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Herbaceous plants play an important role in reducing the negative impact of erosion on the surrounding environment. Their high adaptability and solitary distribution patterns allow herbs to grow in various habitat conditions. One location that shows a fairly high diversity of herbs is in the Jaboi Hot Spring Area, Sukajaya District, Sabang City. This study focused on grouping the types of herbaceous plants in the area and assessing their diversity. Data collection was carried out using a 100-meter line transect method, which was divided into four observation stations. Each station consisted of six 2 x 2-meter square plots used for species inventory. The observation resulted in data on 22 identified herbaceous species, representing 13 families, with a total of 385 individuals. The Convolvulaceae and Fabaceae families were the most dominant groups with four species from each family. The level of species diversity was analyzed using the Shannon-Wiener index, resulting in a score of 2.82, which is classified as moderate. The findings of this study provide preliminary information on the diversity of herbaceous plants in the area, which can be used as a reference for further research and environmental management in the Jaboi Hot Spring Area, Sukajaya District, Sabang City.

Tropical forests play an important role as carbon sinks and biomass stores, including through the litter produced by vegetation. Litter contributes to nutrient cycling, maintains soil fertility, and is an important component of ecosystem carbon reserves. This study aims to estimate the biomass and carbon content of litter in the Jaboi Hot Spring Flow Area, Sukajaya District, Sabang City. The study was conducted in June 2025 using a 100 m long line transect method with four transects, each consisting of 18 1 x 1 m plots. Leaf litter samples were collected, their wet weight was measured, dried in an oven for 48 hours, and their carbon content was calculated based on the percentage of organic carbon of 0.47. The results showed a total litter biomass of 8,106 kg/m² with an average of 2,027 kg/m², and a total litter carbon of 3,809 kg/m² with an average of 0,952 kg/m². The highest values were found at Station 3 (2,354 kg/m² and 1,106 kg/m²) and the lowest at Station 1 (1,691 kg/m² and 0,795 kg/m²). Variations in values are influenced by soil physical-chemical factors, vegetation density, and climatic conditions, which influence production and decomposition rates. These results emphasize the importance of monitoring biomass and litter carbon to support forest management and conservation.