摘要
为了探讨许昌市园林绿地的土壤污染状况,对许昌市园林绿地表层土壤的磁性特征进行了研究.结果表明:许昌市园林绿地表层土壤磁化率变幅为15. 24×10-8~139. 33×10-8m3·kg-1,平均值为56. 97×10-8m3·kg-1;频率磁化率的范围为1. 12%~17. 51%,平均值为7. 33%.许昌市园林绿地73. 0%的样点为土壤重金属无污染(I级),27. 0%的样点属轻度污染(II级).不同功能区园林绿地表层土壤磁化率表现为工业区>公园>居住区>交通道路>学校>农田,频率磁化率为农田>交通道路>居住区>学校>公园>工业区.土壤磁化率空间分布呈现出由郊区向市区升高的趋势,反映了人类活动强度差异对园林绿地表层土壤磁性特征的影响.
In order to study the soil pollution status of green lands in Xuchang city,the magnetic characteristics of surface soil of green lands in Xuchang city were studied. The results showed that the value of magnetic susceptibility ranged from 15. 24 × 10-8 m3·kg-1 to 139. 33 × 10-8 m3·kg-1,with the average of 56. 97 × 10-8 m3·kg-1. The range of frequency magnetic susceptibility was between 1. 12% and 17. 51%,with the average of7. 33%. The proportions of slightly polluted soils and unpolluted soils were 27. 0% and 73. 0%,respectively.The magnetic susceptibility followed the order of industrial district > park > residential district > traffic district >school > farmland. The order of frequency magnetic susceptibility was farmland > traffic district > residential district > school > park > industrial district. The spatial distribution of soil magnetic susceptibility showed an upward trend from suburbs to urban areas,reflecting the influence of human activity intensity on the magnetic characteristics of surface soil in green lands.
引文
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