城市污泥及其堆肥对草甸灰化壤的影响

Effects of Municipal Sludge and Its Compost on Agricultural and Chemical Characteristics of Meadow Podzol Soil

研究了城市污泥堆肥对草甸灰化壤性质的影响。第一组试验中,在作用时效方面,施入城市污泥及其堆肥的土壤,耕层中水解性酸分别降低了5.4%和8.5%,可吸收阳离子总量增加8.5%和7.5%,速效磷含量增加2.93和3.82倍。在作用后效方面,有机堆肥与对照相比,速效磷含量增加了4.46倍。对于城市污泥处理的土壤,速效磷含量只增加2.5倍。第二组试验中,有机堆肥处理,钾含量分别增加39%和50%,土壤石灰处理导致土壤中交换性钾含量分别下降2%和3%。在作用后效方面,与石灰配合施用的处理,土壤交换性钾含量增加52%-86%。对于两组实验,城市污泥和堆肥处理,导致土壤耕层中的重金属总量和有效态含量与对照相比有明显增加。施用城市污泥及其堆肥的不同处理土壤表现为轻度污染。

The effects of organic compost mainly produced from municipal sewage sludge on the agricultural and chemical characteristics of soil were studied. In the first group of experiment, soluble acid in the soil declined 5.4% and 8.5% after being applied with the sludge and organic compost on the time effect. Meanwhile, the total absorbable ions in- creased 8.5% and 7.5% and the contents of available phosphorus increased 2.93 and 3.82 times as the control correspond- ingly. On the after effects, the contents of available phosphorus in the cultivated layer increased 4.46 times in compost as that in the control, but it only increased 2.5 times in the sewage sludge treated soil. In the second group experiment, the contents of K increased 39% and 50% in the compost and the contents of exchangeable K decreased 2% to 3% after the lime treatment. While the content of exchangeable potassim increased 52%-86% after applying with the lime. Comparing to the control, the total heavy metal content and absorbable metals increased obviously in municipal sludge or compose treated soil. The soil applied with different content of municipal sludge and compost showed light pollution.