改变镉生物有效性对植物吸收积累镉的影响

土壤镉的生物有效性受土壤成分和土壤环境条件的影响，有机质、pH、氧化还原电位等的变化都会影响土壤中镉由有机结合态和残渣态一不能被植物吸收积累的镉形态向可交换态、碳酸盐态、铁锰氧化态一容易被植物吸收利用的形态转化．一些土壤改良剂、有机物料、营养元素以及微生物都可以改变土壤镉的有效性，进一步影响植物积累镉的量，对植物生长及品质造成影响．由于有效态镉直接影响植物对镉的吸收积累，寻找有利途径以减少土壤有效态从而降低植物对镉的吸收显得非常关键．

IMPACT OF AITERING CADMIUM BIOAVAILABILITY IN SOIL ON CADMIUM ACCUMULATION IN PLANT

The bioavailability of soil cadmium is affected by many parameters including soil composition, environmental conditions. Organic matter, pH and redox potential will affect soil cadmium transfer from cadmium form bound to organic matter and residual, which can not be absorbed and accumulated by plants into exchangeable, carbonate bound, Fe -Mn oxidation state easily absorbed by plants. Soil condition, organic mater, Micro and macro nutrients and microorganisms can alter the richness of soil cadmium, and further impact on accumulation of cadmium of plant and plant growth and development. The effect of cadmium directly influences the uptake and accumulation of cadmium. To find out the favorable route in order to reduce the soil available cadmium and plant cadmium uptake is very important.