Abstract: 【Objective】The soil erosion of slope farmland in Chinese black soil region is becoming more and more serious. This study mainly focused on the interaction between transverse ridge tillage and topography on soil erodibility, which could provide a scientific theoretical basis for precise prevention of soil erosion of slope farmland in black soil region. 【Method】We selected a typical slope farmland in the Hongxing farm in Beian city of Heilongjiang Province. A total of 25 sampling points were designed along both the transverse ridge tillage direction and longitudinal waterline direction. The soil erodibility K values of the corresponding sample points were calculated and tested by One-way ANOVA method. The influence factors of soil erodibility K value were analyzed by using the geographic detector model. 【Result】In the transverse ridge tillage direction, the ridge soil erodibility decreased gradually from the top to the foot of slope and the K value decreased by 6.18%. The furrow soil erodibility decreased gradually from the shoulder to the foot of slope and the K value decreased by 5.79%. In the waterline direction, due to the blocking effect of ridge terrace on surface runoff, soil erodibility K value of ridge and furrow did not change significantly along the slope. Geodetector analysis showed that the influence of the transverse ridge tillage on soil erodibility K value was the greatest, and its interpretation rate was more than 51% and 18% in the ridge and furrow, respectively. The transverse ridge tillage and other factors had a significant interaction enhancement effects on K value, particularly the interaction between the transverse ridge tillage and topography. 【Conclusion】 The soil erodibility K value of slope farmland in the black soil region had obvious spatial variability. There was significant interaction between the transverse ridge tillage and topography on soil erodibility. The transverse ridge tillage can significantly intercept runoff and reduce soil erosion. Due to the long slope in the transverse ridge tillage, it is easy to collect runoff at the foot of the slope, and increase the potential risk of ridge failure.

Key words: soil erodibility, transverse ridge tillage, longitudinal waterline, topography, interaction, slope farmland of black soil region