The study looked at how different levels of moisture in forest soils affect the amount and type of organic matter present. Researchers studied soil samples from various areas in Central Poland and found that soil moisture plays a key role in carbon accumulation. Soils with higher moisture levels had more organic carbon, especially in swampy areas. The distribution of carbon in different soil layers also varied depending on moisture levels, with higher moisture leading to a decrease in the ratio of humic to fulvic acids. This suggests that carbon is more mobile in wetter soils. Overall, the findings highlight the importance of moisture in shaping the quality and quantity of organic matter in forest soils.