辽河流域土壤镉有效性的地球化学研究

Geochemical Study on the Validity of Cadmium Element in Soil of the Liaohe River Basin

利用辽宁省辽河流域生态地球化学调查中取得的土壤镉深表层含量及形态分析等测试数据,对土壤镉的存在形态及其影响因素进行了系统对比研究,结果表明:辽河流域土壤镉主要以离子交换态、水溶态、铁锰氧化态、碳酸盐结合态、强有机结合态、腐殖酸结合态及残渣态等七种形态存在,其中离子交换态及水溶态是可被生物吸收利用的有效态,其含量主要受土壤镉全量、pH值、有机质、土壤粘度等因素制约。

Plentiful and systemic research work about existence form of cadmium in soil and its effect factors have been studied according to topsoil samples,deep-seated soil samples and modality samples obtained in zoology geochemical survey work from Liaohe River Basin of Liaoning Province. And the result indicates that main existence form of cadmium in soil from Liaohe River Basin is ion exchange form, water-soluble form, ferrimanganic oxidative form, carbonate binding form,organic binding form, humic acid binding form and residual form. Ion exchange form and water-soluble form could be absorbed and utilized by microbes, and its content depend on conditionality factors such as content of cadmium in soil, pH value, organic content and viscosity of soil etc.