UT - Faculty of Forestry and Environment

Pengaruh Paparan Panas terhadap Kesehatan Pekerja pada Kegiatan Delimbing di KPH Cepu, Jawa Tengah

Thu, 01 Jan 2026 00:00:00 GMT

Pengaruh Paparan Panas terhadap Kesehatan Pekerja pada Kegiatan Delimbing di KPH Cepu, Jawa Tengah SRI, NJIMOU PAULINE MERLIN Kegiatan delimbing merupakan tahapan pemanenan kayu yang dilakukan di ruang terbuka dengan beban kerja fisik berat sehingga berpotensi menimbulkan tekanan panas pada operator chainsaw. Penelitian ini bertujuan mengidentifikasi tingkat paparan panas berdasarkan indeks Wet Bulb Globe Temperature (WBGT), mengidentifikasi gejala heat strain dan persepsi kenyamanan termal pekerja, serta menganalisis hubungan antara WBGT dengan heat strain dan kenyamanan termal pada kegiatan delimbing di KPH Cepu, Jawa Tengah. Pengukuran iklim kerja dan suhu tubuh dilakukan pada sesi pagi dan sesi siang, bersamaan dengan data heat strain dan kenyamanan termal yang dikumpulkan melalui wawancara. Hasil penelitian berdasarkan uji korelasi Spearman menunjukkan bahwa WBGT berkorelasi positif signifikan dengan heat strain (? = 0,369; p < 0,05) dan berkorelasi negatif signifikan dengan kenyamanan termal (? = -0,414; p < 0,05). Temuan ini menegaskan bahwa peningkatan tekanan panas lingkungan diikuti oleh peningkatan respons fisiologis pekerja dan penurunan kenyamanan termal. Kondisi tersebut menunjukkan perlunya pengendalian paparan panas pada kegiatan delimbing untuk mendukung perlindungan kesehatan pekerja.; Delimbing is a timber harvesting activity conducted in open areas with considerable physical workload, which exposes chainsaw operators to environmental heat pressure. This study aimed to identify heat exposure levels based on the Wet Bulb Globe Temperature (WBGT), examine heat strain symptoms and thermal comfort perception, and analyze the relationship between WBGT, heat strain, and thermal comfort during delimbing activities at KPH Cepu, Central Java. Measurements of work climate parameters and body temperature were carried out in the morning session and afternoon session, along with heat strain and thermal comfort data collected through individual interviews. The results based on Spearman correlation test shows that WBGT has a significant positive correlation with heat strain (? = 0.369; p < 0.05) and a significant negative correlation with thermal comfort (? = -0.414; p < 0.05). These findings confirm that increasing environmental heat pressure elevates workers’ physiological responses and reduces thermal comfort. The study highlights the need for effective heat exposure control in delimbing operations to support occupational health protection.

PENGARUH PENGAWETAN MENGGUNAKAN BORAKS DAN ASAM BORAT TERHADAP KARAKTERISTIK DAN SIFAT MEKANIS TEKAN SERTA LENTUR CAKRAM (Flat Ring Flexure) BAMBU BETUNG

