徐州市某水泥厂附近土壤中黑碳和有机质的磁学响应

MAGNETIC PROXY OF BLACK CARBON AND ORGANIC MATTER IN SOILS ADJACENT TO A CEMENT PLANT,XUZHOU( CHINA)

以徐州某水泥厂附近土壤样品为例,分析了土壤中黑碳(BC)和有机质(OM)的含量,并研究了不同利用类型土壤中黑碳和有机质的磁学响应。结果表明,研究区域黑碳含量和有机质含量的平均值分别为12.35 g/kg和112.33 g/kg。林地样品的黑碳和有机质含量均与频率磁化率正相关,耕地样品的黑碳含量和有机质含量均与频率磁化率负相关,说明不同类型土壤中黑碳和有机质的来源不同,且人为活动对土壤理化性质影响较大。不同利用方式土壤的黑碳含量与磁化率(χ)、非磁滞剩磁磁化率(χARM)、软剩磁(SOFT)、饱和等温剩磁(SIRM)显著正相关;有机质含量和χ,SOFT,SIRM正相关,初步判断这些参数可以作为黑碳或有机质的代用指标。

Soil samples were collected from a cement plant in the city of Xuzhou（ Jiangsu Province,China）,and the soils black carbon（ BC） and organic matter（ OM） are analyzed in this study. The results show the mean BC and OM in soils are 12. 35 g/kg and 112. 33 g/kg,respectively. The forest soil BC and OM contents have both significantly positive correlations with frequency magnetic susceptibility（ χfd）（ p 〈0. 001）,whereas the farmland soil BC and OM contents exhibit both significantly negative correlations with frequency magnetic susceptibility（ p 〈0. 001）. The findings indicate the soils BC and OM are quite different in different soil types,and human activities greatly influence on the soils chemical properties. The BC contents in various soil types consistently have significantly positive correlations with magnetic susceptibility（ χ）, the susceptibility of anhysteretic remanent magnetization（ χARM）,saturation isothermal remanent magnetization（ SIRM） and soft isothermal remanent magnetization（ SOFT）. The soils OMs have significantly positive correlations with χ,SIRM,and SOFT. This study suggests that these magnetic parameters（ χ,SIRM,and SOFT） can be used in soil analysis instead of BC and OM contents.