This study was conducted in the Yangambi Biosphere Reserve, located in the Isangi district, 100 km west of the city of Yangambi, at 0°49′12″ N; 24°27′22″ E. To conduct this study, six one-hectare plots were established in Yangambi, within which seedlings of different height classes were measured and their x and y coordinates recorded. Each of the six plots contained a seed plant, except for plots 1 and 5. A total of 769 seedlings were recorded, averaging 128.1 stems/ha. Height class S1 had the highest number of individuals (358 stems across all six hectares, or 59.6 stems/ha) compared to the other classes, and their numbers decreased as the size of the individuals increased. The variability in the number of seedlings observed between plots confirms that there is a strong correlation (r ≈ 0.79), it is observed that plots with more seed trees generally have more seedlings; however, for dendrometric characteristics such as the diameter at breast height (DBH) of seed trees, which directly influences the abundance of seedlings under their canopy, the correlation is weak (r ≈ 0.27).