污泥堆肥对园林植物生长及重金属积累的影响

采用盆栽土培试验的方法,研究了污泥堆肥土地利用对高羊茅(Festuca arundinacea Schreb)和万寿菊(Tagetes erecta)生长及重金属积累特性的影响.结果表明,施用污泥堆肥可显著提高土壤中Zn,Cu和Pb重金属的含量,高羊芧和万寿菊在污泥堆肥施用比例分别为0～10%和0～5%时,植物生物量、株高及总氮、总磷的吸收均随污泥堆肥施用比例的增加而增加,2种植物对Zn均表现出比Cu更强的富集能力,其次是Cr,Ni,而对Cd,Pb的富集能力最低,就不同植物对同种重金属吸收而言,高羊茅对Zn,Cu,Cr和Ni的富集能力显著高于万寿菊,综合分析认为,高羊茅和万寿菊在污泥堆肥施用比例分别为10%和5%时,对污泥混配土壤中的重金属尤其是Zn和Cu的去除效果最佳.

Effects of Sewage Sludge Compost on Growth and Heavy Metal Accumulation in Horticultural Plants

An investigation was made of the effects of land utilization of sewage sludge compost on growth and heavy metal accumulation in tall fescue (Festuca arundinacea Schreb) and marigold (Tagetes erecta) in the pot scale experiments.The results show that sewage sludge compost significantly increases the level of Zn,Cu,Pb in the soil.The plant biomass,height,absorption of total nitrogen and phosphorus increase gradually with sludge compost application ratios of 0~10% in Festuca arundinacea Schreb or 0~5% ratios in Tagetes erecta.The enrichment of heavy metals in both plants decrease in an order: Zn>Cu>Cr,Ni>Cd,Pb.And Zn,Cu,Cr,Ni enrich more significantly in Festuca arundinacea Schreb than Tagetes erecta.In a word,the highest elimination of heavy metals in mixed soils,especially for Zn and Cu,is obtained at 10% or 5% sludge compost ratio for Festuca arundinacea Schreb or Tagetes erecta,respectively.