Samsu Arif

The construction of the 150 kV Tentena–Kolonedale High Voltage Overhead Transmission Line (SUTT) requires clearing a Right of Way (RoW) corridor to ensure the safety and reliability of the power transmission system, an activity that can alter land cover and reduce biomass, carbon stock, and CO2...

Landslides pose a severe environmental and socioeconomic threat in mountainous regions, yet existing spatial risk assessments often isolate hazard prediction from actual land-use exposure. This study develops an integrated geospatial framework to evaluate landslide susceptibility and quantify...

This study aims to analyze flood susceptibility and evaluate the spatial exposure of settlement areas in Barru Regency, Indonesia, using a Geographic Information System (GIS) and a Random Forest approach. Environmental variables, including elevation, slope, soil type, rainfall, land cover, and...

Small islands in Indonesia still lack of spatial information on land resources to support food security related decisions. While the quality of land management decisions depends on the availability of sufficient, precise, accurate spatial information on land quality, use of a geographic information system (GIS) is crucial. The aim of this study was using a GIS to identify available land areas suitable for maize cultivation in Wakatobi Regency, Indonesia. In this study, land suitability classification was carried out based on the Framework for Land Evaluation produced by the Food and Agriculture Organization (FAO) of the United Nations. A total of 127 sampling sites within 21 land units were used for the identification of soil properties; the characteristics of these soils were then tested in the laboratory. Our analysis indicate that, land in suitability classes S2 (moderately suitable) and S3 (marginally suitable) covers a total area of 4,581 ha (44.3% of the island). However, the available areas that are also highly suitable for maize cultivation cover only 1,906.8 ha or 18.4% of the total area. The main limiting factors are the climate, especially in relation to how the amount of rainfall affects the availability of water, surface rockiness, and soil depth. The net income of farm households per hectare in the areas of suitable available land is in the range of IDR 4,844,167 to IDR 6,770,000. The results of this study can serve as guide for future land use management on this small island and help to improve local maize yields.

Land degradation has become a global environmental issue due to its impact on soil quality and the sustainability of terrestrial ecosystems. However, empirical evidence on soil quality, particularly the chemical properties of degraded soils in the Prafi Watershed, is still limited. This study aimed to analyze the chemical properties of soil in five land classes designated in the national critical land map. A total of 20 composite soil samples were collected from locations representing each degradation class and analyzed for soil chemical properties, including soil organic carbon (SOC), total nitrogen (TN), available P, soil pH, exchangeable base cations, cation exchange capacity (CEC), and base saturation (BS). Thresholds for each parameter were set based on the soil analysis, and statistical differences among classes were analyzed using one-way ANOVA followed by Tukey HSD. Base saturation, calcium, magnesium, potassium, SOC, and TN significantly differed between undegraded land and the four classes of degraded land, in which leaching and soil disturbance caused losses of organic matter and base cations. Other parameters, including Na, available P, pH, and CEC, were not significantly correlated with the degree of degradation. This is because these parameters are controlled by internal soil reactions and parent material at the study site. These results verify the key role of SOC dynamics and BS status induced by environmental effects in degraded land. Rehabilitation of degraded land can be achieved through reforestation, agroforestry, and the application of organic matter. Additional investigations should be conducted with more equitable sample sizes per land use type to discern the effects of land management.

Landfills that are not equipped with protective liners risk producing leachate that seeps into shallow aquifers, thereby reducing groundwater quality. This issue is particularly relevant in tropical regions, where communities still rely on groundwater as their main source of clean water. This...

Flood hazard management in small tropical river basins faces significant challenges owing to rapid hydrological responses and a lack of hydrometric instrumentation. This study aimed to bridge the technological gap in environmental monitoring by developing a high-precision flood hazard model...

Landslides are among the most frequent and destructive geological hazards in Indonesia, particularly in mountainous regions with steep slopes, complex geomorphology, and high rainfall. In addition to their role as natural hazards, landslides act as significant drivers of environmental disturbance...