摘要：Tillage and water erosion both play important roles in total soil erosion occurring in cultivated fields. Water erosion induced channels are often observed on sloping farmlands and these channels are mostly smoothed by tillage operations, a form of tillage erosion that is largely ignored. Due to the changes in surface morphology, it is likely that the presents of channels may affect the movement of soil by tillage. However to date no research has been conducted to quantify such effects. During this study, tracer plots were established in a harvest potato field located in Dezhou, Shandong Province, China, to examine tillage translocation under three treatments: no channel (control check) (CK), 20 cm (wide) x 20 cm (deep) channel (20^20) and 30 cm (wide) x 30 cm (deep) channel (30x30). The field was set at 15% slope gradient. Plots were tilled for upslope and downslope directions. After tillage, tracer redistribution along the path of tillage was used to generate a summation curve to quantify the movement of soil particles along the tillage path. Results showed that both up and downslope tillage operation can move vast amount of soil and are potentially erosive in all treatments. The order of soil translocation distance is CK > 20x20 > 30x30. And this effect is becoming more obvious when percentile (from 50% to 95%) increases both in downslope than upslope. The relationship between soil displacement in the up and downslope direction and slope gradient is described by a linear equation aim to eliminate the channel effect, and order of soil translocation distance is 30x30 > 20x20 > CK. Moreover, because of complexity of tillage and water erosion processes, in order to obtain the more accurate results, the method should take lateral and back translocation functions into consideration. Overall, it was concluded that the existence of channels can affect tillage erosion due to potential energy consumptions.
