长期污灌农田土壤重金属镉污染及其空间变异分析
首发时间:2012-11-23
摘要:本研究利用地统计学研究了长期污灌条件下农田土壤镉(Cd)的污染现状及其空间变异特征。结果表明:经长期污水灌溉后,研究区农田土壤Cd平均含量达到1.441 mg kg-1,相对国家土壤环境质量二级限量标准,80%的土壤样品受到污染;其块基比达到33.58%,具有中等强度空间自相关性,除受结构因子影响外,人为施肥、污水灌溉等措施对其变异性起很大作用;整个研究区除仅有的0.31 km2农田土壤尚属清洁外,其它均有不同程度Cd污染。?????
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Farmland Soil Cd Pollution and Spatial Variation in Sewage Irrigation Area
Abstract:In a typical sewage irrigation area, 52 surface soil samples were collected to determine total cadmium (Cd) concentration. The soil Cd pollution status and its spatial variation were identified based on geostatistics. The results showed that the average content of soil Cd was 1.441 mg kg-1. Compared with the Chinese Environment Quality Standard for Soils Cd (0.6 mg kg-1), 80% of all samples were polluted. The nugget/sill ratio of soil Cd is 33.58%, which indicated soil Cd had a moderate spatial variation. In the whole study area, only 0.31 km2 of farmland soil was still clean, whereas soil of the rest area was polluted by Cd at different degree.
Keywords: Soil environment pollution Sewage irrigation Cadmium Spatial variation
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