Jurnal Sains Teknologi dan Lingkungan (JSTL)
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Spatial Distribution and Utilization of Marine Habitats by Green Turtle (Chelonia mydas) and Hawksbill Turtle (Eretmochelys imbricata) in the Gili Matra Island Marine Protected Area
Full text linkSea turtles are one of the key biota in coastal and marine ecosystems whose existence is not only ecologically important, but also holds social, cultural, and economic value. Indonesia, as the largest archipelagic country in the world, is home to six of the world’s seven sea turtle species, making it a globally significant habitat for the sea turtle life cycle. The Gili Matra Marine Protected Area, encompassing the three islands of Gili Trawangan, Gili Meno, and Gili Air, is one of the strategic regions with high potential for sea turtle conservation. This study aims to document and analyze the spatial distribution and habitat use of green turtles (Chelonia mydas) and hawksbill turtles (Eretmochelys imbricata) in the Gili Matra Marine Protected Area. Data collection was carried out during the period of September to October 2024, adjusted to weather conditions and water visibility. The method used was the Underwater Turtle Visual Census Methodology. The composition of sea turtle species and habitat characteristics were analyzed using descriptive analysis to summarize the patterns of species presence, habitat types, and environmental conditions observed during the survey. The findings indicate that the area supports both species, with sea turtles observed at various depths (9–16 meters) across multiple dive sites. The predominance of female individuals and the variation in species presence across sites suggest species specific habitat preferences and potential influences of environmental conditions. Both sea turtle was mostly observed in locations associated with coral reef structures. 
Peningkatan Kinerja Campuran Beraspal Panas dengan Penggunaan Aspal Modifikasi Zeolit
Full text linkDamage to road pavement construction before reaching its planned lifespan can be caused by asphalt being easily oxidized and vulnerable to sunlight exposure. Therefore, materials resistant to high temperatures should be used. One effort that can be done is modifying asphalt with zeolite. Zeolite contains silica, which can increase the binding strength between asphalt and aggregate and reduce the sensitivity of asphalt to temperature. The aim of this study is to analyze the characteristics of zeolite-modified asphalt with 3%, 5%, and 7% of the modified asphalt weight and its performance when applied to hot-mix asphalt. Asphalt characteristic tests include penetration tests, softening points, flash points, ductility, loss on heating, and specific gravity. Hot mix asphalt tests include the ability of the mixture to withstand loading, melting, Marshall quotient, Marshall immersion, and retained stability index. Based on the analysis, it can be concluded that the use of zeolite as an asphalt modifier increases the resistance to temperature changes of modified asphalt. The performance of hot-mix asphalt improved when using zeolite-modified asphalt compared to traditional asphalt mixtures. The recommended percentage of zeolite is 5% of the weight of modified asphalt, and the residual strength index achieved is 91.1%
Identifikasi Hubungan Antara Salinitas dan EC (Electrical Conductivity) Untuk Pengembangan Mitigasi Pengukuran Numerik-in Situ di Area Estuari: Mitigasi Kebencanaan Kualitas Air di Muara Kerandangan
Full text linkThe dynamic nature of estuarine waters necessitates new and accurate methodological approaches for determining salt content or salinity. This can be achieved through direct and real-time measurement of instantaneous and daily EC (Electrical Conductivity) levels in estuaries using EC sensors. On the other hand, similar real-time research has been limited, especially for studies of a continuous real-time nature. Therefore, this study aims to identify the relationship between EC and salinity in an estuary, using the area around the Batulayar estuary, West Lombok Regency, as a case study, employing a direct measurement model continuously for one full day. Measurements were conducted over 5 days during different lunar phases, using direct data acquisition and a numerical linearity approach via data analysis plug-ins. The identification results demonstrate a relationship between EC and salinity. At minimum values, salinity decreases as EC decreases. This reduction follows a quadratic pattern, with an obtained coefficient of determination (R²) of 0.8684 (y = 87397x² – 11173x + 2004.8). This characteristic is also supported by other measured parameters, such as TDS (Total Dissolved Solids), which exhibits a linear relationship with EC. The relationship characteristic between TDS and EC is considerably stronger, as indicated by a linear equation (R² > 0.90)
