Organic matter in degraded agricultural soils amended with composted and thermally-dried sewage sludges
Organic matter in degraded agricultural soils amended with composted and thermally-dried sewage sludges
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DOI：
10.1016/j.scitotenv.2007.01.008
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发表时间：
2007-05-25
影响因子：
9.8
通讯作者：
Polo, Alfredo
中科院分区：
文献类型：
--
作者：
Fernandez, Jose M.;Hernandez, Diana;Polo, Alfredo
堆肥和热干燥的污水污泥（CSS和TSS，分别）对土壤有机质及其腐殖化分数的累积和残留效应进行了评价在地中海条件下的田间试验。实验设计包括未改良（对照）或用矿物肥料、CSS和TSS改良的土壤地块，施用率为20和80 t ha（-1）。在施用污泥的第一年后，每个小区被分成两个子小区。在一个子区组中，在接下来的3年中没有额外应用SS，并评价了首次应用的残留效应。在第二子区组中，污泥改良剂的累积效果进行了评估，应用CSS和TSS也在接下来的连续三年。9个月后，每年的污泥和矿物肥料的应用程序，从控制和改良土壤表层土壤样品收集和分析总有机碳（TOC），总提取C（TEC），和腐殖化C馏分，腐殖酸C（HAC）和富里酸C（FAC）馏分。与对照和矿物处理，这表明类似的结果相比，反复应用到土壤的TSS，特别是CSS，诱导增加的有机组分的含量检查，以及HA百分比（%HA=HAC/TOC）和聚合度（DP=HAC/FAC）。在残留实验中，随着改良时间的延长，经CSS和TSS改良一次的土壤的TOC、TEC、HAC和FAC含量略有下降，而%HA和DP则呈增加趋势。此外，三年后的污泥应用程序，相对于对照土壤，与CSS修改一次的土壤表现出类似的TOC，TEC，和FAC含量，和稍大的HAC含量，%HA和DP;而那些修改一次TSS，功能仍然更大的TOC，TEC，HAC含量，类似的FAC含量，和稍大的%HA和DP值。作为一个整体，所获得的结果表明，这两种污泥有助于改善土壤有机质水平和腐殖化组分，虽然CSS的贡献可以被认为是一个更有效的有机修正比TSS，这可能会出现的问题的成熟度和降解性。(C)2007 Elsevier B. V.保留所有权利。
The cumulative and residual effects of composted and thermally-dried sewage sludge (CSS and TSS, respectively) on soil organic matter and its humified fraction were evaluated in a field experiment under Mediterranean conditions. The experimental design included soil plots either unamended (control) or amended with mineral fertilizer, CSS and TSS at rates of 20 and 80 t ha(-1). After the first year of sewage sludge application, each plot was divided into two subplots. In one subplot group, no additional application of SS was made in the following 3 years, and the residual effect of the first applications was evaluated. In the second subplot group, the cumulative effect of sludge amendments was evaluated by applying CSS and TSS also in the following three consecutive years. Nine months after the yearly sludge and mineral fertilizer applications, surface soil samples from control and amended soils were collected and analyzed for total organic C (TOC), total extractable C (TEC), and humified C fractions, both humic acid C (HAC) and fulvic acid C (FAC) fractions. Compared with the control and mineral treatments, which showed similar results, the repeated application to soil of TSS, and specially CSS, induced an increase on the content of the organic fractions examined, as well as HA percentage (%HA=HAC/TOC) and degree of polymerisation (DP=HAC/FAC). In the residual experiment, the TOC, TEC, HAC and FAC content of soils amended once with CSS and TSS decreased slightly when increasing the time from the amendment, whereas the %HA and DP tended to increase. Further, three years after the sludge applications, with respect to the control soil, the soils amended once with CSS exhibited similar TOC, TEC, and FAC content, and slightly larger HAC content, %HA and DP; whereas those amended once with TSS, featured still larger TOC, TEC, HAC content, similar FAC content, and slightly larger %HA and DP values. As a whole, the results obtained suggested that both kind of sludges contribute to improved soil organic matter levels and humified fractions, although the CSS contribution can be considered as a more efficient organic amendment than the TSS, which may present problems of maturity and degradability. (C) 2007 Elsevier B.V. All rights reserved.