酸雨对紫色土中镉、锌形态及植物有效性的影响  

Influence of Simulated Acid Rain on Chemical form and Phytoavailability of Cd and Zn in Purple Soil

作　　者：黄亮[1,2] 彭莉[1] 王定勇[1] 

机构地区：[1]西南大学环境与资源学院,重庆400716 [2]贵州民族学院,贵州贵阳550025

出　　处：《水土保持学报》2009年第3期61-64,共4页Journal of Soil and Water Conservation

基　　金：重庆市生态环境保护行动计划专项(2002008)

摘　　要：研究了在镉、锌单一污染及镉、锌复合污染的紫色土中,酸雨对镉、锌的形态及植物有效性的影响。结果表明,酸雨胁迫下复合镉、锌对作物的危害明显加重。酸雨胁迫不但改变了紫色土中可交换态镉、锌含量,而且使紫色土中镉、锌各形态(可交换态、碳酸盐结合态和氧化锰结合态)发生相互转化。采用通径分析也表明,酸雨使各形态对植株镉、锌累积量的贡献系数发生改变,直接影响其植物有效性。镉、锌复合处理与镉单一处理相比较,低浓度锌可促进莴笋对镉的吸收,提高了镉的植物有效性,而高浓度锌时则相反。An outdoor pot experiment was conducted to study influence of simulated acid rain on chemical form and phytoavailability of Cd and Zn in purple soils. Results show that simulated acid rain aggravated combined hazard of Cd and Zn obviously. Acid rain not only affected contents of exchangeable Cd and Zn in purple soil, but also facilitated transformation of the elements from one form to others （exchangeable, earbonate-bonded and Fe--Mn oxide-bonded）. The path analysis indicated that it also altered contribution coefficients of different forms of Cd and Zn to contents of Cd and Zn in the lettuce, thus directly affecting phytoavailability of the elements. Comparison of Cd--Zn combined treatment with single Cd treatment, low concentration of Zn stimulated lettuce uptake of Cd and hence improved Cd phytoavailability in the purple soil, while, Zn, high in concentration had a reverse effect.

关 键 词：酸雨 镉 锌 植物有效性 

分 类 号：X517[环境科学与工程—环境工程] X53