Facilitation of phosphorus adsorption onto sediment by aquatic plant debris.
Facilitation of phosphorus adsorption onto sediment by aquatic plant debris.
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DOI：
10.1016/j.jhazmat.2011.04.067
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发表时间：
2011-07
影响因子：
13.6
通讯作者：
S. Du;J. Shentu;B. Luo;I. Shamsi;X. Y. Lin;Y. Zhang;C. Jin
中科院分区：
文献类型：
--
作者：
S. Du;J. Shentu;B. Luo;I. Shamsi;X. Y. Lin;Y. Zhang;C. Jin
湖泊或河流中的水生植物垃圾会影响水-沉积物系统中的磷通量。在本研究中，将水生植物残渣或典型植物成分(纤维素或葡萄糖)添加到具有不同初始SRP(可溶性活性磷)浓度的沉积物(50 Mg)和上覆水(2 L)系统中，以考察其影响。经过18天的4 g植物垃圾处理后，上覆水中0.5 mg和2 mg L−1在30℃下的初始SRP分别比不添加植物垃圾的处理降低了41%和53%。纤维素和葡萄糖处理的结果与植物残渣处理的结果相似。当水-沉淀物系统被灭菌时，纤维素或葡萄糖促进的SRP下降消失。此外，在非灭菌系统中，葡萄糖处理显著增加了底泥中微生物量碳和微生物量磷的含量。虽然底泥中的总磷随着葡萄糖处理的增加而增加，但其水溶态和铁伴生的无机组分--两种不稳定的磷组分--明显减少。我们的结果表明，植物残渣在水系中的短期滞留通过微生物介导的沉积物中磷的吸附和稳定机制来促进上覆水SRP的减少。
Aquatic plant debris in lakes or rivers may affect phosphorus flux in water–sediment systems. In this study, either aquatic plant debris or typical plant components (cellulose or glucose), were added into a system of sediment (50 g) and overlying water (2 L) with different initial SRP (soluble reactive phosphorus) concentrations to investigate the impact. After 18 days of treatment with 4 g of plant debris, the SRP in the overlying water for 0.5 and 2 mg L−1initial SRP tests at 30 °C decreased by 41 and 53%, respectively, compared to the treatments without plant debris. Cellulose and glucose treatments gave similar results as plant debris treatment. When the water–sediment system was sterilized, the cellulose- or glucose-facilitated decrease in SRP vanished. Additionally, in the non-sterilized system, the glucose treatment significantly increased both the microbial biomass carbon and the microbial biomass phosphorous in the sediment. Although total phosphorous in the sediment increased with glucose treatment, its water soluble and iron associated inorganic fractions, two labile phosphorus fractions, were clearly reduced. Our results suggest that the short-term retention of plant debris in water systems facilitates a decrease in overlying water SRP through microbe-mediated mechanisms of phosphorus adsorption and stabilization in sediment.