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利用英国巴廷敦(Bartington)MS2型双频率感应磁化率仪测定分析了海河低平原盐渍区4个剖面土壤磁学性质。结果表明,该区土壤具有明显的磁化率空间分布差异,盐渍涝洼地段磁化率低(<34×10~(-8)m~3/kg),已脱盐地段磁化率高(>50×10~(-8)m~3/kg);同一剖面表土层较底土层土壤磁化率高。位于剖面中下部的河湖沉积胶泥层磁化率高,且频率依赖性系数甚高,指示粘层存在粒径<0.01μm左右的超顺磁铁磁态矿物。土壤磁化率测量适用于冲积性平原土壤磁学性质空间分布趋势的检测,亦作为土壤与生态环境演变指示特征之一。
The magnetotactic properties of four sections of salinity in the Haihe low plain were analyzed by the Bartington MS2 dual-frequency induction magnetic susceptibility analyzer. The results showed that the soil had obvious spatial distribution differences of magnetic susceptibility, the low susceptibility (<34 × 10 ~ (-8) m ~ 3 / kg) in the saline-waterlogged depressions and the high susceptibility (> 50 × 10 ~ (-8) m ~ 3 / kg). The soil magnetic susceptibility in the same profile topsoil was higher than that in the bottom soil. The lacustrine sediments located in the middle and lower part of the profile have high magnetic susceptibility and high frequency dependence coefficient, which indicates that there exists superparamagnetism magnetic minerals with particle size <0.01μm. The measurement of soil magnetic susceptibility is suitable for the detection of the spatial distribution of soil magnetic properties in alluvial plain and also as an indicator of the evolution of soil and ecological environment.