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机构地区:[1]山西师范大学城市与环境科学学院,山西临汾041000
出 处:《安徽农业科学》2011年第9期5319-5321,5353,共4页Journal of Anhui Agricultural Sciences
基 金:山西省软科学研究计划项目(2008041032-03)
摘 要:[目的]研究临汾盆地褐土剖面磁化率与粒度垂直变化特征及相关性。[方法]在临汾市尧都区农田取120 cm深的土壤剖面,每5 cm连续采样,对所取的24个土样进行磁化率和粒度的分析。[结果]磁化率随土壤深度增加而递减,>50μm粒级含量随着土壤深度的增加而递减,10~50、1~10、<1μm粒级含量随着土壤深度的增加而递增。地表以下0~30 cm为砂土,30~120 cm为粉土。磁化率与1~10、<1μm粒级含量均呈极显著负相关,与>50μm粒级含量呈极显著正相关,与10~50μm粒级含量不相关。频率依赖系数XFD1.0与>50μm粒级含量呈负相关,与10~50、1~10、<1μm的粒级含量呈正相关;XFD0.1与10~50μm粒级含量呈极显著负相关,与>50μm粒级含量呈显著负相关。[结论]磁性颗粒主要赋存于粗颗粒物质中;磁化率及粒度对沉积环境和古气候的变化有一定的响应。[Objective]The aim was to study vertical variation characteristics of magnetic susceptibility and grain grade of brown soil profile in Linfen Basin and their correlation.[Method]Soil profile with the depth of 120 cm from Yaodu farmland of Linfen was sampled,then,successive sampling was carried out for each 5 cm,finally,the analysis on magnetic susceptibility and grain grade of 24 obtained soil samples were carried out.[Result]Magnetic susceptibility negatively correlated with the increase of soil depth,the content of 50 μm grain size negatively correlated with the increase of soil depth,the content of 10-50,1-10 and 1 μm grain size positively correlated with the increase of soil depth.The soil texture under the surface 0-30 cm was sandy soil,under the surface 30-120 cm was floury soil.Magnetic susceptibility and the content of 50 μm grain size were extremely significant positive correlation,and had a significant negative correlation with the content of 1-10 and 1 μm grain size.Magnetic susceptibility and the content of 10-50 μm grain size were relevant.Frequency dependent susceptibility XFD 1.0 and the content of 50 μm grain size were negative correlation,and had a positive correlation with the content of 10-50,1-10 and 1 μm grain size.Frequency dependent susceptibility XFD 0.1 was extremely significant negative correlation with the content of 10-50 μm grain size and significant negative correlation with the content of 50 μm grain size.[Conclusion]Magnetic particles were mainly occurred in coarse-grained materials;magnetic susceptibility and grain size had certain response to the variation of depositional environment and paleoclimate.
分 类 号:X131.3[环境科学与工程—环境科学]
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