Effects of the Duration of Wheat and Maize Straw Returning on Rill Erosion Resistance in Brown Soil in the Earth-rocky Mountainous Area of Northern China

• Published in: Shui tu bao chi xue bao Vol. 39; no. 2; pp. 74 - 81
• Main Authors: ZHANG Hanyu, LI Jiaqian, ZHAO Yajie, LI Jingjiang, LIU Zhihua, FANG Nufang, LIU Qianjin
• Format: Journal Article
• Language: Chinese
• Published: Editorial Department of Journal of Soil and Water Conservation 01.04.2025
• Subjects: critical shear stress; rill erodibility; soil physicochemical properties; straw returning duration
• ISSN: 1009-2242
• DOI: 10.13870/j.cnki.stbcxb.2025.02.002

［Objective］ Research on the effects of the duration of straw returning on rill erosion resistance can provide scientific evidence for rill erosion modeling and controlling in sloping farmland. ［Methods］ Taking straw returning durations of 0 years (CK), 3—4 years (R1), 5—6 years (R2), 7—8 years (R3), 9—10 years (R4), 15 years (R5), and 20 years (R6) as the study subjects, soil samples were collected and analyzed. Partial least squares regression analysis was applied to identify the main controlling factors of soil erosion resistance under straw returning conditions. ［Results］ 1) With the increase of straw returning duration, rill erodibility (Kd) first decreased, then increased, and decreased again. The Kd values of R2, R3, R5, and R6 were significantly lower than that of CK [170.38 cm3/(N·s)]. With the increase in the duration of straw returning, soil critical shear stress (τc) showed a trend of first increasing and then decreasing, with the pattern of R1=R3>R2>CK>R4>R6>R5, although the differences among trea