Abstract：[Background] Soil erosion has become a global ecological and environmental problem, which is seriously threatening the survival of human beings and the sustainable development of the land. As the main eroded land, the slope farmland has become the main source of river sediment. Guizhou province is one of the most representative provinces in the mountainous and hilly areas of Southwest China. The area of sloping farmland accounts for as much as 82.90% of the total farmland area. The soil erosion of the sloping farmland in this region cannot be underestimated. Therefore, it is of great significance to clarify the soil erosion characteristics of sloping farmland for the prevention and control of regional soil and water loss.[Methods] In this study, sloping farmland formed by purple sandstone, sand shale and limestone was selected as the research object. A total of 120 soil samples were collected from plough layer and plowpan. The soil particle composition was determined by the pipette method, and the organic matter content was determined by potassium dichromate heating method. Then the EPIC model was used to calculate the soil erodibility K value. According to the change of K value, the influence of tillage disturbance on slope farmland in different lithologic regions was analyzed.[Results] 1) The soil in the purple sandstone and sand shale area is dominated by clay and loam, and the soil in the limestone area is dominated by silt clay, clay and silt clay loam. The organic matter content of the three lithological areas is shown in order of limestone>sand shale>purple sandstone. 2) There is no significant difference in the composition of the plough layer and plowpan soil in the purple sandstone area and the limestone area. The clay content of the plough layer soil in the sand shale area is significantly higher than that of the plowpan. Three lithology areas show that the organic matter content of the plough layer is significantly higher than that of the plowpan soil. 3) The K value of the slope farmland in the study area is between 0.041 and 0.059, among which the purple sandstone area is between 0.059 and 0.050, the sand shale area is between 0.058 and 0.041, and the limestone area is between 0.056 and 0.049. The plough layer is shown as follows from large to small:sand shale>purple sandstone>limestone, and the plowpan is shown in sequence from large to small:purple sandstone>sand shale>limestone. 4) Among the eight soil textures in the study area, silt loam is the most vulnerable to erosion, clay is the smallest, and among the three lithology areas, the soil erosion resistance of slope farmland formed by limestone is stronger. Soil erosion resistance of slope farmland formed by purple sandstone is weak.[Conclusions] The research results may provide basic theoretical basis for the prevention and control of regional soil and water loss, at the same time more targeted, more reasonable measures to play a role.
杨懿, 高华端, 李晓松, 王群, 罗爽. 不同岩性区耕犁扰动对坡耕地土壤可蚀性的影响——以黔中地区为例[J]. 中国水土保持科学, 2022, 20(1): 99-106.
YANG Yi, GAO Huaduan, LI Xiaosong, WANG Qun, LUO Shuang. Effects of tillage disturbance on soil erodibility in slope farmland of different lithology regions: A case study of central Guizhou. SSWC, 2022, 20(1): 99-106.
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2022, Vol. 20 
