang kerusakan tanaman, menyebabkan hasil tanaman menurun. Penelitian ini bertujuan untuk jenis-jenis gulma pada tanaman menghasilkan dan yang dominan, penelitian dilaksanakan di afdeling I Kebun Pabatu PTP Nusantara IV dari bulan April – Juni 2022. Penelitian ini menggunakan metode analisis vegetasi tumbuhan bawah menggunakan teknik purposive sampling. Parameter yang diamati yaitu pada Tahun 2013,2016,2018 dengan menggunakan plot besar 60 m dan 20 m sedangkan satu petak plot kecil berukuran 1x1 m yang terdapat 6 plot didalamnya. Data yang akan diukur untuk menduga gulma dominan yang berada pada plot adalah kerapatan, frekuensi, dan dominansi gulma. Pada ketiga tahun tanam terdapat 21 jenis gulma yang terdapat pada 36 petak (plot). Data yang di peroleh Spesies gulma yang mendominasi tumbuh pada areal tanaman kelapa sawit tahun tanam 2013 Cyperus kyllingia dengan INP 33% gulma yang tidak dominan Caladium bicolour dengan INP 2%, pada tahun tanam 2016 gulma yang tumbuh mendominasi Ageratum conyzoides dengan INP 33% gulma yang tidak dominan Phyllanthus urinaria dengan INP 2%, pada tahun 2018 gulma yang tumbuh mendominasi Asystasia intrusa dengan INP 26% gulma yang tidak dominan Brachiaria mutica dengan INP 2%
Assessing Environmental Drivers of the Distribution of the Rare Species Johannesteijsmannia altifrons: a literature review Siregar, Etti Sartina; Djaingsastro, Aulia Juanda
International Journal of Ecophysiology Vol. 7 No. 1 (2025): International Journal of Ecophysiology
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/ijoep.v7i1.19062

Abstract

Johannesteijsmannia altifrons, a palm species exhibits unique dispersal mechanisms and distribution patterns that are critical to understanding its ecological dynamics. Dispersal has a significant impact on this species' spatial distribution and population dynamics. The distribution is significantly influenced by altitude, which affects its growth and habitat suitability. Publications and references in this analysis came from scientific articles published in bibliographic databases such as Scopus and Google Scholar. The keyword search used was “Johannesteijsmannia altifrons”. The authors examined the literature related to the subject of the systematic review, assessed methodological rigor, analyzed the results being reported in the selected studies. Condensed and organized the data before incorporating the findings into a comprehensive systematic review in narrative form. The distribution of J. altifrons in Indonesia is mainly in the Sumatra region, especially in the Northern and Central parts of the island. Taman Nasional Gunung Leuser (TNGL), Bukit Bungkuk Nature Reserve Forest and the surrounding lowland forests are good habitats. This species has habitat suitability at range elevations 20-500 meters (asl), very steep slopes (≥ 45%). Optimal growth occurs under tree canopies, which provide the necessary shade for the plant to thrive. This suggests a specific habitat preference that influences its distribution
Co-Authors Angelus Nababan Arfianti, Dina Aris Sukariawan Ayanda Oloan Simbolon Binsar Mangatur Tua Sinambela Diki Sapti Purnama Eka Bobby Febrianto, Eka Bobby etti sartina siregar Fajar Nawawi Febriana Roosmawati Hardiansyah Sinaga Havier Situmorang Ingrid Ovie Yosephine Kanda Haswen Khairuna Utami Manurung, Saroha Mardiana Wahyuni Monang Antonius Purba Muhammad Zaini Nuraida Nuraida Ranto Mangasi Sitorus Rudyanto Marpaung Siburian, Samura Natanael Suci Wandani Tarigan, Rani Yasser Subroto Ginting