Thu, 01 Jan 2026 00:00:00 GMT

PENGARUH PENGAWETAN MENGGUNAKAN BORAKS DAN ASAM BORAT TERHADAP KARAKTERISTIK DAN SIFAT MEKANIS TEKAN SERTA LENTUR CAKRAM (Flat Ring Flexure) BAMBU BETUNG RAADI, ASYURA ZAHRA LUTFFIA Bambu betung memiliki potensi besar sebagai material konstruksi, namun rentan terhadap serangan organisme perusak. Penelitian ini bertujuan untuk mengkaji pengaruh pengawetan menggunakan boraks dan asam borat terhadap sifat mekanis tekan dan lentur cakram bambu betung. Pengawetan dilakukan dengan metode perendaman selama 72 jam dengan berbagai perlakuan konsentrasi, rasio bahan pengawet serta posisinya dalam buluh bambu. Hasil penelitian menunjukkan bahwa peningkatan konsentrasi pengawet meningkatkan nilai retensi secara signifikan, dengan nilai tertinggi (3,82 kg m?³) pada konsentrasi 7,5% dengan rasio boraks:asam borat 0:1 pada bagian pangkal. Pengawetan cenderung meningkatkan kadar air contoh uji dibandingkan kontrol akibat penetrasi larutan. Secara keseluruhan, perlakuan pengawetan memberikan pengaruh yang nyata terhadap sifat fisis dan mekanis, di mana kombinasi rasio dan konsentrasi yang tepat diperlukan untuk mencapai efektivitas pengawetan optimal tanpa menurunkan kekuatan bambu secara drastis. Kata kunci: Asam borat, bambu betung, boraks, pengawetan, lentur cakram; Betung bamboo has great potential as a construction material but is highly susceptible to wood-destroying organisms. This study aims to investigate the influence of borax and boric acid preservation on the mechanical properties compression and flexural strength of betung bamboo. Preservation was conducted through a 72-hour soaking method with various concentration treatments, preservative ratios and their positions in the bamboo culms. The results showed that increasing the preservative concentration significantly increased the retention value, with the highest value (3.82 kg m?³) found at 7.5% concentration with a 0:1 borax-to-boric acid ratio at the bottom part. Preservation tended to increase the moisture content of the samples compared to the control due to solution penetration. Overall, the preservation treatments significantly influenced physical and mechanical properties, indicating that appropriate combinations of ratio and concentration are required to achieve optimal preservation effectiveness without drastically reducing the bamboo's strength. Keywords: Borax, boric acid, betung bamboo, flat ring flexure, preservation.

Identifikasi Cendawan Endofit dari Tanaman Leda (Eucalyptus deglupta) dan Potensinya dalam Menghambat Patogen Hawar Daun secara in Vitro

Thu, 01 Jan 2026 00:00:00 GMT

Identifikasi Cendawan Endofit dari Tanaman Leda (Eucalyptus deglupta) dan Potensinya dalam Menghambat Patogen Hawar Daun secara in Vitro RAHMADHANTI, INTAN NUR Tanaman leda (Eucalyptus deglupta) merupakan spesies kehutanan bernilai ekonomis tinggi yang rentan terhadap penyakit hawar daun akibat sistem monokultur. Pengendalian ramah lingkungan dapat dilakukan melalui pemanfaatan cendawan endofit sebagai agen biokontrol. Penelitian ini bertujuan mengidentifikasi cendawan endofit dari E. deglupta secara morfologi dan molekuler serta mengevaluasi potensinya dalam menghambat patogen hawar daun secara in vitro. Sebanyak empat isolat cendawan endofit diuji terhadap tiga patogen (Rhizoctonia sp., Colletotrichum sp., dan Pestalotiopsis sp.) menggunakan metode dual culture. Identifikasi molekuler dilakukan menggunakan analisis filogenetik dengan penanda ITS. Hasil menunjukkan isolat REI9.1 dan DEI6.1 berkerabat dekat dengan Phyllosticta fallopiae, REC19.1 dengan Xenoacremonium recifei, dan DEC1.1 dengan Pseudopithomyces toxicarius. Isolat DEC1.1 menunjukkan daya hambat tertinggi terhadap seluruh patogen (75,39%), sementara REI9.1 tertinggi terhadap Colletotrichum sp. (71,97%), DEI6.1 terhadap Rhizoctonia sp. (77,85%) dan Pestalotiopsis sp. (76,36%), serta REC19.1 terhadap Rhizoctonia sp. (41,63%). Isolat DEC1.1 (Pseudopithomyces toxicarius) berpotensi sebagai agen hayati yang potensial dalam menghambat patogen hawar daun pada tanaman E. deglupta secara in vitro.; The Leda plant (Eucalyptus deglupta) is a forest species with high economic value that is susceptible to leaf blight disease due to monoculture systems. Environmentally friendly disease management can be achieved through the use of endophytic fungi as biocontrol agents. This study aimed to identify endophytic fungi from E. deglupta based on morphological and molecular characteristics and to evaluate their potential to inhibit leaf blight pathogens in vitro. Four endophytic fungal isolates were tested against three pathogens (Rhizoctonia sp., Colletotrichum sp., and Pestalotiopsis sp.) using the dual culture method. Molecular identification was conducted using phylogenetic analysis based on the ITS marker. The results showed that isolates REI9.1 and DEI6.1 were closely related to Phyllosticta fallopiae, REC19.1 to Xenoacremonium recifei, and DEC1.1 to Pseudopithomyces toxicarius. Isolate DEC1.1 showed the highest inhibition against all pathogens (75.39%), while REI9.1 showed the highest inhibition against Colletotrichum sp. (71.97%), DEI6.1 against Rhizoctonia sp. (77.85%) and Pestalotiopsis sp. (76.36%), and REC19.1 against Rhizoctonia sp. (41.63%). Isolate DEC1.1 (Pseudopithomyces toxicarius) shows strong potential as a biocontrol agent in inhibiting leaf blight pathogens in E. deglupta under in vitro conditions.

