The influence of the central floodplain relief on the spatiotemporal variability of the proper-ties of alluvial drained bog soil

Based on studies conducted from 2019 to 2022, it was established that drainage reclamation of floodplain lands was accompanied by a change in the geomorphological conditions of the central part of the floodplain and the appearance of elevated areas and microdepressions, which was reflected in the spatial heterogeneity of the properties of drained alluvial soils. The paper shows the dynamics of moisture, ORP, amorphous iron and mobile phosphorus as a whole for twelve periods of 4-year studies. According to the results of variation statis-tics, it was established that the main factor of the variability of properties are differences in the hydrological conditions of the vegetation periods on elevated relief elements and in mi-crodepressions. The values of the coefficient of variation of moisture in the soils of the eleva-tions were 2 times higher than in the depressions, other properties were also characterized by high variability, especially the phosphorus content, the coefficient of variation (CV) of which was 53%. Taking into account all forms of relief, the variability of properties in gen-eral for the site increased significantly: CV moisture increased to 13.6%%; ORP to 21% (almost 2 times), iron - to 8%; mobile phosphorus - to very high (77.8%). Keywords: ALLUVIAL DRAINED SOIL, INCREASES, MICRODEPRESSIONS, MOISTURE, ORP, PHOSPHORUS, IRON, VARIABILITY