This study aims to determine the composition and structure of vegetation and estimate the potential for carbon dioxide absorption in the Tangale Nature Reserve Area, Gorontalo Regency. The method used in this study is the determination of sampling locations carried out by purposive sampling, making multilevel plots, analyzing vegetation structure, and estimating tree biomass is done non-destructively based on measuring the height and diameter of trees at breast height (DBH), while for lower plants it is done destructively and litter is taken all in the plot area to be weighed wet and dry weight and then estimating biomass, C reserves, and CO2 uptake. The results showed that the vegetation composition consisted of 18 species dominated by the Magnoliopsida class. The highest Important Value Index is found at each observation station. Calculation of biomass value, C reserves, and CO2 uptake at each observation station showed varying results because they were influenced by vegetation type, vegetation density, vegetation composition and structure, and environmental factors. The total value of CO2 uptake by vegetation in the Tangale Nature Reserve Area is 5,304.393 tons of CO2/ha. This research provides a better understanding of carbon sequestration potential in conservation areas to support environmental conservation and climate change mitigation efforts.
 

Seed dormancy is one of the main factors that inhibit the process of germination and plant growth. This study aims to study the effectiveness of using gibberellic acid (GA3) in maintaining the dormancy of rice seeds (Oryza sativa L.) Mekongga variety to increase germination. In this study, Mekongga rice seeds that experienced dormancy were given GA3 treatment with various concentrations. 0.25 ppm, 0.50 ppm, and 0.75 ppm with 24- and 48-hour immersion. The parameters measured include germination percentage, maximum growing potential, dormancy intensity, and sprout length. This research uses a quantitative approach with experimental methods. This study was carried out using a factorial pattern Group Randomized Design (RAK), which consisted of two factors, namely four levels of soaking using three differences in GA3 concentration and one control (aquades) and two levels of seed immersion, namely 24 and 48 hours. The results showed that GA3 treatment in combination concentration treatment had an influence on observation parameters, and there was the best concentration, namely a concentration of 0.25 ppm in 48-hour soaking capable of producing the highest germination of 96.25%, maximum growth potential reaching 98.5% with a dormancy intensity value of 1.5%.