Respons Pertumbuhan Tanaman Nilam (Pogostemon cablin Benth.) Terhadap Variasi Ketersedian Air Sebagai Strategi Adaptasi Terhadap Perubahan Iklim
Full text linkatchouli (Pogostemon cablin Benth.) is an aromatic plant, well known to produce valuable essential oils. Patchouli productivity in Indonesia from 2014 to 2020 was quite fluctuated. Plant growth and productivity is influenced by climate factors and water availability. Drought for instance can disrupt photosynthetic cycle and lowering the biomass production. Patchouli plants have shallow roots, susceptible more to drought stress. This experiment was conducted to identify the effect of watering field capactiy status on growth and biomass production of Patchouli. The experiment was carried out at the Greenhouse for Research and Assessment of Agricultural Technology (IP2TP) Sidondo, Sidondo III Village, Sigi Biromaru District, Sigi Regency, Central Sulawesi, from January to March 2022. This study used Randomized Block Design (RAK) which consisted of one factor, namely diferent water levels expressed in percentage of water field capacity (KL). There were 6 differents KL treatment K0 = 100%, K1 = 90%, K2 = 80%, K3 = 70%, K4 = 60%, K5 = 50%. Each treatment was repeated 4 times with 3 plants, in total there were 72 experimental units (polybags). The results showed that 90% and 100% of water field capacity (KL) increase the growth and impact to higher patchouli biomass, 46.35 g and 47.93 g, respectively. When KL is dropped to 80%, the biomass is reduced 20%. It is therefor, to maintain higher biomass production, the water field capacity shall be kept at least 90%
Perubahan Kerapatan Vegetasi Kota Kupang Berdasarkan Citra Landsat 8 Tahun 2014-2024
Full text linkVegetation change is a key indicator for observing environmental dynamics using GIS and remote sensing approaches. Kupang City as an urban growth center in East Nusa Tenggara, is experiencing development pressures that affect the presence of natural vegetation. This study aims to map vegetation index changes and analyze their dynamics from 2014 to 2024. The method employed NDVI calculation using ArcGIS 10.8 software. The results show that high density vegetation increased from 2,124.9 ha in 2014 to 2,780.46 ha in 2024; medium-density vegetation decreased from 11,133.27 ha to 9,878.49 ha; low-density vegetation increased from 2,269.44 ha to 2,869.65 ha; and non-vegetation areas slightly decreased from 6.75 ha to 5.76 ha. The most significant change occurred in the medium-density class, with a conversion of 1,221.30 ha to low-density vegetation. These findings provide essential insights for vegetation monitoring and sustainable spatial planning in Kupang City
Karakteristik Kehilangan Energi dan Potensi Tekanan pada Jaringan Irigasi Perforasi
Full text linkThe magnitude of energy loss in a piping network significantly affects the flow rate that the network can produce. Furthermore, it is important to understand the effect of changes in energy loss and pressure due to changes in the head of the water source. This allows the characteristics of these changes and their impact on the resulting flow rate and discharge to be used as important information in irrigation network design. This test aims to determine the characteristics of the secondary energy loss and residual pressure generated by a perforated irrigation network that uses three secondary network pipes as perforations. The irrigation test was conducted at four head variations: 3.5 m, 3.6 m, 3.7 m, and 3.8 m. The energy loss analysis used the Bernoulli equation, and major and minor energy losses were analyzed at each head variation, including the amount of available water pressure utilized to flow water through the perforated pipe holes. The analysis results showed that a 1 m increase in primary pipe length resulted in an increase in network energy loss of 0.02 m, and each 0.1 m increase in head from 3.5 m resulted in an increase in total energy loss of 0.01 m. At L1 a head of 3.5 m, the pressure is 2.12 m, and at a head of 3.8 m, the pressure is 2.36 m. At L2, the pressure head ranges from 1.97 m to 2.21 m, while at L3, the pressure head ranges from 1.84 m to 2.07 m. Therefore, every 0.1 m increase in head increases the pressure head by 0.08 m in the perforated irrigation network
Karakteristik Morfologi Gabah dan Beras Padi Lokal (Oryza sativa L.) Asal Lombok, Sumbawa, Kalimantan Timur dan Kalimantan Utara
