农村村落地表灰尘磁化率特征及环境意义——以商丘市毛堌堆镇为例

通过对商丘市毛堌堆镇若干村落地表灰尘磁化率进行测试,对比自然村落和集聚村落地表灰尘磁化率、集聚村落与城市地表灰尘磁化率,以及探究集聚村落内部地表灰尘磁化率差异,定量研究农村村落的地表灰尘磁化率特征。结果表明:灰尘磁化率(Xlf)变幅为50.12×10~(-8)~266.97×10~(-8) m~3/kg,平均值为115.51×10~(-8) m~3/kg;频率磁化率(Xfd%)变幅为0.93%~5.97%,平均值为2.73%;磁化率与频率磁化率呈负相关关系,表明地表灰尘磁化率升高主要受人为活动影响;集聚村落地表灰尘磁化率大于自然村落但小于城市;集聚村落中心地表灰尘磁化率大于外围;灰尘磁化率值与村落规模呈正相关。农村地表灰尘磁化率可以揭示各农村村落地表灰尘污染状况。

Magnetic Susceptibility of Road Dust in Villages and Its Environmental Significance: A Case Study of Maogudui Town in Shangqiu City, China

Based on measurement of magnetic susceptibility of road dust of Maogudui Town in Shangqiu City, China, this paper compared magnetic susceptibility between natural villages and central villages as well as central villages and cities, and also studied the difference inside the central villages. Results show that the magnetic susceptibility of dust samples ranges from 50.12×10^-8~266.97×10^-8 m³/kg, with a mean value of 115.51×10^-8 m³/kg; the frequency dependent magnetic susceptibility varies from 0.93% to 5.97%, with an average of 2.73%; There is negative correlation between magnetic susceptibility and frequency dependent magnetic susceptibility; The magnetic susceptibility of dust on central villages is higher than that of the natural villages, while lower than that of cities; The magnetic susceptibility of dust on the center of central villages is higher than that around the villages; There is positive correlation between the magnetic susceptibility of street dust and village scale; and the magnetic susceptibility of road dust in villages can indicate environmental pollution.