氮肥对污泥农用后土壤中重金属活性的影响

An Effect of Nitrogenous Fertilizers on Activity of Heavy Metals in Sludge Applied Soil

讨论了土壤中重金属活性的主要影响因素及氮肥对污泥农用后土壤中重金属的吸附—解吸、根际土壤重金属化学行为及植物吸收的影响,提出了农业生产过程中缓减和降低氮肥对土壤中重金属活性影响的措施:按规定合理施用污泥或活性污肥,提倡科学合理施用氮肥,因地制宜选择氮肥,结合改良剂施肥。

Major factors affecting the activity of heavy metals, and effects of nitrogenous fertilizers on the adsorption and desorption of heavy metals in soil for disposing sludge, as well as the chemical behaviours of heavy metals in rhizosphere soil and plant absorption were discussed. Several measures for agricultural practices to alleviate and lower the effect of nitrogenous fertilisers on activating heavy metals were emphasised. Sludge or activated sludge fertilisers should be applied rationally by following the prescription. Rational application of nitrogenous fertilisers would be encouraged, locally suitable ones should be chosen, and ameliorant could be made in use whilst applying fertilisers.