Ritonga, Faujiah Nurhasanah
Faculty Of Forestry, Universitas Sumatera Utara. Jl. Lingkar USU, Durin Tunggal, Pancur Batu, Deli Serdang 20353, North Sumatera, Indonesia

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Sifat Tanah dan Pola Curah Hujan pada Perkebunan Kayu Manis (Cinnamomum burmannii) di Mandailing Natal, Sumatera Utara: Soil Properties and Rainfall Regimes in Cinnamon (Cinnamomum burmannii) Plantations in Mandailing Natal, North Sumatra Ritonga, Faujiah Nurhasanah; Lestari, Andi Tri; Susilowati, Arida; Pelawi, Deanova Frestiana Br; Anna, Nelly; Hartini, Kansih Sri; Elfiati, Deni
PERENNIAL Vol 22 No 1 (2026): Vol. 22 No. 1, April 2026
Publisher : Forestry Faculty of Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24259/perennial.v22i1.49583

Abstract

The sustainable cultivation of Cinnamomum burmannii in tropical regions requires a thorough understanding of soil properties and rainfall patterns, as these factors critically influence nutrient availability, plant growth, and long-term productivity. This study evaluates the soil properties and climatic conditions of Sawahan Village, Mandailing Natal Regency, to assess their suitability for the cultivation of C. burmannii. Soil samples were analyzed for physical and chemical characteristics, including organic carbon, total nitrogen, phosphorus, potassium, pH, exchangeable aluminum, macro- and micronutrients, and soil texture. Rainfall data over 25 years were also examined to understand the water availability and potential influence on soil fertility. The results indicate that the soils possess moderate organic matter and nutrient content, slightly acidic to near-neutral pH, absence of exchangeable aluminum toxicity, and a sandy loam texture conducive to drainage and root growth. The region experiences high and well-distributed rainfall, which supports perennial crop development but may increase nutrient leaching in sandy soils. These findings suggest that Sawahan Village provides favorable conditions for C. burmannii cultivation, provided that sustainable soil management practices, such as organic amendments, balanced fertilization, and erosion control, are implemented. The study highlights the importance of integrating climatic and soil assessments to optimize cinnamon productivity and provides baseline data for future land management and agroforestry planning in tropical regions.
Population genetics and ecology of Sumatran camphor (Dryobalanops aromatica) in natural and community-owned forests in Indonesia FAUJIAH NURHASANAH RITONGA; FIFI GUS DWIYANTI; CECEP KUSMANA; ULFAH JUNIARTI SIREGAR; ISKANDAR ZULKARNAEN SIREGAR
Biodiversitas Journal of Biological Diversity Vol. 19 No. 6 (2018)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d190625

Abstract

Ritonga FN, Dwiyanti FG, Kusmana C, Siregar UJ, Siregar IZ. 2018. Population genetics and ecology of Sumatran camphor (Dryobalanops aromatica) in natural and community-owned forests in Indonesia. Biodiversitas 19: 2175-2182. Dryobalanops aromatica Gaertn. f. (Sumatran camphor) is a valuable tree species that produces borneol (camphor) and good-quality timber. However, the population of this species has declined due to illegal logging and conversion of forests into plantations and has been classified as Critically Endangered by the International Union for Conservation of Nature. This study aimed to examine the genetic variation and spatial distribution of this species in a community-owned forest (Barus) and two natural forests (Singkohor and Danau Paris) in Indonesia using the Random Amplified Polymorphic DNA marker. The results of this study showed that D. aromatica had moderate levels of genetic variation (expected heterozygosity [He] = 0.1760 [Barus population] to 0.2134 [Singkohor population]) and genetic differentiation (Nei’s Gst = 0.1257). The genetic distance was the smallest between the Singkohor and Danau Paris populations (Nei’s distance = 0.0363) and greatest between the Singkohor and Barus populations (Nei’s distance = 0.0534). The spatial distribution of D. aromatica was grouped in both Barus and Danau Paris based on Morisita’s index of diversity (ip = 0.06 and 0.043, respectively). These findings indicated that genetic conservation might be performed in situ in combination with enrichment planting using locally propagated sources.
Evaluation of sea turtle handling methods in a captive facility in Nipah, Indonesia MAISER SYAPUTRA; ENDAH WAHYUNINGSIH; PANDE KOMANG SUPARYANA; ANDI TRI LESTARI; BUDHY SETIAWAN; FAUJIAH NURHASANAH RITONGA
Biodiversitas Journal of Biological Diversity Vol. 26 No. 11 (2025)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d261122

Abstract

Abstract. Syaputra M, Wahyuningsih E, Suparyana PK, Lestari AT, Setiawan B, Ritonga FN. 2025. Evaluation of sea turtle handling methods in a captive facility in Nipah, Indonesia. Biodiversitas 26: 5626-5637. Animal welfare is crucial for sea turtles in captivity and is guided by several principles: freedom from hunger and thirst; freedom from discomfort; freedom from pain, injury, or disease; freedom from fear and stress; and freedom to express natural behavior. The United States Department of the Interior (USDI) Fish and Wildlife Service has issued standard guidelines for handling sea turtles in captivity. This study aimed to evaluate sea turtle conservation efforts through ex-situ strategies by fostering populations in controlled environments. The research was conducted at the sea turtle captive facility on Nipah Beach, Malaka Village, North Lombok District, West Nusa Tenggara, Indonesia, which consists of five rearing ponds and associated facilities where at the time of the research there were 566 individual sea turtles of three species: the olive ridley turtle (Lepidochelys olivacea), hawksbill turtle (Eretmochelys imbricata), and green turtle (Chelonia mydas). Sea turtle handling in captivity was assessed using a scoring method, complemented by observation, measurement, interviews, and laboratory analysis, based on a modified version of the 2019 Captive Sea Turtle Standards issued by the USDI Fish and Wildlife Service, and the key aspects and optimization steps of the captivity were analyzed using Analytic Hierarchy Process (AHP). In conclusion, the management of captive sea turtles achieved an overall score of 369 out of 459 (80.39%), indicating very good conditions. Pond management constitutes the primary determinant in sea turtle captivity, with a value of 0.3049. The priority order of management actions required to optimize sea turtle captivity practices from highest to lowest are: providing pond shading, conducting daily health inspections, regulating pond lighting in accordance with natural daylight cycles, constructing pond edges, and equipping pond lights with covers. Another thing to note is to ensure that there is no overcrowding in the pond. The absence of nationally recognized welfare standards in Indonesia highlights the need for policymakers to establish comprehensive guidelines for sea turtle captivity to ensure consistent and sustainable management practices.