Dynamic Change Patterns of Soil Surface Roughness and Influencing Factors under Different Tillage Conditions in Typical Mollisol Areas of Northeast China

Soil surface roughness is an important factor affecting hydrology and soil erosion processes, its development influenced by precipitation, topography, tillage practices. In this study, the typical mollisol area in northeast China was taken as research object. Then, variation with time analyzed under different terrains, well methods, effect of precipitation condition on also discussed detail. Through design field experiments, height information measured using a probe-type plate. Two parameters, root-mean-square (RMSH) correlation length (CL), were selected to quantitatively characterize roughness. addition, dynamic change patterns resulting from five including rotary tillage, combined no conventional reduced both sloping flat land, compared throughout soybean growing season, influence rainfall. The results show that increase rainfall, RMSH surface, showed trend first decreasing, then increasing. RMSHs land greater than those CLs methods smaller land. degree all practices, indicating study great practical importance rational selection scientific quantification erosion, which obvious significance for water conservation.