The Diversity of Undergrowth Species on Revegetation Land of Post Coalmines at PT. Khotai Makmur Insan Abadi (PT. KMIA) in Separi Village, Tenggarong Seberang District, Kutai Kartanegara Regency

This study was motivated by the importance of the presence of a species on revegetated land of former coal mines to help the success of reclamation. Coal mining activities have caused significant environmental degradation, affecting ecosystem structure and biodiversity in revegetated land. This study aims to determine the types of undergrowth species that are present on revegetated land of former coal mines at PT. Khotai Makmur Insan Abadi (PT. KMIA) in Separi Village, Tenggarong Seberang District, Kutai Kartanegara Regency. The expected results of this study are to provide information on the number and types of undergrowth species present on revegetated land of former coal mines. This study was conducted by identifying the undergrowth species present in revegetated land, as well as analyzing vegetation diversity and environmental stability. Field data collection was carried out on plots with a size of 20m x 20m, as many as 4 pieces with a distance of 5 m per plot. to identify and count the types of lower plants present in the research plot using the PlanNet application. The PlanNet application is an application used to identify a plant species, by taking pictures of plants. Data analysis was done quantitatively and qualitatively descriptive. Quantitative analysis was conducted to explain the diversity and structure of plant vegetation. The parameters used in quantitative analysis are Relative Density (RD), Relative Frequency (RF), Important Value Index (INP), and species diversity index (H'). Based on the results of research and data processing that has been done, it can be concluded that: there are 13 species of lower plants found in the research plot, with a total of 2,232 individuals of lower plants. 13 species of lower plants include: Asystasia gangetica as many as 1. 073 individuals, Eupatorium inulifolium 260 individuals, Imperata cylindrica 41 individuals, Melastoma malabathricum L 447 individuals, Sceleria puspurascens 373 individuals, Mimosa pudica 31 individuals, Lycopodiella cernua 133 individuals, Nephrolepis biserrata 17 individuals, Dicranopteris linearis 177 individuals, Clidemia hirta 11 individuals, Saccharum spontaneum 44 individuals, Ottochloa nodosa 620 individuals, and Merremia peltata 5 individuals. Lower plants that have the highest Index of Important Value (NIP) of the 13 species found are Asystasia gangetica which is 50.59% which is included in the high category, and a diversity index value of 0.99, this indicates that the diversity of species is low and the vegetation community with environmental conditions is less stable. Based on the results of the research that has been carried out, it is recommended to conduct further research to investigate the relationship between environmental factors and the success of pioneer plant regeneration, and to carry out ecosystem restoration practices to increase the diversity of undergrowth species on revegetated land.