The researchers analyzed the amount of carbon in surface soils in the Liaohe River Basin. They looked at different types of soil and landscapes to calculate how much carbon was stored in the soil. They found that the amount of carbon stored in the soil was related to the size of the area and the organic matter in the soil. Meadow and plain areas had the most carbon storage, while black hill and mountain areas had the least. Paddy soil had the highest carbon density, while sandy soil had the lowest. Mountain and hilly areas had the highest carbon density, while low mountain and hill regions had the lowest. This study helps understand how much carbon can be stored in soil in China.