Penerapan Metode VESS (Visual Evaluation of Soil Structure) pada Lahan Agroforestri dan Hutan Alam

Thu, 01 Jan 2026 00:00:00 GMT

Penerapan Metode VESS (Visual Evaluation of Soil Structure) pada Lahan Agroforestri dan Hutan Alam Tampubolon, Dea Irene Konversi hutan menjadi lahan non-hutan seperti pertanian dan perkebunan dapat menurunkan kualitas fisik tanah. Agroforestri menjadi alternatif pengelolaan lahan yang memberikan manfaat ganda, yaitu dari segi ekologi dan ekonomi. Penelitian ini bertujuan menganalisis nilai Visual Evaluation of Soil Structure (VESS), sifat fisik tanah, serta hubungan keduanya pada hutan alam, agroforestri kompleks, dan agroforestri sederhana di Kabupaten Tapanuli Utara. Parameter yang diukur meliputi skor VESS, bobot isi, porositas, kadar air, dan kerapatan vegetasi dengan analisis uji pengaruh dan korelasi Pearson. Hasil menunjukkan nilai VESS berkisar Sq 1,16–2,40, dengan hutan alam terbaik (Sq 1,16), diikuti agroforestri kompleks (Sq 1,52), dan agroforestri sederhana (Sq 2,40). Sifat fisik tanah menunjukkan pola yang sama, yaitu hutan alam dan agroforestri kompleks memiliki bobot isi lebih rendah serta porositas dan kadar air lebih tinggi dibandingkan agroforestri sederhana. Nilai VESS berkorelasi sangat kuat dengan sifat fisik tanah, sehingga dapat digunakan sebagai metode yang cepat dan efektif dalam menilai sifat fisik tanah pada berbagai tipe tutupan lahan.; The conversion of forests into non-forest land, such as agriculture and plantations, can reduce soil physical quality. Agroforestry serves as an alternative land management system that provides both ecological and economic benefits. This study aimed to analyze Visual Evaluation of Soil Structure (VESS) scores, soil physical properties, and their relationships in natural forest, complex agroforestry, and simple agroforestry in North Tapanuli Regency. The parameters measured included VESS scores, bulk density, porosity, soil moisture content, and vegetation density, which were analyzed using analysis of variance and Pearson correlation. The results showed that VESS values ranged from Sq 1.16 to 2.40, with natural forest having the best condition (Sq 1.16), followed by complex agroforestry (Sq 1.52), and simple agroforestry (Sq 2.40). Soil physical properties showed a consistent pattern, where natural forest and complex agroforestry had lower bulk density and higher porosity and soil moisture compared to simple agroforestry. VESS values showed very strong correlations with soil physical properties, indicating that the VESS method can be used as a rapid and effective approach for assessing soil physical quality across different land cover types.