施用生活污泥改良滩涂土壤理化性状的探讨

Study on the amendment of physicochemical properties of tidal flat soil by sewage sludge application

采用符合土地改良用标准的生活污泥为材料,通过田间小区随机区组试验,研究生活污泥的不同施用量(0、75、150、300、600 t/hm2)对滩涂土壤部分理化性质的影响。结果表明,施用生活污泥可显著改善滩涂土壤的理化性状。随着污泥施用量的提高,滩涂土壤的容重、密度、pH值逐渐下降,有机质、全氮、全磷、速效氮、速效磷、CEC均呈上升趋势,全钾、速效钾无显著变化。滩涂土壤的细菌、放线菌数量随污泥施用量的提高呈上升趋势。

In this study,a field experiment was carried out at a new reclaimed tidal flat to investigate the effects of different rates（0,75,150,300,600 t/ha） of sewage sludge,which was derived from disposal of municipal sewage water,on soil physicochemical properties.The quality of the sewage sludge used in the study met the national standard of sewage sludge for agricultural use.Plots in the experiment were arranged as randomized block design with 3 replicates.The results show that the sewage sludge could significantly improve physicochemical properties of the tidal flat soil.With the increase of sewage sludge application,soil bulk density,specific weight and pH are decreased,while soil organic matter,total nitrogen,total phosphorus,available nitrogen,available phosphorus and cation exchange capacity（CEC） are tended to increase,and the total potassium,available potassium are not changed significantly.The numbers of bacteria and actinomycete in the tidal flat soil treated with sewage sludge are significantly higher than those in the tidal flat soil which is naturally evolved.