镉污染农田土壤修复技术研究进展

Research Progress on Remediation Technology of Cadmium-contaminated Agricultural Soils

镉是农田土壤污染最为广泛和农产品超标最为突出的重金属元素,对镉污染农田土壤的修复一直是重金属污染治理的重点和难点。近年来,国内外就镉污染农田土壤的修复技术进行了大量的研究和广泛的探索,尝试了各类钝化剂及农业措施等在减控农产品镉积累的效果,提出了诸如推行低吸收作物品种、工程措施、化学修复、生物修复和农艺调控等技术。该文分析了镉污染农田土壤修复中各类技术的应用效果、作用机理及其限制因素,认为分类治理和推行联合修复技术是今后我国镉污染农田土壤修复技术发展的方向。

Cadmium is one of heavy metals most widely found in the polluted agricultural soils and agricultural products in China.Remediation of cadmium contaminated farmland soils is always the key and difficult point in the treat- ment of heavy metal pollution of China.In recent years, a great deal of research and exploration on the remediation technologies of cadmium contaminated farmland soils have been done at both home and abroad, and the effects of var- ious kinds of passivation agent and agricultural measures on reducing cadmium accumulation in agricultural products were studied.Several measures, such as the implementation of low absorption crop varieties, engineering mea- sures, chemical remediation, bioremediation and agronomic regulation, had been put forward.In this paper, the appli- cation effects, mechanism and limiting factors of various techniques in remediation of cadmium contaminated soil were reviewed.It is suggested that the classification management and the implementation of joint remediation technol- ogies are the future development of the remediation of cadmium contaminated farmland soils in China.