CAJ | 학술논문

环境磁学方法具有快速、经济、非破坏性等优点，在农业土壤方面具有较高的研究价值与应用潜力。选取广东省韶关市范围内的32个耕地和65个林地表层土壤样品进行环境磁学分析，测试其高、低频磁化率，非磁滞剩磁与饱和等温剩磁等磁学参数，分析农业土壤磁学性质的空间分布特征及其影响因素，以及磁学指标之间的相关性。结果表明：韶关市农业土壤磁学参数在空间上存在较大变异性，曲江、新丰和乐昌北部的磁性矿物质量分数较高，乳源、武江、始兴南部和翁源北部的磁性矿物粒度较细。土地利用方式是研究区内农业土壤磁学性质的主要影响因素，耕地的磁性颗粒粒径比林地粗，磁性矿物质量分数比林地低。母质类型对农业土壤磁学性质的影响程度不及土地利用类型，可能由于农业土壤受人为因素的影响比母质更显著。人为排放源，包括工业活动和交通运输，对农业表层土壤磁性有明显的增强效应，对磁性物质的粒径分布也有一定的影响。
배경자학방법구유쾌속、경제、비파배성등우점，재농업토양방면구유교고적연구개치여응용잠력。선취광동성소관시범위내적32개경지화65개임지표층토양양품진행배경자학분석，측시기고、저빈자화솔，비자체잉자여포화등온잉자등자학삼수，분석농업토양자학성질적공간분포특정급기영향인소，이급자학지표지간적상관성。결과표명：소관시농업토양자학삼수재공간상존재교대변이성，곡강、신봉화악창북부적자성광물질량분수교고，유원、무강、시흥남부화옹원북부적자성광물립도교세。토지이용방식시연구구내농업토양자학성질적주요영향인소，경지적자성과립립경비임지조，자성광물질량분수비임지저。모질류형대농업토양자학성질적영향정도불급토지이용류형，가능유우농업토양수인위인소적영향비모질경현저。인위배방원，포괄공업활동화교통운수，대농업표층토양자성유명현적증강효응，대자성물질적립경분포야유일정적영향。
Environmental magnetism method has advantages of rapidness, cost-effectiveness and non-destructiveness. It has great research value and application potential in the field of agricultural soil. Studies on magnetism of agricultural soil would help to extend the knowledge about its properties and develop the methodology of theoretical and applied researches on agricultural soil. However, relevant researches are limited. Shaoguan in Guangdong Province was chosen as a typical region for the research on magnetic properties in subtropical area. A set of 97 surface soil samples (32 were collected on farmland and 65 on forestland in the region) were used for magnetic measurements, including low- and high-frequency magnetic susceptibilities (χlf andχhf), anhysteretic remanent magnetization (ARM, converted to mass-specific susceptibility formχARM) and saturation isothermal remanent magnetization (SIRM). Frequency-dependent susceptibilityχfd and the ratioχARM/SIRM were also calculated from the measured magnetic parameters. Analyses of spatial distribution characteristics of magnetic parameters in agricultural soil and their influencing factors, as well as correlation between magnetic parameters, were carried out. Results showed that there existed great spatial variations of magnetic parameters in agricultural soil throughout Shaoguan. Magnetic mineral abundance related parameters, i.e.χlf,χARM, andSIRM, showed high values in Qujiang, Xinfeng and northern Lechang, while magnetic grain size related parameters, i.e.χfd andχARM/SIRM, showed high values in Ruyuan, Wujiang, southern Shixing, and northern Wengyuan, which meant finer magnetic grain size. In the studied region, land use type was the major influencing factor on magnetic properties of agricultural soil. Magnetic particles in farmland were coarser grained than in forestland, while magnetic mineral abundance in farmland was roughly lower than that in forestland. The magnetic property difference between these two land use types was attributed to the loss of magnetic minerals due to cultivation activity, and this effect was more essential on finer magnetic grains. This effect was also implied by the different bivariate correlation coefficients between farmland and forestland. Effect of parent material on magnetic properties of agricultural soil was less important than land use type, which was probably due to the more significant impacts from anthropogenic factors, such as agricultural activity. Result of multiple correspondence analysis indicated that anthropogenic emission sources, including industrial and transportation activities, may be responsible for the significant magnetic enhancement of agricultural soil in top layer, which was supported by the calculated industrial density derived from statistical data. Anthropogenic emission sources may also contribute to the magnetic grain size distribution to some extent.