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All Journal Jurnal Silvikultur Tropika (JST) Jurnal Biologi Tropis Jurnal Laot Ilmu Kelautan Unri Conference Series: Community Engagement Jurnal Pengabdian Masyarakat (ABDIRA) Jurnal Ilmu-Ilmu Kehutanan Jurnal Pengabdian Masyarakat Bhinneka Jurnal Pengabdian Masyarakat Jurnal Riset dan Pengabdian Interdisipliner Biodiversitas Journal of Biological Diversity
Nugraha, Lefdi Agung
Jurusan Kehutanan, Fakultas Pertanian, Universitas Riau, Pekanbaru, 28293
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Environmental Science Immunology & microbiology Languange, Linguistic, Communication & Media Library & Information Science Nursing Public Health Social Sciences Other

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RESPON PEMBERIAN KOMPOS SERBUK GERGAJI GAHARU SEBAGAI MEDIA TANAM TERHADAP PERTUMBUHAN SEMAI TREMBESI (Samanea saman) Muhammad Mardhiansyah; Jesi Meirani; Pebriandi; Viny Volcherina Darlis; Ewi Irfani; Lefdi Agung Nugraha
Journal of Tropical Silviculture Vol. 17 No. 01 (2026): Jurnal Silvikultur Tropika
Publisher : Departemen Silvikultur, Fakultas Kehutanan dan Lingkungan, Institut Pertanian Bogor (IPB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/j-siltrop.17.01.10-21

Abstract

Salah satu vegetasi yang dijadikan sebagai alternatif dalam revegetasi lahan adalah anaman Trembesi (Samanea saman). Tumbuhan trembesi dapat tumbuh dengan baik jika diberikan unsur hara yang baik yaitu dengan campuran tanah dengan bahan orgnaik. Bahan organik yang berpotensi untuk perbaikan sifat fisik tanah adalah serbuk gergaji. Tujuan penelitian ini dilakukan untuk mengetahui pengaruh pemberian kompos serbuk gergaji gaharu sebagai media tanam dan untuk mengetahui komposisi optimal media tanam kompos serbuk gergaji gaharu terhadap pertumbuhan semai trembesi. Metode pengamatan ini dilakukan dengan memperhatikan persentase hidup, pertambahan tinggi semai dan diameter batang, nilai kekokohan, berat kering total, nisbah pucuk akar dan indeks mutu bibit. Data yang didapatkan kemudian dianalisis sidik ragam secara statistik menggunakan software SPSS versi 17.0. Kesimpulan dalam penelitian ini yaitu bahwa pemberian kompos serbuk gergaji gaharu berpengaruh terhadap persentase hidup, tinggi, diameter, dan kekokohan semai terhadap semai trembesi dan Komposisi optimal kompos serbuk gergaji gaharu terhadap pertumbuhan semai trembesi yaitu perlakuan P3 dimana rata-rata persentase hidup 60%, pertambahan tinggi 2,98 cm, pertambahan diameter 1,13 mm, nilai kekokohan semai 8,46, nisbah pucuk akar 1,56, dan indekd mutu bibit 1,86.
Analysis of the Physical and Chemical Properties of Soil in the Riau University Arboretum Pebriandi Pebriandi; Gilang Panca Marsanda; Zeki Desvita; Efilda Sari; Vinny Volcherina Darlis; Yossi Oktorini; Ewi Irfani; Lefdi Agung Nugraha; Hutami Indah Pertiwi
Jurnal Biologi Tropis Vol. 26 No. 1 (2026): Januari-Maret
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.v26i1.10805

Abstract

Soil is an important component of forest ecosystems because it acts as a provider of nutrients, a support for vegetation, and a regulator of biogeochemical cycles. Variations in the physical and chemical properties of soil are greatly influenced by vegetation cover and soil depth. This study aims to analyse the chemical properties of soil in two types of vegetation cover, namely dense and moderate cover, in the Riau University Arboretum, which was determined using the Normalised Difference Vegetation Index (NDVI) method. Soil samples were taken at three depths (0–10 cm, 10–20 cm, and 20–30 cm) to determine the vertical variation in soil chemical properties. The parameters analysed included pH, organic carbon (organic C), total nitrogen (total N), phosphorus (P₂O₅), and potassium (K₂O). The results showed that soil pH was in the acidic category, ranging from 4.43 to 5.21. Organic carbon content was higher in the surface layer than in the lower layers, with the highest value of 5.14% in medium cover. Total N content was low in all samples (0.11–0.25%), indicating a limitation of nitrogen as a factor restricting vegetation growth. The nutrient elements P₂O₅ and K₂O tended to be higher in the surface layer, especially in dense cover (P₂O₅ = 26.66 mg/100 g; K₂O = 24.56 mg/100 g). In general, dense cover was able to maintain nutrient availability better than medium cover, although medium cover had relatively higher organic C content on the surface. These findings confirm that vegetation cover plays an important role in maintaining soil quality, and the preservation of dense vegetation needs to be optimised to support soil fertility and the sustainable conservation function of the arboretum.
Leaf Morphology and Functional Traits of Four Mangrove Seedling Species Under Nursery Conditions Lefdi Agung Nugraha; Pebriandi Pebriandi; Viny Volcherina Darlis; Muhammad Mardhiansyah; Ewi Irfani
Jurnal Biologi Tropis Vol. 26 No. 3 (2026): Juli - September
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.v26i3.11822

