有机物质对土壤镉有效性的影响研究综述  

A Review for Effect of Organic Substances on the Availability of Cadmium in Soils

作　　者：余贵芬[1] 蒋新[1] 孙磊[1] 王芳[1] 卞永荣[1] 

机构地区：[1]中国科学院南京土壤研究所,南京210008

出　　处：《生态学报》2002年第5期770-776,共7页Acta Ecologica Sinica

基　　金：国家重点基础研究发展规划资助项目 ( G1 9990 1 1 80 1 -3)

摘　　要：土壤中的低分子有机酸和腐殖酸对镉的有效性有重要作用。根系分泌的低分子量有机酸能提高土壤镉的可提取率、移动性和生物有效性 ,但是更大分子量的有机酸 EDTA却抑制植物对镉的吸收。腐殖酸促进土壤镉的溶解性 ;因腐殖酸组分和环境条件 ,腐殖酸能够促进也能抑制土壤镉活性 ,因此有必要深入研究影响腐殖酸固定镉的因素 ,以达到利用有机质抑制土壤镉活性的目的。Low-molecular-weight organic acids (LMWOAs) and humic acids have great effects on the availability of cadmium in the soils. LMWOAs, which was excreted by the plant roots, can increase the extractability, transportation and bio-availability of soil cadmium while the organic acids with higher molecular weight such as EDTA prohibits its adsorption by plant. Humic acids promote the solubility of soil cadmium. Depending on the different fractions of humic acids and environmental factors, humic acids can increase or decrease the availability of cadmium. Therefore, it is necessary to study further the factors which immobilize the soil cadmium so as to prevent soil cadmium activity through organic matter.

关 键 词：有机物质 土壤镉有效性 影响 综述 低分子有机酸 

分 类 号：X131.3[环境科学与工程—环境科学]