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三峡水库消落区土壤胶体对Cd在土壤中迁移的影响 预览 被引量:7

Effect of Soil Colloids on Migration of Cadmium in Soils from Water Level Fluctuating Zone of Three Gorges Reservoir
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摘要 选取三峡水库消落区典型土壤,即紫色土、黄壤、紫色潮土和灰棕潮土为研究对象,以相应土壤胶体、蒙脱石矿物的10 mg/L Cd(NO3)2淋洗液分别淋洗土柱,研究了水分散态胶体对镉在土柱中迁移的影响.添加上述胶体的镉淋洗液,在紫色土、黄壤、紫色潮土和灰棕潮土土柱中镉迁移量分别是对照的1.18~4.96,1.05~2.37,1.10~4.33,1.03~3.33倍.结果表明胶体能够促进镉离子在土层中的迁移,其迁移能力遵循紫色土胶体≥紫色潮土胶体>灰棕潮土胶体>蒙脱石胶体>黄壤胶体的规律.由此得出,胶体吸附态镉的迁移能力取决于胶体类型和土柱性质. Four kinds of typical soils such as purple soil,yellow soil,purple alluvium and grey-brown alluvium in water level fluctuating zone of the Three Gorges reservoir were used to study the effect of these soil colloids and Ca-montmorillonite on leaching of cadmium from soil columns,respectively.With the addition of the leaching solutions of cadmium mixed with the above colloids,the migration amounts of cadmium in purple soil,yellow soil,purple alluvium and grey-brown soil column were 1.18~4.96,1.05~2.37,1.10~4.33 and 1.03~3.33 times as the controls,respectively.These results indicated that these colloids can enhancethe migration of cadmium,and the migration capability of cadmium follows the order of purple soil colloid ≥ purple alluvium soil colloid > grey-brown alluvium soil colloid > Ca-montmorillonite > yellow soil colloid.Therefore, the migration capability of colloid-absorbed cadmium is dependent on colloid type and soil column properties.
作者 肖广全 温华 魏世强 XIAO Guang-quan  WEN Hua  WEI Shi-qiang 
出处 《水土保持学报》 CSCD 北大核心 2007年第4期 16-20,共5页 Journal of Soil and Water Conservation
基金 重庆市科技攻关项目"重庆市农地污染与农作物健康品质关联规律及综合控制技术研究"(016655)资助
关键词 三峡水库 消落区 镉迁移 Three Gorges reservoir water level fluctuating zone migration of cadmium
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