Effects of the application of heated sewage sludge on soil nutrient supply to plants
Effects of the application of heated sewage sludge on soil nutrient supply to plants
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DOI：
10.1111/j.1747-0765.2006.00062.x
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发表时间：
2006-08
影响因子：
2
通讯作者：
N. Moritsuka;K. Matsuoka;S. Matsumoto;T. Masunaga;K. Matsui;T. Wakatsuki
中科院分区：
文献类型：
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作者：
N. Moritsuka;K. Matsuoka;S. Matsumoto;T. Masunaga;K. Matsui;T. Wakatsuki
摘要我们以前报道过，加热污水污泥显着改变氮矿化率。本研究旨在探讨这些变化在何种程度上影响植物生长和养分供应后，应用到不同的土壤。盆栽试验中，小松菜属植物（Brassica campestris L。变种在潮土或风沙土中生长的芜菁（rapa）表明，通过在120°C下加热风干的污泥，植物吸收的N的量显著增加，并且通过在180°C下加热显著降低。在120°C或180°C下加热干燥污泥也显著增加了氮的吸收。这些植物反应可以通过污泥中无机氮释放的热诱导变化来解释。相反，N，污泥材料含有铁作为混凝剂固定土壤可溶性P。当污泥被施加到一个土壤，对植物生长的N供应的影响被抵消的P吸附到污泥和土壤。在没有额外污泥施用的情况下进行的连续盆栽实验中，进一步表明需要频繁施用污泥以维持植物生长。但是，这也会导致污泥组分在土壤中的积累，因为污泥中的N和P在植物的两次收获中分别只有不到40%和15%的回收率。总之，加热污泥材料可以作为一种有效的有机氮肥，只要它们被施加到一个合适的土壤和土壤生产力的短期影响与环境质量的长期影响是平衡的。
Abstract We previously reported that heating sewage sludge significantly changes the rate of N mineralization. The present study was undertaken to examine the extent to which these changes affect plant growth and nutrient supply after application to different soils. A pot experiment in which komatsuna plants (Brassica campestris L. var. rapa) were grown in a Fluvisol or an Arenosol indicated that the amount of N taken up by the plants increased significantly by heating air-dried sludge at 120°C and decreased significantly by heating at 180°C. Heat-drying of the sludge at 120°C or 180°C also increased the N uptake significantly. These plant responses could be explained by the heat-induced changes in the release of inorganic N from the sludge. In contrast to N, the sludge materials containing Fe as a coagulant immobilized soil soluble P. When the sludge was applied to an Andosol, the N-supplying effects on plant growth were offset by P adsorption onto the sludge and soil. In a successive pot experiment conducted without additional sludge application, it was further suggested that frequent sludge application is required to maintain plant growth. However, it will also lead to the accumulation of sludge components in the soil because less than 40% and 15% of the sludge N and P, respectively, were apparently recovered in two harvests of the plants. In conclusion, heated sludge materials can act as an effective organic N fertilizer provided that they are applied to a suitable soil and that the short-term effects on soil productivity are balanced with the long-term effects on environmental quality.