Full text linkThis study aims to determine the morphological characteristics of local rice grains and rice from Lombok, Sumbawa, East Kalimantan, and North Kalimantan. This research was conducted in May-October 2024, in lowland rice fields and laboratories. The method used was experimental method with RAK 15 treatments 3 replications. The results showed that there were 6 functional local rice varieties, including 4 local black rice varieties namely G1 (Baas Selem), G3 (Ketan Hitam Tampak Siring), G8 (Padi Hitam Kalimantan Utara), and G15 (Padi Hitam Kaltim) and 2 local red rice varieties namely G4 (Beak Ganggas) and G7 (Padi Merah Kalimantan Utara). Local rice varieties that have hair on the tip of the grain are G4 (Beak Ganggas), G6 (Padi Alas), G11 (Ambuyu Merah), dan G15 (Padi Hitam Kaltim). Local variety G4 (Beak Ganggas) showed the highest 100-grain weight of 3,98 gr, so it can be used as an elder in breeding programs to increase yield
Makrofauna Permukaan Tanah Di Bawah Satuan Pohon Campuran Alpukat, Kakao, dan Kopi Di Desa Senaru Lombok Utara
Full text linkThe presence of soil macrofauna can serve as an indicator of land quality changes, as high macrofaunal diversity generally reflects a healthier ecosystem. This study aims to assess soil macrofauna diversity in agroforestry land in Senaru Village, North Lombok, to provide an overview of soil ecosystem conditions in the area. The research was conducted in the Special Purpose Forest Area of Senaru Village on mixed tree stands of avocado, cacao, and coffee, from October to September 2023. The study employed a descriptive-quantitative method using the pitfall trap technique to collect macrofauna. Data were analyzed using Margalef’s species richness index (R), Shannon-Wiener diversity index (H’), and Pielou’s evenness index (E’). The results indicate that the soil is slightly acidic (pH 6.4), with a moderate organic carbon content (2.45%) and adequate moisture levels (57%). High soil temperature (35°C) contributes to increased organic matter decomposition, while a litter layer thickness of 6.5 cm helps maintain soil moisture. Macrofauna diversity was classified as moderate, dominated by the phylum Arthropoda, particularly the family Formicidae (134 individuals). The families Rhoppalidae (Hemiptera) and Isotomidae (Collembola) were also abundant. Species richness indices showed that coffee and cacao stands had moderate species richness, whereas avocado had lower values. Macrofauna evenness was uneven, with the highest distribution in coffee stands (47%) and the lowest in avocado (34%). These findings suggest that the agroforestry land in Senaru Village still supports soil macrofaunal diversity, with tree species variations influencing species distribution and richness
Monitoring Tetesan Cairan Infus Berbasis IoT
Full text linkThe need for proper and accurate medical equipment not limited by distance and time is to make monitoring of system. One part is that in patient care is to accurately monitor the flow of infusion fluids according to the fluid that comes out of the infusion in the right dose so that it can avoid complications that occur in patients. The creation of this system is to develop a manual observation system to be based on IoT (Internet of Things) with the advantages of remote monitoring of the flow of infusion fluids and being able to provide information in real time. The use of an internet network with a system of equipment has sensors to detect the weight of the infusion fluid, microcontrollers, and IoT communication modules connected to android.
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Evaluasi Eko-Teknis Struktur Habitat Lamun dan Kelimpahan Echinodermata di Pulau Pahawang
Full text linkSeagrass ecosystems serve as important habitats for various marine organisms, including Echinodermata. This study aims to examine the relationship between seagrass cover and the abundance of Echinodermata in the waters of Pahawang Island. Sampling was conducted at four stations using the transect–quadrat method, followed by species identification and measurements of seagrass cover. Three seagrass species were recorded: Enhalus acoroides, Thalassia hemprichii, and Halodule uninervis. Eight species of Echinodermata from four classes were found, with Diadema setosum being the most abundant and occurring at all stations. Other species appeared selectively, depending on local habitat conditions. Higher Echinodermata abundance was observed in areas with greater seagrass cover. Regression analysis revealed a positive relationship between seagrass cover and Echinodermata abundance, indicating that denser seagrass beds support higher population levels. Overall, the condition of seagrass ecosystems plays a key role in shaping the abundance and distribution of Echinodermata, highlighting the importance of conserving seagrass habitats around Pahawang Island