广东韶关市农业土壤磁学性质的空间分布及其影响因素  

Spatial Distribution and Influencing Factors of Magnetic Properties of Agricultural Soil in Shaoguan, Guangdong

作　　者：卞勇[1,2] 欧阳婷萍[1] 万洪富[3] 匡耀求[1] 黄宁生[1] 

机构地区：[1]中国科学院广州地球化学研究所边缘海地质重点实验室,广州510640 [2]中国科学院大学,北京100049 [3]广东省生态环境与土壤研究所,广州510650

出　　处：《热带地理》2014年第3期327-336,共10页Tropical Geography

基　　金：国家自然科学基金委员会-广东联合基金项目(U1201131);广东省中国科学院全面战略合作项目(2012B090400045);广东省科技计划项目(2011B030500031)

摘　　要：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。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 t

关 键 词：农业土壤 磁学性质 对应分析 韶关市 

分 类 号：S153[农业科学—土壤学]