施用城市生活污泥对土壤肥力长期效应的影响

利用盆栽试验,研究了一次施用不同数量城市生活污泥连续5茬种植油菜对褐土性土和石灰性褐土中有机质和速效氮、磷、钾含量的影响。结果表明,施用城市生活垃圾能够明显提高2种土壤中有机质和速效氮、磷、钾养分的含量,且随施用量增加效应的提高,其效果可持续相当长的时间。施用等量污泥对于养分相对贫瘠的褐土性土的养分提高量要大于石灰性褐土。

The Long-term Effects of Sewage Sludge to Two Types of Soil Fertility

A pot experiment applied household sewage sludge one time and continually five times planted rape was conducted to study the long-term effects of the sewage sludge to the organic matter（OM）,available N,P and K in calcic cinnamon soil and weakly developed cinnamon soil.The results indicated that applying the domestic sludge increased obviously OM,available N,P and K in the two calcareous soil and the effects increased as the applied doses of sewage sludge increased.The increases of nutrients in the nutrient-poor weakly developed cinnamon soil were greater than in the calcareous soil with equal applied quantites of sludge and garbage.