水土保持学报2025，Vol.39Issue(6)：66-74,84,10.DOI:10.13870/j.cnki.stbcxb.2025.06.036
紫色土坡耕地磁化率剖面分布特征及主控因素
Profile Distribution Characteristics and Main Controlling Factors of Magnetic Susceptibility in Purple Soil Slope Farmland
摘要
Abstract
[Objective]This study aims to reveal the distribution characteristics of magnetic susceptibility in profiles of purple soil slope farmland and its main influencing factors,and to explore the application value of magnetic tracing technology for the quantitative assessment of soil erosion in purple soil.[Methods]Taking purple soil slope farmland as the research object,a shovel-based soil erosion simulation method was used to establish five erosion levels at 0,5,10,15,and 20 cm and three management measures:no fertilizer(CK),chemical fertilizer alone(F),and combined application of biochar and chemical fertilizer(BF).The distribution characteristics of soil profile magnetic susceptibility under different erosion levels and management measures were investigated,and the main influencing factors of magnetic susceptibility distribution were revealed.[Results]1)The magnetic susceptibility of purple soil slope farmland decreased with profile depth.The highest value was observed in the surface layer(0～10 cm),indicating a distinct surface enhancement phenomenon.2)Soil particle size was the dominant factor influencing the magnetic susceptibility of slope farmland,with a weight of 0.424 in the minimum dataset,followed by soil available nutrients(0.367)and organic matter(0.209).Magnetic susceptibility was higher when clay and silt particles were dominant.3)The erosion level significantly reduced the magnetic susceptibility values(p<0.05),and its effect was independent of the management measures(p>0.05).Compared to S-0(erosion of 0 cm),the treatments S-5(erosion of 5 cm),S-10(erosion of 10 cm),S-15(erosion of 15 cm),and S-20(erosion of 20 cm)showed decreases in magnetic susceptibility by an average of 12.50%,13.14%,24.52%,and 35.69%,respectively.4)The magnetic susceptibility of purple soil slope farmland was dominated by fine particle content and was significantly negatively correlated with the erodibility factor(p<0.01).Erosion altered the vertical distribution characteristics of magnetic susceptibility by influencing the redistribution of materials in the soil profile.[Conclusion]The important influencing factors of the magnetic susceptibility distribution in eroded soil of purple soil slope farmland are soil particle size and erosion level.The findings of this study can provide a scientific basis for the quantitative application of magnetic tracing technology to assess dynamic changes in soil erosion.关键词
坡耕地/磁化率/剖面分布/侵蚀土壤/紫色丘陵区Key words
slope farmland/magnetic susceptibility/profile distribution/eroded soil/purple hilly region分类
农业科技引用本文复制引用
许颖,冉文建,史东梅,高家勇,江雨芙,刘方元..紫色土坡耕地磁化率剖面分布特征及主控因素[J].水土保持学报,2025,39(6):66-74,84,10.基金项目
国家自然科学基金项目(U2340215,41771310) （U2340215,41771310）
重庆市技术创新与应用发展专项面上项目(CSTB2024TIAD-GPX0043) （CSTB2024TIAD-GPX0043）