Abstract

Mangrove species exhibit variations in leaf functional traits that reflect differences in resource-use strategies; however, information on the coordination of these traits during the seedling stage remains limited. This study aimed to evaluate leaf functional trait variation among four mangrove species (Avicennia alba, Bruguiera gymnorrhiza, Bruguiera parviflora, and Rhizophora apiculata) by analyzing leaf economic traits, leaf morphological traits, and their interrelationships. A total of 120 seedlings grown under relatively uniform nursery conditions were evaluated. The measured traits included Specific Leaf Area (SLA), Leaf Dry Matter Content (LDMC), Aspect Ratio (AR), and Shrinkage Index (SI). Data were analyzed using descriptive statistics, one-way analysis of variance (ANOVA) followed by Duncan's Multiple Range Test (DMRT), and Principal Component Analysis (PCA). The results showed that all measured traits differed significantly among species (P < 0.05), with effect sizes ranging from moderate to very large. PCA revealed that the first two principal components explained 73.75% of the total variation in leaf traits, indicating that interspecific variation was driven by the coordination of multiple leaf traits rather than by a single trait. These findings demonstrate that a multivariate approach provides a more comprehensive understanding of leaf functional trait variation among mangrove seedlings.
Peningkatan Pengetahuan Masyarakat Desa Kuala Tolam tentang Mitigasi Bencana Ekosistem Gambut Partisipatif Gandhiko Mohta; Maryani Maryani; Erwanda Trio Bintan Sabri; Anesha Allasselcida; Dinda Tri Agustina; Lefdi Agung Nugraha; Agung Kartika Putra; Hanifah Ikhsani; Evi Sribudiani; Nurul Qomar; Muhammad Mardhiansyah
Jurnal Pengabdian Masyarakat (ABDIRA) Vol 6, No 2 (2026): Abdira, April
Publisher : Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/abdira.v6i2.1823

Abstract

This community service activity aimed to improve the knowledge of residents of Kuala Tolam Village regarding drought control, flood management, peatland ecosystems, and riverbank landslide mitigation in areas vulnerable to hydrometeorological hazards. The education program was conducted through material delivery, discussions, and pre-test and post-test evaluations using a questionnaire. Data were analyzed using IBM SPSS Statistics 20 to describe respondent characteristics and to examine knowledge improvement using a paired sample t-test. The results showed that 66.67% of participants were initially in the low knowledge category; however, after the intervention, all participants improved to the moderate and high categories. The mean knowledge score increased from 47.33 to 69.73, with a statistically significant difference (p 0.05). This improvement was supported by the relevance of the materials, including peatland hydrology, drought control, flood mitigation, and riverbank bioengineering. Participatory education is therefore important for strengthening community capacity and village preparedness in managing environmental risks in peatland ecosystems.
Co-Authors Adisti Permatasari Putri Hartoyo Ahmad Albar Anesha Allasselcida CECEP KUSMANA Defri Yoza Dinda Tri Agustina Efilda Sari Eka Hidyatulah Erwanda Trio Bintan Sabri Evi Sribudiani Ewi Irfani Fadli, Zulkhoiri Feny Oktaningsih Gandhiko Mohta Gilang Panca Marsanda Hanifah Ikhsani Hutami Indah Pertiwi Ika Lestari Ika Lestari Hutasuhut Ika Lestari Hutasuhut Jesi Meirani KUNCORO, IWAN - Maryani Maryani Maryani Maryani Maryani Maryani Masruri, Niskan Walid Muhammad Mardhiansyah Nur Suhada, Nur Nurul Qomar Pebriandi, Pebriandi Putra, Agung Kartika Sabri, Erwanda Tri Bintan Somadona, Sonia Vinny Volcherina Darlis Viny Volcerina Darlis Viny Volcherina Darlis Wahyu Tegar Pratama Yossi Oktorini Zeki Desvita