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中国农学通报

中国农学通报 ›› 2012, Vol. 28 ›› Issue (23): 227-231.doi: 10.11924/j.issn.1000-6850.2012-0489

所属专题： 土壤重金属污染

• 资源 环境 生态 土壤 气象 • 上一篇    下一篇

施用生活污泥对滩涂土壤性质及重金属含量的影响

汪莉 陶天云 陈国华 赵海涛 封克 单玉华 柏彦超   

  • 收稿日期:2012-02-20 修回日期:2012-03-14 出版日期:2012-08-15 发布日期:2012-08-15
  • 基金资助:

    国家自然科学基金项目“生活污泥快速熟化滩涂土壤的机理研究”;江苏省环境材料与环境工程重点实验室开放课题“生活污泥改良滩涂土壤资源化利用处置新技术研究”

Effects of Sewage Sludge on Soil Properties and Heavy Metal Contents of Tidal Flat

  • Received:2012-02-20 Revised:2012-03-14 Online:2012-08-15 Published:2012-08-15

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摘要：

为了探讨应用生活污泥改良滩涂土壤的可行性，明确生活污泥对滩涂土壤理化性质及环境效应的影响，采用符合农用标准的城市生活污泥为材料，通过盆栽培养试验，研究了施用不同用量（0、2.5%、5%、10%、15%、20%，土壤、污泥均以干基计）的生活污泥对滩涂土壤性质及重金属含量的影响。结果表明，施用生活污泥可显著提高滩涂土壤的总氮、总磷、碱解氮、速效磷等养分含量，其中总氮、碱解氮增加的倍数很接近，速效磷增加的倍数远远高于全磷的增加倍数。施用生活污泥显著增加了滩涂土壤的有机质含量，降低了pH值，对土壤可溶性总盐含量无显著影响。施用生活污泥，增加了滩涂土壤Ni、Cd、Zn、Cu、Cr重金属的全量及有效态含量，在实际应用过程中应根据生活污泥重金属的含量确定施用量。

关键词: CTX-M基因, CTX-M基因

Abstract:

In order to study the feasibility of improving tidal flat soil with the application of sewage sludge and to understand its effects on the physic-chemical properties of tidal flat soils and the environments, pot experiments were conducted to investigate the effects of sewage sludge on soil properties and heavy metal contents of tidal flat. Municipal sewage sludge meeting the standards for agricultural use were applied at dosages of 0, 2.5%, 5%, 10%, 15%, 20% of dry soil weight. The results showed that soil total nitrogen, available nitrogen, total and available phosphors, as well as organic matter were increased significantly. Total nitrogen and available nitrogen increased at same rates, while available phosphors increased at much higher rate than total phosphors. Soil organic content increased significantly with the use of sewage sludge, while soil pH decreased. No significant effect was observed on soil soluble total salt. Total and available contents of heavy metals in tidal flat, including Ni, Cd, Zn, Cu, Cr were significantly increased. Therefore, heavy metal contents in sewage sludge should be considered as an important criteria in practical use.

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