施用污泥对黑麦草草坪绿地土壤理化性质和重金属元素含量的影响

Effects of applying sewage sludge on soil physico-chemical characters and content of heavy metal elements in Lolium perenne lawn

将兰州市七里河污水处理厂生活污泥施用于黑麦草草坪绿地,探讨其对土壤环境的影响。结果表明,施用0.5～8.0kg/m2污泥,改善了土壤理化性质,随着污泥施用量的增加土壤中全氮、速效氮、全磷、速效磷和有机质含量增加,土壤容重下降。施用4.0～8.0kg/m2污泥增加了0～20cm土层中Fe、Cu、Zn的含量,Ni、Pb、Cr、As和Hg与对照无显著差异,各重金属元素未向土壤下层迁移,没有对土壤造成污染。

Sewage sludge from Qilihe Sewage Treatment Factory,Lanzhou, China, were applied to lawn sown by Lolium perenne  and effects on the soil environment were measured by using different quantity of sewage sludge in comparison with chemical fertilizer. The results showed that the physical and chemical characters of the soil were improved while the application quantity of sewage sludge was in the range of 0.5~8.0 kg/m2, the contents of total and available N, total and available P, organic matter were increased, bulk density was decreased. While the application quantity of sewage sludge was in the range of 4.0~8.0 kg/m2, the contents of Fe, Cu and Zn were increased, and the contents of Ni, Pb, Cr, As and Hg in soil of 0~20 cm depth had no significant difference compared with that of the control treatment. Heavy metal elements did not move down to the deep layer of soil and cause pollution on the soil.