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Soil organic carbon (SOC) is one of the important properties to evaluate soil quality, which can indirectly reflect the effect of afforestation on saline-alkali land. In this study, 4 different forest types in Gudao Forestry Centre were selected as experimental plots, and bare land was set as blank group. Spatial differentiation and impact factors of SOC between different forest types were studied by field investigation and laboratory experiment. The results show that (1) SOC content in the study area is lower than 1%. SOC content in forest land is higher than that in bare land. In the upper soil layer, the SOC content of  Robinia Pseudoacacia  forest is lower, and mixed forest is higher. SOC content of bare land is higher than that of forest land in the lower layer. (2) SOC has a significant positive correlation with available nutrients (P&lt;0.05), and has a weak correlation with pH and water content. There are different correlations with conductivity and bulk density in different soil layers, and they all showed a negative correlation at the upper layer, and a significant positive correlation at the lower layer (P&lt;0.05).

Study on spatial-temporal change of soil organic carbon and impact factors in Gudao Forestry Farm of Dongying