Studies on effects of application of sewage sludge on alfalfa II. Effects on physical and chemical character, element accumulation of the soil

作者：Zuo Xiu-juan · 发表于：Acta Pratacultural Science · 年份：2002 · 研究领域：Analysis of environmental and stochastic processes、Environmental Quality and Pollution

Sewage sludge collected from Qilihe Sewage Treatment Factory, Lanzhou, China, was applied to artificial grassland sown with Medicago sativa L. cv. Xingjiang Daye, and effects of sewage sludge on the soil environment were investigated. The results showed that application of sewage sludge improved the physical and chemical characters of the soil--the contents of organic matter, total N and P were increased; unit weight was decreased. While the application dosage of sewage sludge was in the range of 4~8 kg/m2, the contents of Fe, Ca, Cu and Zn were increased significantly, and the contents of K, Mn and heavy metal element of Ni, Pb, As and Hg in soils of 0~20 cm depth were no significant difference compared with that of the control. Also, the above elements had not moved into the lower layer of the soil and the application of sewage sludge did not cause the pollution of the soil environment.