The aim of the study was to assess the correlation between the content of C, N, P and the C:N and C:P ratios in the soils of the Białowieża Primeval Forest reserves in north-eastern Poland. The research was carried out in forest reserves in the Lipiny, Dębowy Grąd, Władysława Szafera and Koryciny reserves in the Białowieża Primeval Forest (north-eastern Poland). Soil samples were collected in the fall of 2021 from the layers: 0 (litter), 0-5, 5-10, 10-20, 20-40 cm, and after drying and preparation, the pH was measured in 0.01 mol CaCl₂·dm^-3 and the content of N_Tot and P_Tot. Soils were acidic (pH_CaCl2: 4.32-5.00) and the average nutrient contents were in the range: for C (68.4 - 110.0 g·kg^-1 in DM); N (2.95-3.45 g·kg^-1 in DM); P (0.187-0.516 g·kg^-1 in DM). Significant positive linear Pearson correlations (p = 0.00001) were obtained for C_Tot x N_Tot (R = 0.916); C_Tot x P_Tot (R = 0.666); N_Tot x P_Tot (R = 0.665) for all objects. The stoichiometric ratios had a wide range for C: N (10.71-52.70) and C: P (4.78-1445.0). Their highest values ​​were recorded in the litter ("0") and in the layer 0-5 cm deep. A significant value of C:N>20 and C:P>300 may indicate the accumulation of soil organic matter "carbon sequestration" and an increase in biological phosphorus sorption.